CA2675019A1 - System and method for enhancing an activated sludge process - Google Patents
System and method for enhancing an activated sludge process Download PDFInfo
- Publication number
- CA2675019A1 CA2675019A1 CA 2675019 CA2675019A CA2675019A1 CA 2675019 A1 CA2675019 A1 CA 2675019A1 CA 2675019 CA2675019 CA 2675019 CA 2675019 A CA2675019 A CA 2675019A CA 2675019 A1 CA2675019 A1 CA 2675019A1
- Authority
- CA
- Canada
- Prior art keywords
- mixed liquor
- biological flocs
- weighting agent
- subsystem
- flocs
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000010802 sludge Substances 0.000 title claims abstract description 133
- 238000000034 method Methods 0.000 title claims abstract description 114
- 230000002708 enhancing effect Effects 0.000 title claims abstract description 40
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 130
- 238000005273 aeration Methods 0.000 claims abstract description 66
- 238000005470 impregnation Methods 0.000 claims abstract description 47
- 238000011084 recovery Methods 0.000 claims abstract description 25
- 238000002347 injection Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims abstract description 13
- 239000007787 solid Substances 0.000 claims description 42
- 244000005700 microbiome Species 0.000 claims description 34
- 239000002351 wastewater Substances 0.000 claims description 34
- 229910010272 inorganic material Inorganic materials 0.000 claims description 26
- 239000011147 inorganic material Substances 0.000 claims description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 23
- 230000001965 increasing effect Effects 0.000 claims description 23
- 229910052760 oxygen Inorganic materials 0.000 claims description 23
- 239000001301 oxygen Substances 0.000 claims description 23
- 230000008719 thickening Effects 0.000 claims description 22
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 19
- 238000005054 agglomeration Methods 0.000 claims description 19
- 230000002776 aggregation Effects 0.000 claims description 19
- 229910052698 phosphorus Inorganic materials 0.000 claims description 19
- 239000011574 phosphorus Substances 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 14
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 11
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 11
- 238000010008 shearing Methods 0.000 claims description 11
- 239000000701 coagulant Substances 0.000 claims description 10
- 238000005345 coagulation Methods 0.000 claims description 10
- 230000015271 coagulation Effects 0.000 claims description 10
- 239000006148 magnetic separator Substances 0.000 claims description 10
- 238000001556 precipitation Methods 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 229910021529 ammonia Inorganic materials 0.000 claims description 7
- 229920006318 anionic polymer Polymers 0.000 claims description 6
- 125000002091 cationic group Chemical group 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 6
- 229920006317 cationic polymer Polymers 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 2
- 239000000356 contaminant Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 208000012868 Overgrowth Diseases 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- QVGXLLKOCUKJST-NJFSPNSNSA-N oxygen-18 atom Chemical compound [18O] QVGXLLKOCUKJST-NJFSPNSNSA-N 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- 230000002906 microbiologic effect Effects 0.000 description 1
- 239000010841 municipal wastewater Substances 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/12—Inert solids used as ballast for improving sedimentation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
A system for enhancing an activated sludge process that includes at least one aeration tank subsystem, a weighting agent impregnation subsystem, a fl occulant injection port located downstream from at least one aeration tank, at least one clarifier, a return activated sludge subsystem, a weighting age nt recovery subsystem, and a wasting subsystem.
Description
SYSTEM AND METHOD FOR ENHANCING AN ACTIVATED SLUDGE
PROCESS
RELATED APPLICATIONS
This application claims benefit of and priority to U.S. Provisional Application Serial No. 60/879,373, filed January 9, 2007, entitled "Process For The Biochemical Treatment Of Wastewater", and also claims benefit of and priority to U.S.
Provisional Application Serial No. 60/994,553, filed September 20, 2007, entitled "A
Process For Enhanced Biochemical Treatment Of Wastewater", both incorporated by reference herein.
FIELD OF THE INVENTION
This invention relates to a system and method for enhancing an activated sludge process.
BACKGROUND OF THE INVENTION
Municipal and industrial wastewater treatment facilities often include primary, secondary and tertiary processes to treat wastewater to remove contaminants, such as suspended solids, biodegradable organics, phosphorus, nitrogen, microbiological contaminants, and the like, to provide a clean effluent. The clean effluent is typically subject to strict local, state and federal regulations.
The primary treatment processes often includes screens, grit chambers and/or primary-clarifiers to remove large solids and other suspended matter to provide a primary effluent. Activated sludge is one type of secondary process which utilizes an aeration tank(s) which contains a large population of microorganisms that ingest contaminants in the primary effluent to form biological "flocs." Oxygen is typically fed into the aeration tank(s) to promote growth of these biological flocs. The combination of primary effluent, or in some cases raw sewage, and biological flocs is commonly known as mixed liquor. The population or concentration of microorganisms in the mixed liquor is often referred to as mixed liquor suspended solids (MLSS).
After sufficient treatment in the aeration tank(s), the biological flocs in the mixed liquor are then typically sent to a secondary clarifier where the biological flocs are separated by gravity from the mixed liquor to provide a secondary effluent and a settled sludge. The secondary effluent, or "clean" effluent, may be discharged back to the environment or processed by additional tertiary treatment processes. The majority of the settled sludge in the secondary clarifier is typically recycled back to the aeration tank(s) by a return activated sludge subsystem. The remaining, excess sludge is wasted from the system to control the concentration of mixed liquor suspended solids.
However, separation of the biological flocs from the mixed liquor in the secondary clarifier is difficult because the biological flocs are only marginally heavier than water, and therefore settle very slowly. As a result, the secondary clarifier of a typical activated sludge process is the bottleneck in most wastewater treatment processes that utilize activated sludge as a secondary process. The crucial solids separation step of the biological flocs from the mixed liquor in the secondary clarifier is therefore typically the rate limiting=process which is governed by a variety of=
factors, most notably the specific gravity, or density, of the biological flocs.
PROCESS
RELATED APPLICATIONS
This application claims benefit of and priority to U.S. Provisional Application Serial No. 60/879,373, filed January 9, 2007, entitled "Process For The Biochemical Treatment Of Wastewater", and also claims benefit of and priority to U.S.
Provisional Application Serial No. 60/994,553, filed September 20, 2007, entitled "A
Process For Enhanced Biochemical Treatment Of Wastewater", both incorporated by reference herein.
FIELD OF THE INVENTION
This invention relates to a system and method for enhancing an activated sludge process.
BACKGROUND OF THE INVENTION
Municipal and industrial wastewater treatment facilities often include primary, secondary and tertiary processes to treat wastewater to remove contaminants, such as suspended solids, biodegradable organics, phosphorus, nitrogen, microbiological contaminants, and the like, to provide a clean effluent. The clean effluent is typically subject to strict local, state and federal regulations.
The primary treatment processes often includes screens, grit chambers and/or primary-clarifiers to remove large solids and other suspended matter to provide a primary effluent. Activated sludge is one type of secondary process which utilizes an aeration tank(s) which contains a large population of microorganisms that ingest contaminants in the primary effluent to form biological "flocs." Oxygen is typically fed into the aeration tank(s) to promote growth of these biological flocs. The combination of primary effluent, or in some cases raw sewage, and biological flocs is commonly known as mixed liquor. The population or concentration of microorganisms in the mixed liquor is often referred to as mixed liquor suspended solids (MLSS).
After sufficient treatment in the aeration tank(s), the biological flocs in the mixed liquor are then typically sent to a secondary clarifier where the biological flocs are separated by gravity from the mixed liquor to provide a secondary effluent and a settled sludge. The secondary effluent, or "clean" effluent, may be discharged back to the environment or processed by additional tertiary treatment processes. The majority of the settled sludge in the secondary clarifier is typically recycled back to the aeration tank(s) by a return activated sludge subsystem. The remaining, excess sludge is wasted from the system to control the concentration of mixed liquor suspended solids.
However, separation of the biological flocs from the mixed liquor in the secondary clarifier is difficult because the biological flocs are only marginally heavier than water, and therefore settle very slowly. As a result, the secondary clarifier of a typical activated sludge process is the bottleneck in most wastewater treatment processes that utilize activated sludge as a secondary process. The crucial solids separation step of the biological flocs from the mixed liquor in the secondary clarifier is therefore typically the rate limiting=process which is governed by a variety of=
factors, most notably the specific gravity, or density, of the biological flocs.
Moreover, solids separation in the secondary clarifier in a typical activated sludge processes is oflen unreliable due to the many types of settling problems that are caused by inter alia: overgrowth of filamentous organisms, viscous bulking caused by the overgrowth of either zoogleal organisms or exocellular polysaccharide material, pin floc, straggler floc, excessive solids loading on the secondary clarifiers, excessive secondary clarifier surface overflow rate, and the like.
BRIEF SUMMARY OF THE INVENTION
It is therefore an object of this invention to provide a system and method for enhancing an activated sludge process.
It is a further object of this invention to provide such a system and method which increases the settling rate of biological flocs in a secondary clarifier.
It is a further object of this invention to provide such a system and method which eliminates problems associated with slow settling rates of biological flocs in the secondary clarifier.
It is a further object of this invention to provide such a system and method which increases the capacity of an activated sludge system It is a further object of this invention to provide such a system and method which effectively in removes contaminants from a wastewater.
It is a further object of this invention to provide such a system and method which is cost efficient.
It is a further object of this invention to provide such a system and method which is more reliable.
It is a further object of this invention to provide such a system and method which more robust.
It is a further object of this invention to provide such a system and method which enhances removal of contaminants from wastewater.
It is a further object of this invention to provide such a system and method which enhances removal of suspended solids from wastewater.
It is a further object of this invention to provide such a system and method which can increase the MLSS concentration to increase capacity.
It is a further object of this invention to provide such a system and method which can increase the wastewater flow and/or loading to increase capacity.
It is a further object of this invention to provide such a system and method which can increase the MLSS concentration to enhance nitrification of ammonia in the mixed liquor.
It is a further object of this invention to provide such a system and method which enhances removal of nitrogen from wastewater.
It is a further object of this invention to provide such a system and method which enhances removal of phosphorus from wastewater.
It is a further object of this invention to provide such a system and method which reduces the typical footprint of an activated sludge system.
It is a further object of this invention to provide such a system and method which reduces installation costs and land requirements.
It is a further object of this invention to provide such a system and method that enables the utilization of smaller aeration tanks and clarifiers.
It is a further object of this invention to provide such a system and method which may provide a high quality secondary effluent.
It is a further object of this invention to provide such a system and method in which the high quality secondary effluent may meet local, state and federal regulations for wastewater The subject invention, however, in other embodiments, need not achieve all these objectives and the claims hereof should not be limited to structures or methods capable of achieving these objectives.
This invention features a system for enhancing an activated sludge process that includes at least one aeration tank for receiving a flow of wastewater and for introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids. A weighting agent impregnation subsystem includes an impregnation tank for mixing the mixed liquor, virgin weighting agent, and recycled weighting agent to impregnate the weighting agent into biological flocs suspended in the mixed liquor to form weighted biological flocs. A flocculant injection port located downstream from the aeration tank introduces a flocculant to the mixed liquor for enhancing settling and thickening of the weighted biological flocs and provides agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with weighted biological flocs. At least one clarifier separates and collects the weighted biological flocs from the mixed liquor to provide a secondary effluent and a settled sludge. A return activated sludge subsystem recycles the majority of the settled sludge to the aeration tank. A weighting agent recovery subsystem removes and shears the remaining settled sludge and recovers the weighting agent therefrom and reintroduces the weighting agent to the weighting agent impregnation subsystem. A wasting subsystem wastes the remaining settled sludge of the weighting agent recovery subsystem to control the population of the microorganisms in the mixed liquor.
In one embodiment, the mixing tank energy of the mixing may be in the range of about 1.5 HP/1000ft3 to about 100 HP/1000 ft3. The weighting agent impregnation subsystem may include a storage subsystem for storing the virgin weighting agent and dispensing the virgin weighting agent to the mixing tank. The capacity of the activated sludge system may be increased by increasing the concentration of the mixed liquor suspended solids in the aeration tank by reducing the amount of settled sludge wasted by the wasting subsystem. The amount of the settled sludge wasted by the wasting subsystem may be reduced to increase the concentration of mixed liquor suspended solids for enhancing nitrification of ammonia in the mixed liquor.
The nitrification may be enhanced by increasing the amount of dissolved oxygen introduced into the aeration tank. The aeration tank may include at least one anoxic zone configured to remove nitrogen from the mixed liquor. The aeration tank may include at least one anaerobic zone configured to remove of phosphorus from the mixed liquor. A coagulant may be added to the aeration tank, the impregnation tank, or the flocculant injection port to remove phosphorus by precipitation and/or coagulation. The weighting agent may include magnetite. The flocculant may include a cationic and/or anionic polymer. The ratio of the weighting agent to mixed liquor may be greater than about 1:5 to 1. The weighting agent recovery subsystem may include an in-line shear mixer for separating the biological flocs from the weighting agent. The weighting agent recovery subsystem may include a single pass wet drum magnetic separator for recovering the weighting agent from the remaining settled sludge and for introducing the recovered weighting agent into the impregnation tank. The secondary effluent may have a total suspended solids concentration less than about 30 mg/L. The weighting agent impregnation subsystem may dispense the mixed liquor from the aeration tank to the impregnation tank and dispenses the weighted biological flocs back to the aeration tank. The weighting agent impregnation subsystem may be located downstream from the aeration tank and before the secondary clarifier.
This invention also features a system for enhancing an activated sludge process including at least one aeration tank for receiving a flow a wastewater and for introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids. An impregnation subsystem includes an impregnation tank for mixing the mixed liquor, virgin magnetically separable inorganic material, and recycled magnetically separable inorganic material to impregnate the magnetically separable inorganic material into biological flocs suspended in the mixed liquor to form weighted biological floes. A flocculant injection port located downstream from the aeration tank introduces a flocculant to the mixed liquor for enhancing settling and thickening of the weighted biological flocs and for providing agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with weighted biological flocs. At least one clarifier separates and collects the weighted biological flocs from the mixed liquor to provide a secondary effluent and a settled sludge. A return activated sludge subsystem recycles the majority of the settled sludge to the aeration tank. A recovery subsystem removes and shears the remaining settled sludge and recovers the magnetically separable inorganic material therefrom and reintroduces the magnetically separable inorganic material to the magnetically separable inorganic material impregnation subsystem. A wasting subsystem wastes the remaining sludge of the magnetically separable inorganic material recovery subsystem to control the population of the microorganisms in the mixed liquor.
In one embodiment, the magnetically separable inorganic material includes magnetite.
This invention further features a system for enhancing an activated sludge process that includes at least one aeration tank for receiving a flow a wastewater and for introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids. A weighting agent impregnation subsystem located downstream from the aeration tank includes an impregnation tank for mixing the mixed liquor, virgin weighting agent, and recycled weighting agent to impregnate the weighting agent into biological flocs suspended in the mixed liquor to form weighted biological flocs. A flocculant injection port located downstream from the aeration tank introduces a flocculant to the mixed liquor for enhancing settling and thickening of the weighted biological flocs and for providing agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with weighted biological flocs. At least one clarifier separates and collects the weighted biological flocs from the mixed liquor to provide a secondary effluent and a settled sludge. A
weighting agent recovery subsystem removes and shears the remaining settled sludge and recovers the weighting agent therefrom and reintroduces the weighting agent to the weighting agent impregnation subsystem. A wasting subsystem wastes the remaining sludge of the weight agent recovery subsystem to control the population of the microorganisms in the mixed liquor.
This invention also features a system for enhancing an activated sludge process that includes at least one aeration tank for receiving a flow a wastewater and for introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids. A weighting agent impregnation subsystem includes an impregnation tank for mixing the mixed liquor, virgin weighting agent, and recycled weighting agent to impregnate the weighting agent into biological flocs suspended in the mixed liquor to form weighted biological flocs. A flocculant injection port located downstream from the aeration tank introduces a flocculant to the mixed liquor for enhancing settling and thickening of the weighted biological flocs and provides agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with weighted biological flocs.
This invention further features a method for enhancing an activated sludge process, the method including the steps of: a) receiving a flow of wastewater and introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids, b) impregnating a weighting agent into the biological flocs suspended in the mixed liquor to form weighted biological flocs, c) introducing a flocculant to the mixed liquor to enhance settling and thickening of the weighted biological floes and to establish agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with the weighted biological flocs, d) separating and collecting the weighted biological flocs from the mixed liquor in at least one secondary clarifier to provide a secondary effluent and a settled sludge, e) recycling the majority of the settled sludge to step a), f) removing and shearing the remaining settled sludge and recovering the weighting agent therefrom to reintroduce the weighting agent to step b), and g) wasting the remaining settled sludge in step f) to control the population of the microorganisms in the mixed liquor.
In one embodiment, the weighting agent may be impregnated into the biological flocs in step b) by mixing the mixed liquor and the biological flocs at a predetermined energy level. The mixing energy may be in the range of about 1.5 HP/1000 ft3 to about 100 HP/1000 ft3. The capacity of the activated sludge process may be increased by increasing the concentration of the mixed liquor suspended solids in step a) by reducing the amount of the settled sludge removed in steps f) and g). The nitrification of ammonia in the mixed liquid may be enhanced by increasing the concentration of mixed liquor suspended solids by reducing the amount of the settled sludge removed in steps f) and g). The nitrification may be enhanced by increasing the amount of oxygen introduced to the mixed liquor in step a). The removal of nitrogen from the mixed liquor may be enhanced by utilizing at least one anoxic zone. The removal of the phosphorus from the settled sludge may be enhanced by utilizing at least one anaerobic zone. The method may further include the step of adding a coagulant for removing phosphorus by precipitation and/or by coagulation. The weighting agent may include magnetite. The flocculant may include a cationic and/or an anionic polymer. The ratio of the weighting agent to mixed liquor maybe greater than about 1:5 to 1. The method may further include the step of separating the weighting agent from the sheared settled sludge of step f) by utilizing a single pass wet drum magnetic separator. The secondary effluent may have a total suspended solids concentration less than about 30 mg/L.
This invention also features a method for enhancing an activated sludge process, the method including the steps of a) receiving a flow of wastewater and introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids, b) impregnating a magnetically separable inorganic material into the biological flocs suspended in the mixed liquor to form weighted biological flocs, c) introducing a flocculant to the mixed liquor to enhance settling and thickening of the weighted biological flocs and to establish agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with the weighted biological flocs, d) separating and collecting the weighted biological flocs from the mixed liquor in at least one secondary clarifier to provide a secondary effluent and a settled sludge, e) recycling the majority of the settled sludge to step a), f) removing and shearing the remaining settled sludge and recovering the magnetically separable inorganic material therefrom to reintroduce the magnetically separable inorganic material to step b), and g) wasting the remaining settled sludge in step f) to control the population of the microorganisms in the mixed liquor.
In one embodiment, the magnetically separable inorganic material may include magnetite.
This invention further features a method for enhancing an activated sludge process, the method including the steps of a) receiving a flow of wastewater and introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids, b) impregnating a weighting agent into the biological flocs suspended in the mixed liquor to form weighted biological flocs, c) introducing a flocculant to the mixed liquor to enhance settling and thickening of the weighted biological flocs and to establish agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with the weighted biological flocs, d) separating and collecting the weighted biological flocs from the mixed liquor in at least one secondary clarifier to provide a secondary effluent and a settled sludge, e) removing and shearing the remaining settled sludge and recovering the weighting agent therefrom to reintroduce the weighting agent to step b), and f) wasting the remaining settled sludge in step e) to control the population of the microorganisms in the mixed liquor.
This invention also features a method for enhancing an activated sludge process, the method including the steps of a) receiving a flow of wastewater and introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids, b) impregnating a weighting agent into the biological flocs suspended in the mixed liquor to form weighted biological flocs, and c) introducing a flocculant to the mixed liquor to enhance settling and thickening of the weighted biological flocs and to establish agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with the weighted biological flocs.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
Other objects, features and advantages will occur to those skilled in the art from the following description of a preferred embodiment and the accompanying drawings, in which:
Fig. 1 is a three-dimensional view of one embodiment of the system for enhancing an activated sludge process of this invention;
Fig. 2 is a three-dimensional view showing an example of a weighting agent impregnated in biological flocs in accordance with this invention;
Fig. 3A is a schematic side view of one embodiment of an in-line shear mixer used with the weighting agent recovery system shown in Fig. 1;
Fig. 3B is a schematic top view of the in line shear mixer shown in Fig. 3A;
Fig. 4 is a schematic block diagram of one embodiment of the aeration tank shown in Fig. 1 including an anoxic zone configured to remove nitrogen and an anaerobic zone configured to remove phosphorus;
Fig. 5 is a schematic block diagram of another embodiment of the system for enhancing an activated sludge process of this invention;
Fig. 6 is a schematic block diagram of yet another embodiment of the system for enhancing an activated sludge process of this invention; and Fig. 7 is a schematic block diagram showing the primary steps of the method for enhancing an activated sludge process of this invention.
DETAILED DESCRIPTION OF THE INVENTION
Aside from the preferred embodiment or embodiments disclosed below, this invention is capable of other embodiments and of being practiced or being carried out in various ways. Thus, it is to be understood that the invention is not limited in its application to the details of construction and the arrangements of components set forth in the following description or illustrated in the drawings. If only one embodiment is described herein, the claims hereof are not to be limited to that embodiment.
Moreover, the claims hereof are not to be read restrictively unless there is clear and convincing evidence manifesting a certain exclusion, restriction, or disclaimer.
There is shown in Fig. 1 one embodiment of system 10 for enhancing an activated sludge process of this invention. System 10 includes at least one aeration tank 12 which receives a flow of wastewater (primary effluent) 14 by line 16.
Aeration tank 12 introduces dissolved oxygen 18 from line 20 exposed to ambient air 22 to a population of microorganisms to promote growth of biological flocs 23 in mixed liquor 24 (a combination of wastewater 14 and biological flocs 23 defined by to a concentration of mixed liquor suspended solids (MLSS), e.g., about 8000 mg/L, or similar concentration of MLSS known by those skilled in the art.
System 10 also includes weighting agent impregnation subsystem 26 with impregnation tank 28 and mixer 30 which receives mixed liquor 24 from aeration tank 12 by line 32. Impregnation tank 28 also receives virgin weighting agent, indicated at 33, e.g., from feed hopper 34 by line 36, and recycled weighting agent, indicated at 38, from weight agent recovery subsystem 74 (discussed below). Weighting agent impregnation subsystem 26 mixes mixed liquor 24, the virgin weighting agent, and the recycled weighting agent in impregnation tank 28 to impregnate the weighting agent into biological flocs 23 suspended in mixed liquor 24 to form weighted biological flocs. In one embodiment, mixer 30 utilizes a mixing energy in the range of about 1.5 HP/1000 ft3 to about 100 HP/1000 ft3, e.g., about 25 HP/1000 ft3, or any similar mixing energy which is sufficient to impregnate the weighting agent into biological flocs 23 suspended in mixed liquor 24 to form weighted biological flocs.
The weighted biological flocs are then sent to aeration tank 12 by line 37. In one example, the weighting agent may be magnetite, or any similar type weighting agent or magnetically separable inorganic material known to those skilled in the art which increases the density of the biological flocs. As discussed in further detail below, increasing the density of biological flocs 23 by forming weighed biological flocs promotes rapid settling of the flocs in secondary clarifier 46. Fig. 2 shows one example of weighting agent 40 impregnated into biological flocs 23 to form weighted biological flocs 25.
System 10, Fig. 1 also includes flocculant injection port 42 located downstream from aeration tank 12 which introduces flocculant 44 into mixed liquor 24 in line 35. Flocculant 44 enhances settling and thickening of the weighted biological flocs suspended in mixed liquor 24 in secondary clarifier 46 and establishes agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with the weighted biological flocs in secondary clarifier 46.
In one example, flocculant 44 may be cationic or anionic polymer, such as Drewfloc (Ashland Chemical, New Jersey), or any similar type polymer known to those skilled in the art.
The agglomeration of non-impregnated biological flocs and/or partially impregnated flocs with the weighted biological flocs makes larger weighted biological flocs to provide for rapid settling of the weighted biological flocs in settling zone 64 of clarifier 46. Flocculant 44 also enhances settling and thickening of the weighted biological flocs in thickening zone 66 of clarifier 46 by reducing the size of, and increasing the density of, the weighted biological flocs. This creates channels between the weighted biological flocs which allow water at bottom 69 of clarifier 46 to flow towards top 71 of clarifier 46 and weighted biological flocs to flow towards bottom 69 in thickening zone 66 of secondary clarifier 46 to enhance the thickening process.
Secondary clarifier 46 separates and collects the weighted biological flocs from the mixed liquor using rake or siphon subsystem 67 to provide secondary or clean effluent 50 in line 52 and settled sludge 54 at bottom 69 of clarifier 46. Because the weighted biological flocs have a greater specific gravity than non-impregnated biological flocs, e.g., about 2.5, they settle faster in secondary clarifier 46 than non-impregnated biological flocs utilized in a typical system for an activated sludge process. Thus, secondary clarifier 46 effectively and efficiently separates the weighted biological flocs from the mixed liquor to provide secondary effluent 50. As a result, the time needed to separate weighted biological flocs from mixed liquor 24 of the system 10 is reduced when compared to a typical activated sludge process. This -increases the capacity of system 10 to process wastewater 14. Therefore, system 10 is more effective, efficient, reliable, cost effective, and robust than a typical system for an activated sludge process. Moreover, the size of clarifier 46 and/or aeration tank 12 can be reduced, allowing system 10 to treat the same quantity of wastewater in a smaller footprint. This reduces the installation costs and land requirements of system 10. Additionally, the problems associated with the separation process of the biological flocs from the mixed liquor in the secondary clarifier, as discussed in the Background Section, are alleviated.
System 10 preferably includes return activated sludge subsystem 70 which recycles the majority of settled sludge 54 in secondary clarifier 42 to aeration tank 12 by line 72 using pump 47.
System 10 ideally includes weighting agent recovery subsystem 74 which receives the remaining settled sludge not sent to aeration tank 12 by line 74 and recovers the weighting agent from the settled sludge and reintroduces the weighting agent to weighting agent impregnation subsystem 26, as indicated at 38. In one design, weighting agent recovery subsystem 74 includes in line shear mixer 78 which shears the remaining settled sludge in line 76 to separate the weighting agent in the settled sludge in line 76 from the mixed liquor. Fig. 3A shows a side-view of one example of in line shear mixer 78 which includes rotor 80 and stator 82. Shear mixer 78 is designed such that there is a close tolerance between a rotor 80 and stator 82. In operation, rotor 80 is driven at high speeds, e.g., greater than about 10,000 r.p.m., in direction 83, Fig. 3B. The result is a shearing effect which separates the weighting agent from the biological flocs in the remaining settled sludge in line 76 to facilitate recovery of the weighting agent by the weighting agent recovery subsystem 74.
Weighting agent recovery subsystem 74 may include single pass wet drum magnetic separator 80, Fig. 1, which recovers the separated weighting agent from the remaining settled sludge processed by in line shear mixer 78 and reintroduces the recovered weighting agent into weighting agent impregnation subsystem 26, as shown at 38. Further details of single pass wet drum magnetic separator 80 are also disclosed in co-pending application Serial No. 11/893,350, filed August 15, 2007, entitled "Fluidic Sealing System For a Wet Drum Magnetic Separator" by one or more of the inventors hereof, incorporated by reference herein.
System 10 also preferably includes wasting subsystem 82 which wastes the remaining settled sludge of weighting agent recovery subsystem 74, typically processed by wet drum magnetic separator 80, to control the population of the microorganisms in mixed liquor 24 in aeration tank 12.
The capacity of system 10 to process wastewater 14 may be increased by increasing the concentration of the MLSS in aeration tank 12 by reducing the amount of settled sludge wasted by wasting subsystem 82. The amount of settled sludge wasted by wasting subsystem 82 may also be reduced to increase the concentration of MLSS in aeration tank 12 to enhance nitrification of ammonia in mixed liquor 24.
The nitrification process may also be further enhanced by increasing the amount of dissolved oxygen 18 introduced to aeration tank 12 by line 20.
Aeration tank 12', Fig. 4, where like parts have been given like numbers, may include anoxic zone 84 with mixer 83 configured to remove nitrogen from mixed liquor 24. In this example, recycle line 100 connected to line 35 recycles mixed liquor 24 to anoxic zone 84, as shown by arrows 101. Aeration tank 12' may also include anaerobic zone 86 with mixer 87 configured to remove phosphorus from the mixed liquor 24 In this example, line 72 of return activated sludge subsystem recycles the settled sludge to anaerobic zone 84. Many other possible biological nutrient removal configurations may be utilized, as known to those skilled in the art.
In one embodiment, coagulant 88, Fig. 1, may be added to aeration tank 12, as shown at 90, for removing phosphorus from mixed liquor 24 by precipitation and/or coagulation, as known by those skilled in the art. In other designs, coagulant 88 may be added to flocculant injection port 42, as shown at 92, to remove phosphorus by precipitation and/or coagulation. In yet another example, coagulant 88 may be added to impregnation tank 28, as shown at 94, for removing phosphorus by precipitation and/or coagulation.
In one embodiment, the ratio of the weighting agent, e.g., magnetite or similar type materials known to those skilled in the art, to mixed liquor 24 is greater than about 1.5 to 1Ø In one example, secondary effluent 50 has a suspended solid concentration of less than about 30 mg/L, which may meet local, state, and federal guidelines for secondary effluent 50.
Although as shown above with reference to Fig. 1, system 10 includes weighting agent impregnation subsystem 26 which receives mixed liquor from aeration tank 12 by line 32 and dispenses the weighted biological flocs into aeration tank by line 37, this is not a necessary limitation of this invention. In another embodiment, weighting agent impregnation subsystem 26a, Fig. 5, where like parts have been given like numbers, receives mixed liquor 24 from aeration tank 12 by line 32 and dispenses the weighted biological flocs processed by weighting impregnation subsystem 26a by line 37 to line 35 between aeration tank 12 and secondary clarifier 12.
In another design, system 10a, Fig. 6, where like parts have been given like numbers, includes weighting agent impregnation subsystem 26b which is located between aeration tank 12 and secondary clarifier 46. In this example, wastewater 14 may be from a brewery processing system or similar type processing system which has a high concentration of biodegradable organic matter in the incoming wastewater 14. In this design, system l0a does not need return activated sludge subsystem 70 as shown in Figs. 1 and 5 because enough organisms are grown from the removal of influent organic matter to maintain a suitable population of microorganisms in the mixed liquor 24.
The method for enhancing an activated sludge process of this invention preferably comprises the steps of: receiving a flow of wastewater and introducing dissolved oxygen to a population of microorganisms to promote growth of the biological flocs in a mixed liquor defined by a concentration of a mixed liquor suspended solids, step a) 200; Fig. 7, impregnating weighting agent into the biological flocs suspended in the mixed liquor to form weighted biological flocs, step b) 202;
introducing a flocculant to the mixed liquor to enhance settling and thickening of the weighted biological flocs and to establish agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with the weighted biological flocs, step c) 204; separating and collecting the biological flocs from the mixed liquor in at least one clarifier to provide a secondary effluent and a settled sludge, step d) 206; removing and shearing the settled sludge and recovering the weighting agent therefrom to reintroduce the weighting agent to step b) 202, step f) 208; and wasting the remaining settled sludge in step f) 208 to control the population in the mixed liquor, step g) 210. The details of the operation of steps 200-210 are discussed in detail above with reference to Figs. 1-6.
In one embodiment, the method may include the step of increasing the capacity of the activated sludge process by increasing the concentration of mixed liquor suspended solids in step a) 200 by reducing the amount of settled sludge removed in step f) 208 and step g) 210. Nitrification of ammonia in the mixed liquor may be enhanced by increasing the concentration of the mixed liquor suspended solids by reducing the amount of settled sludge removed in step f) 208 and step g) 210. The nitrification may be enhanced by increasing the oxygen introduced to the mixed liquor in step a) 200. The removal of nitrogen from the mixed liquor may be enhanced by utilizing at least one anoxic zone in step a) 200. The removal of phosphorus from the settled sludge may be enhanced by utilizing at least one anaerobic zone in step a) 200.
The method of enhancing an activated sludge process may also include the step of adding a coagulant for removing phosphorus by precipitation and/or by coagulation. The method of enhancing an activated sludge process may utilize a weighting agent that includes magnetite or similar type weighting agent or magnetically separable inorganic material known by those skilled in the art.
The method may utilize a flocculant that includes a cationic and/or anionic polymer. In one example, the ratio of the weighting agent to the mixed liquor may be greater than about 1.5 to 1Ø The method of enhancing an activated sludge process may also include the step of separating the weighting agent from the sheared settled sludge of step f) 208 by utilizing a single pass wet drum magnetic separator, e.g., wet drum magnetic separator 80, Fig. 1. In one embodiment, the secondary effluent may have a total suspended solid concentration less than about 30 mg/L.
Although specific features of the invention are shown in some drawings and not in others, this is for convenience only as each feature may be combined with any or all of the other features in accordance with the invention. The words "including", "comprising", "having", and "with" as used herein are to be interpreted broadly and comprehensively and are not limited to any physical interconnection. Moreover, any embodiments disclosed in the subject application are not to be taken as the only possible embodiments. Other embodiments will occur to those skilled in the art and are within the following claims.
In addition, any amendment presented during the prosecution of the patent application for this patent is not a disclaimer of any claim element presented in the application as filed: those skilled in the art cannot reasonably be expected to draft a claim that would literally encompass all possible equivalents, many equivalents will be unforeseeable at the time of the amendment and are beyond a fair interpretation of what is to be surrendered (if anything), the rationale underlying the amendment may bear no more than a tangential relation to many equivalents, and/or there are many other reasons the applicant can not be expected to describe certain insubstantial substitutes for any claim element amended.
What is claimed is:
BRIEF SUMMARY OF THE INVENTION
It is therefore an object of this invention to provide a system and method for enhancing an activated sludge process.
It is a further object of this invention to provide such a system and method which increases the settling rate of biological flocs in a secondary clarifier.
It is a further object of this invention to provide such a system and method which eliminates problems associated with slow settling rates of biological flocs in the secondary clarifier.
It is a further object of this invention to provide such a system and method which increases the capacity of an activated sludge system It is a further object of this invention to provide such a system and method which effectively in removes contaminants from a wastewater.
It is a further object of this invention to provide such a system and method which is cost efficient.
It is a further object of this invention to provide such a system and method which is more reliable.
It is a further object of this invention to provide such a system and method which more robust.
It is a further object of this invention to provide such a system and method which enhances removal of contaminants from wastewater.
It is a further object of this invention to provide such a system and method which enhances removal of suspended solids from wastewater.
It is a further object of this invention to provide such a system and method which can increase the MLSS concentration to increase capacity.
It is a further object of this invention to provide such a system and method which can increase the wastewater flow and/or loading to increase capacity.
It is a further object of this invention to provide such a system and method which can increase the MLSS concentration to enhance nitrification of ammonia in the mixed liquor.
It is a further object of this invention to provide such a system and method which enhances removal of nitrogen from wastewater.
It is a further object of this invention to provide such a system and method which enhances removal of phosphorus from wastewater.
It is a further object of this invention to provide such a system and method which reduces the typical footprint of an activated sludge system.
It is a further object of this invention to provide such a system and method which reduces installation costs and land requirements.
It is a further object of this invention to provide such a system and method that enables the utilization of smaller aeration tanks and clarifiers.
It is a further object of this invention to provide such a system and method which may provide a high quality secondary effluent.
It is a further object of this invention to provide such a system and method in which the high quality secondary effluent may meet local, state and federal regulations for wastewater The subject invention, however, in other embodiments, need not achieve all these objectives and the claims hereof should not be limited to structures or methods capable of achieving these objectives.
This invention features a system for enhancing an activated sludge process that includes at least one aeration tank for receiving a flow of wastewater and for introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids. A weighting agent impregnation subsystem includes an impregnation tank for mixing the mixed liquor, virgin weighting agent, and recycled weighting agent to impregnate the weighting agent into biological flocs suspended in the mixed liquor to form weighted biological flocs. A flocculant injection port located downstream from the aeration tank introduces a flocculant to the mixed liquor for enhancing settling and thickening of the weighted biological flocs and provides agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with weighted biological flocs. At least one clarifier separates and collects the weighted biological flocs from the mixed liquor to provide a secondary effluent and a settled sludge. A return activated sludge subsystem recycles the majority of the settled sludge to the aeration tank. A weighting agent recovery subsystem removes and shears the remaining settled sludge and recovers the weighting agent therefrom and reintroduces the weighting agent to the weighting agent impregnation subsystem. A wasting subsystem wastes the remaining settled sludge of the weighting agent recovery subsystem to control the population of the microorganisms in the mixed liquor.
In one embodiment, the mixing tank energy of the mixing may be in the range of about 1.5 HP/1000ft3 to about 100 HP/1000 ft3. The weighting agent impregnation subsystem may include a storage subsystem for storing the virgin weighting agent and dispensing the virgin weighting agent to the mixing tank. The capacity of the activated sludge system may be increased by increasing the concentration of the mixed liquor suspended solids in the aeration tank by reducing the amount of settled sludge wasted by the wasting subsystem. The amount of the settled sludge wasted by the wasting subsystem may be reduced to increase the concentration of mixed liquor suspended solids for enhancing nitrification of ammonia in the mixed liquor.
The nitrification may be enhanced by increasing the amount of dissolved oxygen introduced into the aeration tank. The aeration tank may include at least one anoxic zone configured to remove nitrogen from the mixed liquor. The aeration tank may include at least one anaerobic zone configured to remove of phosphorus from the mixed liquor. A coagulant may be added to the aeration tank, the impregnation tank, or the flocculant injection port to remove phosphorus by precipitation and/or coagulation. The weighting agent may include magnetite. The flocculant may include a cationic and/or anionic polymer. The ratio of the weighting agent to mixed liquor may be greater than about 1:5 to 1. The weighting agent recovery subsystem may include an in-line shear mixer for separating the biological flocs from the weighting agent. The weighting agent recovery subsystem may include a single pass wet drum magnetic separator for recovering the weighting agent from the remaining settled sludge and for introducing the recovered weighting agent into the impregnation tank. The secondary effluent may have a total suspended solids concentration less than about 30 mg/L. The weighting agent impregnation subsystem may dispense the mixed liquor from the aeration tank to the impregnation tank and dispenses the weighted biological flocs back to the aeration tank. The weighting agent impregnation subsystem may be located downstream from the aeration tank and before the secondary clarifier.
This invention also features a system for enhancing an activated sludge process including at least one aeration tank for receiving a flow a wastewater and for introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids. An impregnation subsystem includes an impregnation tank for mixing the mixed liquor, virgin magnetically separable inorganic material, and recycled magnetically separable inorganic material to impregnate the magnetically separable inorganic material into biological flocs suspended in the mixed liquor to form weighted biological floes. A flocculant injection port located downstream from the aeration tank introduces a flocculant to the mixed liquor for enhancing settling and thickening of the weighted biological flocs and for providing agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with weighted biological flocs. At least one clarifier separates and collects the weighted biological flocs from the mixed liquor to provide a secondary effluent and a settled sludge. A return activated sludge subsystem recycles the majority of the settled sludge to the aeration tank. A recovery subsystem removes and shears the remaining settled sludge and recovers the magnetically separable inorganic material therefrom and reintroduces the magnetically separable inorganic material to the magnetically separable inorganic material impregnation subsystem. A wasting subsystem wastes the remaining sludge of the magnetically separable inorganic material recovery subsystem to control the population of the microorganisms in the mixed liquor.
In one embodiment, the magnetically separable inorganic material includes magnetite.
This invention further features a system for enhancing an activated sludge process that includes at least one aeration tank for receiving a flow a wastewater and for introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids. A weighting agent impregnation subsystem located downstream from the aeration tank includes an impregnation tank for mixing the mixed liquor, virgin weighting agent, and recycled weighting agent to impregnate the weighting agent into biological flocs suspended in the mixed liquor to form weighted biological flocs. A flocculant injection port located downstream from the aeration tank introduces a flocculant to the mixed liquor for enhancing settling and thickening of the weighted biological flocs and for providing agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with weighted biological flocs. At least one clarifier separates and collects the weighted biological flocs from the mixed liquor to provide a secondary effluent and a settled sludge. A
weighting agent recovery subsystem removes and shears the remaining settled sludge and recovers the weighting agent therefrom and reintroduces the weighting agent to the weighting agent impregnation subsystem. A wasting subsystem wastes the remaining sludge of the weight agent recovery subsystem to control the population of the microorganisms in the mixed liquor.
This invention also features a system for enhancing an activated sludge process that includes at least one aeration tank for receiving a flow a wastewater and for introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids. A weighting agent impregnation subsystem includes an impregnation tank for mixing the mixed liquor, virgin weighting agent, and recycled weighting agent to impregnate the weighting agent into biological flocs suspended in the mixed liquor to form weighted biological flocs. A flocculant injection port located downstream from the aeration tank introduces a flocculant to the mixed liquor for enhancing settling and thickening of the weighted biological flocs and provides agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with weighted biological flocs.
This invention further features a method for enhancing an activated sludge process, the method including the steps of: a) receiving a flow of wastewater and introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids, b) impregnating a weighting agent into the biological flocs suspended in the mixed liquor to form weighted biological flocs, c) introducing a flocculant to the mixed liquor to enhance settling and thickening of the weighted biological floes and to establish agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with the weighted biological flocs, d) separating and collecting the weighted biological flocs from the mixed liquor in at least one secondary clarifier to provide a secondary effluent and a settled sludge, e) recycling the majority of the settled sludge to step a), f) removing and shearing the remaining settled sludge and recovering the weighting agent therefrom to reintroduce the weighting agent to step b), and g) wasting the remaining settled sludge in step f) to control the population of the microorganisms in the mixed liquor.
In one embodiment, the weighting agent may be impregnated into the biological flocs in step b) by mixing the mixed liquor and the biological flocs at a predetermined energy level. The mixing energy may be in the range of about 1.5 HP/1000 ft3 to about 100 HP/1000 ft3. The capacity of the activated sludge process may be increased by increasing the concentration of the mixed liquor suspended solids in step a) by reducing the amount of the settled sludge removed in steps f) and g). The nitrification of ammonia in the mixed liquid may be enhanced by increasing the concentration of mixed liquor suspended solids by reducing the amount of the settled sludge removed in steps f) and g). The nitrification may be enhanced by increasing the amount of oxygen introduced to the mixed liquor in step a). The removal of nitrogen from the mixed liquor may be enhanced by utilizing at least one anoxic zone. The removal of the phosphorus from the settled sludge may be enhanced by utilizing at least one anaerobic zone. The method may further include the step of adding a coagulant for removing phosphorus by precipitation and/or by coagulation. The weighting agent may include magnetite. The flocculant may include a cationic and/or an anionic polymer. The ratio of the weighting agent to mixed liquor maybe greater than about 1:5 to 1. The method may further include the step of separating the weighting agent from the sheared settled sludge of step f) by utilizing a single pass wet drum magnetic separator. The secondary effluent may have a total suspended solids concentration less than about 30 mg/L.
This invention also features a method for enhancing an activated sludge process, the method including the steps of a) receiving a flow of wastewater and introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids, b) impregnating a magnetically separable inorganic material into the biological flocs suspended in the mixed liquor to form weighted biological flocs, c) introducing a flocculant to the mixed liquor to enhance settling and thickening of the weighted biological flocs and to establish agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with the weighted biological flocs, d) separating and collecting the weighted biological flocs from the mixed liquor in at least one secondary clarifier to provide a secondary effluent and a settled sludge, e) recycling the majority of the settled sludge to step a), f) removing and shearing the remaining settled sludge and recovering the magnetically separable inorganic material therefrom to reintroduce the magnetically separable inorganic material to step b), and g) wasting the remaining settled sludge in step f) to control the population of the microorganisms in the mixed liquor.
In one embodiment, the magnetically separable inorganic material may include magnetite.
This invention further features a method for enhancing an activated sludge process, the method including the steps of a) receiving a flow of wastewater and introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids, b) impregnating a weighting agent into the biological flocs suspended in the mixed liquor to form weighted biological flocs, c) introducing a flocculant to the mixed liquor to enhance settling and thickening of the weighted biological flocs and to establish agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with the weighted biological flocs, d) separating and collecting the weighted biological flocs from the mixed liquor in at least one secondary clarifier to provide a secondary effluent and a settled sludge, e) removing and shearing the remaining settled sludge and recovering the weighting agent therefrom to reintroduce the weighting agent to step b), and f) wasting the remaining settled sludge in step e) to control the population of the microorganisms in the mixed liquor.
This invention also features a method for enhancing an activated sludge process, the method including the steps of a) receiving a flow of wastewater and introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids, b) impregnating a weighting agent into the biological flocs suspended in the mixed liquor to form weighted biological flocs, and c) introducing a flocculant to the mixed liquor to enhance settling and thickening of the weighted biological flocs and to establish agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with the weighted biological flocs.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
Other objects, features and advantages will occur to those skilled in the art from the following description of a preferred embodiment and the accompanying drawings, in which:
Fig. 1 is a three-dimensional view of one embodiment of the system for enhancing an activated sludge process of this invention;
Fig. 2 is a three-dimensional view showing an example of a weighting agent impregnated in biological flocs in accordance with this invention;
Fig. 3A is a schematic side view of one embodiment of an in-line shear mixer used with the weighting agent recovery system shown in Fig. 1;
Fig. 3B is a schematic top view of the in line shear mixer shown in Fig. 3A;
Fig. 4 is a schematic block diagram of one embodiment of the aeration tank shown in Fig. 1 including an anoxic zone configured to remove nitrogen and an anaerobic zone configured to remove phosphorus;
Fig. 5 is a schematic block diagram of another embodiment of the system for enhancing an activated sludge process of this invention;
Fig. 6 is a schematic block diagram of yet another embodiment of the system for enhancing an activated sludge process of this invention; and Fig. 7 is a schematic block diagram showing the primary steps of the method for enhancing an activated sludge process of this invention.
DETAILED DESCRIPTION OF THE INVENTION
Aside from the preferred embodiment or embodiments disclosed below, this invention is capable of other embodiments and of being practiced or being carried out in various ways. Thus, it is to be understood that the invention is not limited in its application to the details of construction and the arrangements of components set forth in the following description or illustrated in the drawings. If only one embodiment is described herein, the claims hereof are not to be limited to that embodiment.
Moreover, the claims hereof are not to be read restrictively unless there is clear and convincing evidence manifesting a certain exclusion, restriction, or disclaimer.
There is shown in Fig. 1 one embodiment of system 10 for enhancing an activated sludge process of this invention. System 10 includes at least one aeration tank 12 which receives a flow of wastewater (primary effluent) 14 by line 16.
Aeration tank 12 introduces dissolved oxygen 18 from line 20 exposed to ambient air 22 to a population of microorganisms to promote growth of biological flocs 23 in mixed liquor 24 (a combination of wastewater 14 and biological flocs 23 defined by to a concentration of mixed liquor suspended solids (MLSS), e.g., about 8000 mg/L, or similar concentration of MLSS known by those skilled in the art.
System 10 also includes weighting agent impregnation subsystem 26 with impregnation tank 28 and mixer 30 which receives mixed liquor 24 from aeration tank 12 by line 32. Impregnation tank 28 also receives virgin weighting agent, indicated at 33, e.g., from feed hopper 34 by line 36, and recycled weighting agent, indicated at 38, from weight agent recovery subsystem 74 (discussed below). Weighting agent impregnation subsystem 26 mixes mixed liquor 24, the virgin weighting agent, and the recycled weighting agent in impregnation tank 28 to impregnate the weighting agent into biological flocs 23 suspended in mixed liquor 24 to form weighted biological flocs. In one embodiment, mixer 30 utilizes a mixing energy in the range of about 1.5 HP/1000 ft3 to about 100 HP/1000 ft3, e.g., about 25 HP/1000 ft3, or any similar mixing energy which is sufficient to impregnate the weighting agent into biological flocs 23 suspended in mixed liquor 24 to form weighted biological flocs.
The weighted biological flocs are then sent to aeration tank 12 by line 37. In one example, the weighting agent may be magnetite, or any similar type weighting agent or magnetically separable inorganic material known to those skilled in the art which increases the density of the biological flocs. As discussed in further detail below, increasing the density of biological flocs 23 by forming weighed biological flocs promotes rapid settling of the flocs in secondary clarifier 46. Fig. 2 shows one example of weighting agent 40 impregnated into biological flocs 23 to form weighted biological flocs 25.
System 10, Fig. 1 also includes flocculant injection port 42 located downstream from aeration tank 12 which introduces flocculant 44 into mixed liquor 24 in line 35. Flocculant 44 enhances settling and thickening of the weighted biological flocs suspended in mixed liquor 24 in secondary clarifier 46 and establishes agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with the weighted biological flocs in secondary clarifier 46.
In one example, flocculant 44 may be cationic or anionic polymer, such as Drewfloc (Ashland Chemical, New Jersey), or any similar type polymer known to those skilled in the art.
The agglomeration of non-impregnated biological flocs and/or partially impregnated flocs with the weighted biological flocs makes larger weighted biological flocs to provide for rapid settling of the weighted biological flocs in settling zone 64 of clarifier 46. Flocculant 44 also enhances settling and thickening of the weighted biological flocs in thickening zone 66 of clarifier 46 by reducing the size of, and increasing the density of, the weighted biological flocs. This creates channels between the weighted biological flocs which allow water at bottom 69 of clarifier 46 to flow towards top 71 of clarifier 46 and weighted biological flocs to flow towards bottom 69 in thickening zone 66 of secondary clarifier 46 to enhance the thickening process.
Secondary clarifier 46 separates and collects the weighted biological flocs from the mixed liquor using rake or siphon subsystem 67 to provide secondary or clean effluent 50 in line 52 and settled sludge 54 at bottom 69 of clarifier 46. Because the weighted biological flocs have a greater specific gravity than non-impregnated biological flocs, e.g., about 2.5, they settle faster in secondary clarifier 46 than non-impregnated biological flocs utilized in a typical system for an activated sludge process. Thus, secondary clarifier 46 effectively and efficiently separates the weighted biological flocs from the mixed liquor to provide secondary effluent 50. As a result, the time needed to separate weighted biological flocs from mixed liquor 24 of the system 10 is reduced when compared to a typical activated sludge process. This -increases the capacity of system 10 to process wastewater 14. Therefore, system 10 is more effective, efficient, reliable, cost effective, and robust than a typical system for an activated sludge process. Moreover, the size of clarifier 46 and/or aeration tank 12 can be reduced, allowing system 10 to treat the same quantity of wastewater in a smaller footprint. This reduces the installation costs and land requirements of system 10. Additionally, the problems associated with the separation process of the biological flocs from the mixed liquor in the secondary clarifier, as discussed in the Background Section, are alleviated.
System 10 preferably includes return activated sludge subsystem 70 which recycles the majority of settled sludge 54 in secondary clarifier 42 to aeration tank 12 by line 72 using pump 47.
System 10 ideally includes weighting agent recovery subsystem 74 which receives the remaining settled sludge not sent to aeration tank 12 by line 74 and recovers the weighting agent from the settled sludge and reintroduces the weighting agent to weighting agent impregnation subsystem 26, as indicated at 38. In one design, weighting agent recovery subsystem 74 includes in line shear mixer 78 which shears the remaining settled sludge in line 76 to separate the weighting agent in the settled sludge in line 76 from the mixed liquor. Fig. 3A shows a side-view of one example of in line shear mixer 78 which includes rotor 80 and stator 82. Shear mixer 78 is designed such that there is a close tolerance between a rotor 80 and stator 82. In operation, rotor 80 is driven at high speeds, e.g., greater than about 10,000 r.p.m., in direction 83, Fig. 3B. The result is a shearing effect which separates the weighting agent from the biological flocs in the remaining settled sludge in line 76 to facilitate recovery of the weighting agent by the weighting agent recovery subsystem 74.
Weighting agent recovery subsystem 74 may include single pass wet drum magnetic separator 80, Fig. 1, which recovers the separated weighting agent from the remaining settled sludge processed by in line shear mixer 78 and reintroduces the recovered weighting agent into weighting agent impregnation subsystem 26, as shown at 38. Further details of single pass wet drum magnetic separator 80 are also disclosed in co-pending application Serial No. 11/893,350, filed August 15, 2007, entitled "Fluidic Sealing System For a Wet Drum Magnetic Separator" by one or more of the inventors hereof, incorporated by reference herein.
System 10 also preferably includes wasting subsystem 82 which wastes the remaining settled sludge of weighting agent recovery subsystem 74, typically processed by wet drum magnetic separator 80, to control the population of the microorganisms in mixed liquor 24 in aeration tank 12.
The capacity of system 10 to process wastewater 14 may be increased by increasing the concentration of the MLSS in aeration tank 12 by reducing the amount of settled sludge wasted by wasting subsystem 82. The amount of settled sludge wasted by wasting subsystem 82 may also be reduced to increase the concentration of MLSS in aeration tank 12 to enhance nitrification of ammonia in mixed liquor 24.
The nitrification process may also be further enhanced by increasing the amount of dissolved oxygen 18 introduced to aeration tank 12 by line 20.
Aeration tank 12', Fig. 4, where like parts have been given like numbers, may include anoxic zone 84 with mixer 83 configured to remove nitrogen from mixed liquor 24. In this example, recycle line 100 connected to line 35 recycles mixed liquor 24 to anoxic zone 84, as shown by arrows 101. Aeration tank 12' may also include anaerobic zone 86 with mixer 87 configured to remove phosphorus from the mixed liquor 24 In this example, line 72 of return activated sludge subsystem recycles the settled sludge to anaerobic zone 84. Many other possible biological nutrient removal configurations may be utilized, as known to those skilled in the art.
In one embodiment, coagulant 88, Fig. 1, may be added to aeration tank 12, as shown at 90, for removing phosphorus from mixed liquor 24 by precipitation and/or coagulation, as known by those skilled in the art. In other designs, coagulant 88 may be added to flocculant injection port 42, as shown at 92, to remove phosphorus by precipitation and/or coagulation. In yet another example, coagulant 88 may be added to impregnation tank 28, as shown at 94, for removing phosphorus by precipitation and/or coagulation.
In one embodiment, the ratio of the weighting agent, e.g., magnetite or similar type materials known to those skilled in the art, to mixed liquor 24 is greater than about 1.5 to 1Ø In one example, secondary effluent 50 has a suspended solid concentration of less than about 30 mg/L, which may meet local, state, and federal guidelines for secondary effluent 50.
Although as shown above with reference to Fig. 1, system 10 includes weighting agent impregnation subsystem 26 which receives mixed liquor from aeration tank 12 by line 32 and dispenses the weighted biological flocs into aeration tank by line 37, this is not a necessary limitation of this invention. In another embodiment, weighting agent impregnation subsystem 26a, Fig. 5, where like parts have been given like numbers, receives mixed liquor 24 from aeration tank 12 by line 32 and dispenses the weighted biological flocs processed by weighting impregnation subsystem 26a by line 37 to line 35 between aeration tank 12 and secondary clarifier 12.
In another design, system 10a, Fig. 6, where like parts have been given like numbers, includes weighting agent impregnation subsystem 26b which is located between aeration tank 12 and secondary clarifier 46. In this example, wastewater 14 may be from a brewery processing system or similar type processing system which has a high concentration of biodegradable organic matter in the incoming wastewater 14. In this design, system l0a does not need return activated sludge subsystem 70 as shown in Figs. 1 and 5 because enough organisms are grown from the removal of influent organic matter to maintain a suitable population of microorganisms in the mixed liquor 24.
The method for enhancing an activated sludge process of this invention preferably comprises the steps of: receiving a flow of wastewater and introducing dissolved oxygen to a population of microorganisms to promote growth of the biological flocs in a mixed liquor defined by a concentration of a mixed liquor suspended solids, step a) 200; Fig. 7, impregnating weighting agent into the biological flocs suspended in the mixed liquor to form weighted biological flocs, step b) 202;
introducing a flocculant to the mixed liquor to enhance settling and thickening of the weighted biological flocs and to establish agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with the weighted biological flocs, step c) 204; separating and collecting the biological flocs from the mixed liquor in at least one clarifier to provide a secondary effluent and a settled sludge, step d) 206; removing and shearing the settled sludge and recovering the weighting agent therefrom to reintroduce the weighting agent to step b) 202, step f) 208; and wasting the remaining settled sludge in step f) 208 to control the population in the mixed liquor, step g) 210. The details of the operation of steps 200-210 are discussed in detail above with reference to Figs. 1-6.
In one embodiment, the method may include the step of increasing the capacity of the activated sludge process by increasing the concentration of mixed liquor suspended solids in step a) 200 by reducing the amount of settled sludge removed in step f) 208 and step g) 210. Nitrification of ammonia in the mixed liquor may be enhanced by increasing the concentration of the mixed liquor suspended solids by reducing the amount of settled sludge removed in step f) 208 and step g) 210. The nitrification may be enhanced by increasing the oxygen introduced to the mixed liquor in step a) 200. The removal of nitrogen from the mixed liquor may be enhanced by utilizing at least one anoxic zone in step a) 200. The removal of phosphorus from the settled sludge may be enhanced by utilizing at least one anaerobic zone in step a) 200.
The method of enhancing an activated sludge process may also include the step of adding a coagulant for removing phosphorus by precipitation and/or by coagulation. The method of enhancing an activated sludge process may utilize a weighting agent that includes magnetite or similar type weighting agent or magnetically separable inorganic material known by those skilled in the art.
The method may utilize a flocculant that includes a cationic and/or anionic polymer. In one example, the ratio of the weighting agent to the mixed liquor may be greater than about 1.5 to 1Ø The method of enhancing an activated sludge process may also include the step of separating the weighting agent from the sheared settled sludge of step f) 208 by utilizing a single pass wet drum magnetic separator, e.g., wet drum magnetic separator 80, Fig. 1. In one embodiment, the secondary effluent may have a total suspended solid concentration less than about 30 mg/L.
Although specific features of the invention are shown in some drawings and not in others, this is for convenience only as each feature may be combined with any or all of the other features in accordance with the invention. The words "including", "comprising", "having", and "with" as used herein are to be interpreted broadly and comprehensively and are not limited to any physical interconnection. Moreover, any embodiments disclosed in the subject application are not to be taken as the only possible embodiments. Other embodiments will occur to those skilled in the art and are within the following claims.
In addition, any amendment presented during the prosecution of the patent application for this patent is not a disclaimer of any claim element presented in the application as filed: those skilled in the art cannot reasonably be expected to draft a claim that would literally encompass all possible equivalents, many equivalents will be unforeseeable at the time of the amendment and are beyond a fair interpretation of what is to be surrendered (if anything), the rationale underlying the amendment may bear no more than a tangential relation to many equivalents, and/or there are many other reasons the applicant can not be expected to describe certain insubstantial substitutes for any claim element amended.
What is claimed is:
Claims (41)
1. A system for enhancing an activated sludge process comprising:
at least one aeration tank for receiving a flow a wastewater and for introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids;
a weighting agent impregnation subsystem including an impregnation tank for mixing the mixed liquor, virgin weighting agent, and recycled weighting agent to impregnate the weighting agent into biological flocs suspended in the mixed liquor to form weighted biological flocs;
a flocculant injection port located downstream from the aeration tank for introducing a flocculant to the mixed liquor for enhancing settling and thickening of the weighted biological flocs and for providing agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with weighted biological flocs;
at least one clarifier for separating and collecting the weighted biological flocs from the mixed liquor to provide a secondary effluent and a settled sludge;
a return activated sludge subsystem for recycling the majority of the settled sludge to the aeration tank;
a weighting agent recovery subsystem for removing and shearing the remaining settled sludge and recovering the weighting agent therefrom and reintroducing the weighting agent to the weighting agent impregnation subsystem;
and a wasting subsystem for wasting the remaining settled sludge of the weighting agent recovery subsystem to control the population of the microorganisms in the mixed liquor.
at least one aeration tank for receiving a flow a wastewater and for introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids;
a weighting agent impregnation subsystem including an impregnation tank for mixing the mixed liquor, virgin weighting agent, and recycled weighting agent to impregnate the weighting agent into biological flocs suspended in the mixed liquor to form weighted biological flocs;
a flocculant injection port located downstream from the aeration tank for introducing a flocculant to the mixed liquor for enhancing settling and thickening of the weighted biological flocs and for providing agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with weighted biological flocs;
at least one clarifier for separating and collecting the weighted biological flocs from the mixed liquor to provide a secondary effluent and a settled sludge;
a return activated sludge subsystem for recycling the majority of the settled sludge to the aeration tank;
a weighting agent recovery subsystem for removing and shearing the remaining settled sludge and recovering the weighting agent therefrom and reintroducing the weighting agent to the weighting agent impregnation subsystem;
and a wasting subsystem for wasting the remaining settled sludge of the weighting agent recovery subsystem to control the population of the microorganisms in the mixed liquor.
2. The system of claim 1 in which the mixing tank energy is in the range of about 1.5 HP/1000ft3 to about 100 HP/1000 ft3.
3. The system of claim 1 in which the weighting agent impregnation subsystem includes a storage subsystem for storing the virgin weighting agent and dispensing the virgin weighting agent to the mixing tank.
4. The system of claim 1 in which the capacity of the system is increased by increasing the concentration of the mixed liquor suspended solids in the aeration tank by reducing the amount of the settled sludge wasted by the wasting subsystem.
5. The system of claim 1 in which the amount of the settled sludge wasted by the wasting subsystem is reduced to increase the concentration of mixed liquor suspended solids for enhancing nitrification of ammonia in the mixed liquor.
6. The system of claim 5 in which the nitrification is enhanced by increasing the amount of dissolved oxygen introduced into the aeration tank.
7. The system of claim 6 in which the aeration tank includes at least one anoxic zone configured to remove nitrogen from the mixed liquor.
8. The system of claim 7 in which the aeration tank includes at least one anaerobic zone configured to remove of phosphorus from the settled sludge.
9. The system of claim 1 in which a coagulant is added to the aeration tank for removing phosphorus by precipitation and/or coagulation.
10. The system of claim 1 in which a coagulant is added to the impregnation tank for removing phosphorus by precipitation and/or coagulation.
11. The system of claim 1 in which a coagulant is added to the flocculant injection port for removing phosphorus by precipitation and/or coagulation.
12. The system of claim 1 in which the weighting agent includes magnetite.
13. The system of claim 1 in which the flocculant includes a cationic and/or anionic polymer.
14. The system of claim 1 in which the ratio of the weighting agent to mixed liquor is greater than about 1:5 to 1.
15. The system of claim 1 in which the weighting agent recovery subsystem includes an in-line shear mixer for separating the biological flocs from the weighting agent.
16. The system of claim 15 in which the weighting agent recovery subsystem includes a single pass wet drum magnetic separator for recovering the weighting agent from the remaining settled sludge and for introducing the recovered weighting agent into the impregnation tank.
17. The system of claim 1 in which the secondary effluent has a total suspended solids concentration less than about 30 mg/L.
18. The system of claim 1 in which the weighting agent impregnation subsystem dispenses the mixed liquor from the aeration tank to the impregnation tank and dispenses the weighted biological floes back to the aeration tank.
19. The system of claim 1 in which the weighting agent impregnation subsystem is located downstream from the aeration tank and before the secondary clarifier.
20. A system for enhancing an activated sludge process comprising:
at least one aeration tank for receiving a flow of wastewater and for introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids;
an impregnation subsystem including an impregnation tank for mixing the mixed liquor, virgin magnetically separable inorganic material, and recycled magnetically separable inorganic material to impregnate the magnetically separable inorganic material into biological flocs suspended in the mixed liquor to form weighted biological flocs;
a flocculant injection port located downstream from the aeration tank for introducing a flocculant to the mixed liquor for enhancing settling and thickening of the weighted biological flocs and for providing agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with weighted biological flocs;
at least one clarifier for separating and collecting the weighted biological flocs from the mixed liquor to provide a secondary effluent and a settled sludge;
a return activated sludge subsystem for recycling the majority of the settled sludge to the aeration tank;
a recovery subsystem for removing and shearing the remaining settled sludge and recovering the magnetically separable inorganic material therefrom and reintroducing the magnetically separable inorganic material to the magnetically separable inorganic material impregnation subsystem; and a wasting subsystem for wasting the remaining sludge of the magnetically separable inorganic material recovery subsystem to control the population of the microorganisms in the mixed liquor.
at least one aeration tank for receiving a flow of wastewater and for introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids;
an impregnation subsystem including an impregnation tank for mixing the mixed liquor, virgin magnetically separable inorganic material, and recycled magnetically separable inorganic material to impregnate the magnetically separable inorganic material into biological flocs suspended in the mixed liquor to form weighted biological flocs;
a flocculant injection port located downstream from the aeration tank for introducing a flocculant to the mixed liquor for enhancing settling and thickening of the weighted biological flocs and for providing agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with weighted biological flocs;
at least one clarifier for separating and collecting the weighted biological flocs from the mixed liquor to provide a secondary effluent and a settled sludge;
a return activated sludge subsystem for recycling the majority of the settled sludge to the aeration tank;
a recovery subsystem for removing and shearing the remaining settled sludge and recovering the magnetically separable inorganic material therefrom and reintroducing the magnetically separable inorganic material to the magnetically separable inorganic material impregnation subsystem; and a wasting subsystem for wasting the remaining sludge of the magnetically separable inorganic material recovery subsystem to control the population of the microorganisms in the mixed liquor.
21. The system of claim 20 in which the magnetically separable inorganic material includes magnetite.
22. A system for enhancing an activated sludge process comprising:
at least one aeration tank for receiving a flow a wastewater and for introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids;
a weighting agent impregnation subsystem located downstream from the aeration tank including an impregnation tank for mixing the mixed liquor, virgin weighting agent, and recycled weighting agent to impregnate the weighting agent into biological flocs suspended in the mixed liquor to form weighted biological flocs;
a flocculant injection port located downstream from the aeration tank for introducing a flocculant to the mixed liquor for enhancing settling and thickening of the weighted biological floes and for providing agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with weighted biological flocs;
at least one clarifier for separating and collecting the weighted biological flocs from the mixed liquor to provide a secondary effluent and a settled sludge;
a weighting agent recovery subsystem for removing and shearing the remaining settled sludge and recovering the weighting agent therefrom and reintroducing the weighting agent to the weighting agent impregnation subsystem;
and a wasting subsystem for wasting the remaining sludge of the weight agent recovery subsystem to control the population of the microorganisms in the mixed liquor.
at least one aeration tank for receiving a flow a wastewater and for introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids;
a weighting agent impregnation subsystem located downstream from the aeration tank including an impregnation tank for mixing the mixed liquor, virgin weighting agent, and recycled weighting agent to impregnate the weighting agent into biological flocs suspended in the mixed liquor to form weighted biological flocs;
a flocculant injection port located downstream from the aeration tank for introducing a flocculant to the mixed liquor for enhancing settling and thickening of the weighted biological floes and for providing agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with weighted biological flocs;
at least one clarifier for separating and collecting the weighted biological flocs from the mixed liquor to provide a secondary effluent and a settled sludge;
a weighting agent recovery subsystem for removing and shearing the remaining settled sludge and recovering the weighting agent therefrom and reintroducing the weighting agent to the weighting agent impregnation subsystem;
and a wasting subsystem for wasting the remaining sludge of the weight agent recovery subsystem to control the population of the microorganisms in the mixed liquor.
23. A system for enhancing an activated sludge process comprising:
at least one aeration tank for receiving a flow a wastewater and for introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids;
a weighting agent impregnation subsystem including an impregnation tank for mixing the mixed liquor, virgin weighting agent, and recycled weighting agent to impregnate the weighting agent into biological flocs suspended in the mixed liquor to form weighted biological flocs; and a flocculant injection port located downstream from the aeration tank for introducing a flocculant to the mixed liquor for enhancing settling and thickening of the weighted biological flocs and for providing agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with weighted biological flocs.
at least one aeration tank for receiving a flow a wastewater and for introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids;
a weighting agent impregnation subsystem including an impregnation tank for mixing the mixed liquor, virgin weighting agent, and recycled weighting agent to impregnate the weighting agent into biological flocs suspended in the mixed liquor to form weighted biological flocs; and a flocculant injection port located downstream from the aeration tank for introducing a flocculant to the mixed liquor for enhancing settling and thickening of the weighted biological flocs and for providing agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with weighted biological flocs.
24. A method for enhancing an activated sludge process, the method comprising the steps of:
a) receiving a flow of wastewater and introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids;
b) impregnating weighting agent into the biological flocs suspended in the mixed liquor to form weighted biological flocs;
c) introducing a flocculant to the mixed liquor to enhance settling and thickening of the weighted biological flocs and to establish agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with the weighted biological flocs;
d) separating and collecting the weighted biological flocs from the mixed liquor in at least one secondary clarifier to provide a secondary effluent and a settled sludge;
e) recycling the majority of the settled sludge to step a);
f) removing and shearing the remaining settled sludge and recovering the weighting agent therefrom to reintroduce the weighting agent to step b);
and g) wasting the remaining settled sludge in step f) to control the population of the microorganisms in the mixed liquor.
a) receiving a flow of wastewater and introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids;
b) impregnating weighting agent into the biological flocs suspended in the mixed liquor to form weighted biological flocs;
c) introducing a flocculant to the mixed liquor to enhance settling and thickening of the weighted biological flocs and to establish agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with the weighted biological flocs;
d) separating and collecting the weighted biological flocs from the mixed liquor in at least one secondary clarifier to provide a secondary effluent and a settled sludge;
e) recycling the majority of the settled sludge to step a);
f) removing and shearing the remaining settled sludge and recovering the weighting agent therefrom to reintroduce the weighting agent to step b);
and g) wasting the remaining settled sludge in step f) to control the population of the microorganisms in the mixed liquor.
25. The method of claim 24 in which the weighting agent is impregnated into the biological floes in step b) by mixing the mixed liquor and the biological flocs at a predetermined energy level.
26. The method of claim 25 in which the mixing energy is in the range of about 1.5 HP/1000 ft3 to about 100 HP/1000 ft3.
27. The method of claim 24 in which the capacity of the activated sludge process is increased by increasing the concentration of the mixed liquor suspended solids in step a) by reducing the amount of the settled sludge removed in steps f) and g).
28. The method of claim 24 in which nitrification of ammonia in the mixed liquid is enhanced by increasing the concentration of mixed liquor suspended solids by reducing the amount of the settled sludge removed in steps f) and g).
29. The method of claim 28 in which the nitrification is enhanced by increasing the amount of oxygen introduced to the mixed liquor in step a).
30. The method of claim 29 in which the removal of nitrogen from the mixed liquor is enhanced by utilizing at least one anoxic zone.
31. The method of claim 30 in which removal of the phosphorus from the sludge is enhanced by utilizing at least one anaerobic zone.
32. The method of claim 24 further including the step of adding a coagulant for removing phosphorus by precipitation and/or by coagulation.
33. The method of claim 24 in which the weighting agent includes magnetite.
34. The method of claim 24 in which the flocculant includes a cationic and/or an anionic polymer.
35. The method of claim 24 in which the ratio of the weighting agent to mixed liquor is greater than about 1:5 to 1.
36. The method of claim 24 further including the step of separating the weighting agent from the sheared settled sludge of step f) by utilizing a single pass wet drum magnetic separator.
37. The method of claim 24 in which the secondary effluent has a total suspended solids concentration less than about 30 mg/L.
38. A method for enhancing an activated sludge process, the method comprising the steps of:
a) receiving a flow of a wastewater and introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids;
b) impregnating a magnetically separable inorganic material into the biological flocs suspended in the mixed liquor to form weighted biological flocs;
c) introducing a flocculant to the mixed liquor to enhance settling and thickening of the weighted biological flocs and to establish agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with the weighted biological flocs;
d) separating and collecting the weighted biological flocs from the mixed liquor in at least one secondary clarifier to provide a secondary effluent and a settled sludge;
e) recycling the majority of the settled sludge to step a);
f) removing and shearing the remaining settled sludge and recovering the magnetically separable inorganic material therefrom to reintroduce the magnetically separable inorganic material to step b); and g) wasting the remaining settled sludge in step f) to control the population of the microorganisms in the mixed liquor.
a) receiving a flow of a wastewater and introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids;
b) impregnating a magnetically separable inorganic material into the biological flocs suspended in the mixed liquor to form weighted biological flocs;
c) introducing a flocculant to the mixed liquor to enhance settling and thickening of the weighted biological flocs and to establish agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with the weighted biological flocs;
d) separating and collecting the weighted biological flocs from the mixed liquor in at least one secondary clarifier to provide a secondary effluent and a settled sludge;
e) recycling the majority of the settled sludge to step a);
f) removing and shearing the remaining settled sludge and recovering the magnetically separable inorganic material therefrom to reintroduce the magnetically separable inorganic material to step b); and g) wasting the remaining settled sludge in step f) to control the population of the microorganisms in the mixed liquor.
39. The method of claim 38 in which the magnetically separable inorganic material includes magnetite.
40. A method for enhancing an activated sludge process, the method comprising the steps of:
a) receiving a flow of a wastewater and introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids;
b) impregnating a weighting agent into the biological flocs suspended in the mixed liquor to form weighted biological flocs;
c) introducing a flocculant to the mixed liquor to enhance settling and thickening of the weighted biological flocs and to establish agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with the weighted biological flocs;
d) separating and collecting the weighted biological flocs from the mixed liquor in at least one secondary clarifier to provide a secondary effluent and a settled sludge;
e) removing and shearing the remaining settled sludge and recovering the weighting agent therefrom to reintroduce the weighting agent to step b);
and f) wasting the remaining settled sludge in step e) to control the population of the microorganisms in the mixed liquor.
a) receiving a flow of a wastewater and introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids;
b) impregnating a weighting agent into the biological flocs suspended in the mixed liquor to form weighted biological flocs;
c) introducing a flocculant to the mixed liquor to enhance settling and thickening of the weighted biological flocs and to establish agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with the weighted biological flocs;
d) separating and collecting the weighted biological flocs from the mixed liquor in at least one secondary clarifier to provide a secondary effluent and a settled sludge;
e) removing and shearing the remaining settled sludge and recovering the weighting agent therefrom to reintroduce the weighting agent to step b);
and f) wasting the remaining settled sludge in step e) to control the population of the microorganisms in the mixed liquor.
41. A method for enhancing an activated sludge process, the method comprising the steps of:
a) receiving a flow of a wastewater and introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids;
b) impregnating a weighting agent into the biological flocs suspended in the mixed liquor to form weighted biological flocs; and c) introducing a flocculant to the mixed liquor to enhance settling and thickening of the weighted biological flocs and to establish agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with the weighted biological flocs.
a) receiving a flow of a wastewater and introducing dissolved oxygen to a population of microorganisms to promote growth of biological flocs in a mixed liquor defined by a concentration of mixed liquor suspended solids;
b) impregnating a weighting agent into the biological flocs suspended in the mixed liquor to form weighted biological flocs; and c) introducing a flocculant to the mixed liquor to enhance settling and thickening of the weighted biological flocs and to establish agglomeration of non-impregnated biological flocs and/or partially impregnated biological flocs with the weighted biological flocs.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US87937307P | 2007-01-09 | 2007-01-09 | |
| US60/879,373 | 2007-01-09 | ||
| US99455307P | 2007-09-20 | 2007-09-20 | |
| US60/994,553 | 2007-09-20 | ||
| PCT/US2008/000323 WO2008086010A1 (en) | 2007-01-09 | 2008-01-09 | System and method for enhancing an activated sludge process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2675019A1 true CA2675019A1 (en) | 2008-07-17 |
| CA2675019C CA2675019C (en) | 2014-08-05 |
Family
ID=39609011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2675019 Active CA2675019C (en) | 2007-01-09 | 2008-01-09 | System and method for enhancing an activated sludge process |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US7695623B2 (en) |
| EP (1) | EP2104649B1 (en) |
| JP (1) | JP2010515567A (en) |
| AU (1) | AU2008205248B2 (en) |
| BR (1) | BRPI0806315A2 (en) |
| CA (1) | CA2675019C (en) |
| ES (1) | ES2699389T3 (en) |
| MX (1) | MX2009007407A (en) |
| WO (1) | WO2008086010A1 (en) |
Families Citing this family (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101568388B (en) | 2007-01-09 | 2013-09-18 | 西门子工业公司 | A system for removing dissolved contaminants, particulate contaminants, and oil contaminants from industrial waste water |
| US20110036771A1 (en) | 2007-01-09 | 2011-02-17 | Steven Woodard | Ballasted anaerobic system and method for treating wastewater |
| US8470172B2 (en) | 2007-01-09 | 2013-06-25 | Siemens Industry, Inc. | System for enhancing a wastewater treatment process |
| US20100213123A1 (en) | 2007-01-09 | 2010-08-26 | Marston Peter G | Ballasted sequencing batch reactor system and method for treating wastewater |
| US20120202210A1 (en) * | 2007-08-20 | 2012-08-09 | Northrop Grumman Systems Corporation | Biohazard detection system with exhaust stream recycling |
| US8353641B2 (en) | 2008-02-14 | 2013-01-15 | Soane Energy, Llc | Systems and methods for removing finely dispersed particulate matter from a fluid stream |
| US8945394B2 (en) | 2009-10-27 | 2015-02-03 | Soane Energy, Llc | System, methods, processes and apparatus for removing finely dispersed particulate matter from a fluid stream |
| MX340615B (en) * | 2009-02-27 | 2016-07-18 | Soane Mining Llc | Systems, methods, processes and apparatus for removing finely dispersed particulate matter from a fluid stream. |
| CN104386816B (en) * | 2009-07-08 | 2017-06-27 | 沙特阿拉伯石油公司 | Low concentration wastewater processing system and method |
| CN102548912B (en) * | 2009-07-08 | 2015-06-17 | 沙特阿拉伯石油公司 | Wastewater treatment system and process including irradiation of primary solids |
| US20110017674A1 (en) * | 2009-07-27 | 2011-01-27 | Michael Anthony Schober | Using Magnets or Electromagnets to Move Sewage Sludge |
| US9150445B2 (en) * | 2011-08-09 | 2015-10-06 | Hsin-Ying Liu | Polyhydroxyalkanoate production during wastewater treatment |
| US10807893B2 (en) | 2011-08-09 | 2020-10-20 | Hsinying Liu | Polyhydroxyalkanoate production during wastewater treatment |
| US8845906B2 (en) * | 2011-12-23 | 2014-09-30 | Don E. Henley And Associates, Llc | Process for single system electrocoagulation, magnetic, cavitation and flocculation (EMC/F) treatment of water and wastewater |
| CN102701514B (en) * | 2012-03-20 | 2013-12-25 | 刘智晓 | Method for improving treatment efficiency of sewage plant by utilizing bypass sludge activity enhancing technology |
| US10919792B2 (en) | 2012-06-11 | 2021-02-16 | Evoqua Water Technologies Llc | Treatment using fixed film processes and ballasted settling |
| US10464832B2 (en) * | 2012-09-21 | 2019-11-05 | D.C. Water & Sewer Authority | Apparatus for water treatment using a physical separator |
| CA2881703C (en) | 2012-09-26 | 2020-12-22 | Evoqua Water Technologies Llc | System for measuring the concentration of magnetic ballast in a slurry |
| US10106446B2 (en) | 2012-10-22 | 2018-10-23 | Evoqua Water Technologies Llc | Wastewater overflow systems and methods |
| WO2014160350A1 (en) * | 2013-03-14 | 2014-10-02 | Kuehnle Agrosystems, Inc. | Improved wastewater treatment systems and methods |
| WO2014193466A1 (en) * | 2013-05-29 | 2014-12-04 | Oberon Fmr, Inc. | Wastewater treatment for the production of microbial biomass |
| JP2015085252A (en) * | 2013-10-30 | 2015-05-07 | 株式会社日立製作所 | Water treatment method and apparatus |
| US20150321937A1 (en) * | 2014-05-07 | 2015-11-12 | Veolia Water Solutions & Technologies Support | Method and system for treating wastewater in an integrated fixed film activated sludge sequencing batch reactor |
| CN109311711B (en) | 2016-06-06 | 2022-06-24 | 懿华水处理技术有限责任公司 | Removal of heavy metals in ballasting processes |
| CA3070771A1 (en) * | 2017-08-18 | 2019-02-21 | Evoqua Water Technologies Llc | Treatment of liquid streams containing high concentrations of solids using ballasted clarification |
| CN115353183B (en) * | 2022-08-29 | 2023-08-08 | 淄博市临淄恒兴化工厂有限公司 | Flocculant for sewage treatment and preparation method thereof |
Family Cites Families (107)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US531183A (en) * | 1894-12-18 | harris | ||
| US438579A (en) * | 1890-10-14 | And samuel g | ||
| US653010A (en) * | 1899-12-20 | 1900-07-03 | Charles Herschel Koyl | Apparatus for purifying water. |
| US2065123A (en) * | 1933-11-20 | 1936-12-22 | Pacific Flush Tank Co | Sewage treatment |
| US2129267A (en) * | 1935-02-28 | 1938-09-06 | Dorr Co Inc | Sewage treatment |
| US2232294A (en) * | 1938-07-08 | 1941-02-18 | Charles H Lewis | Process for treating liquids |
| US2232296A (en) * | 1938-07-18 | 1941-02-18 | Charles H Lewis | Process for treating liquids |
| US2391494A (en) * | 1939-12-13 | 1945-12-25 | American Well Works | Method and apparatus for treating sewage |
| US2401924A (en) * | 1940-07-24 | 1946-06-11 | Permutit Co | Removal of silica from water |
| US2268461A (en) * | 1940-11-06 | 1941-12-30 | Jeffrey Mfg Co | Apparatus for producing flocculation |
| US2359748A (en) * | 1942-04-23 | 1944-10-10 | Dorr Co | Treatment of water softening sludge |
| LU29833A1 (en) * | 1945-10-06 | |||
| US2713028A (en) * | 1951-04-20 | 1955-07-12 | Jenks Harry Neville | Sewage treatment |
| US2825464A (en) * | 1954-01-22 | 1958-03-04 | Packard Water Conditioners Inc | Water treatment device |
| US3142638A (en) * | 1962-06-29 | 1964-07-28 | Blaisdell Donald Stapf | Process for separating solids from sewage |
| US3228878A (en) * | 1963-05-06 | 1966-01-11 | Howard S O Neal | Method and apparatus for treatment of flowing liquids to control deposition of solid matter therefrom |
| FR1411792A (en) | 1964-08-04 | 1965-09-24 | Nikex Nehezipari Kulkere | Process for clarifying and purifying surface water and industrial water containing suspended matter |
| US3350302A (en) * | 1964-09-16 | 1967-10-31 | Nikex Nehezipari Kulkere | Clarification of surface waters |
| US3697420A (en) * | 1968-03-19 | 1972-10-10 | Donald Stapf Blaisdell | Method and apparatus for treatment of aqueous liquor |
| US3575852A (en) * | 1969-06-06 | 1971-04-20 | American Colloid Co | Method for treating waste water containing dissolved phosphates |
| US3617561A (en) * | 1969-07-01 | 1971-11-02 | Engelhard Min & Chem | Method for clarifying liquids |
| US3676337A (en) * | 1970-07-09 | 1972-07-11 | Massachusetts Inst Technology | Process for magnetic separation |
| CH529587A (en) * | 1970-10-22 | 1972-10-31 | Von Roll Ag | Device for the production of blocks |
| DE7138603U (en) * | 1971-10-12 | 1972-06-15 | Passavant Werke | Device for mechanical-chemical water treatment and wastewater treatment |
| BE791202A (en) * | 1971-11-12 | 1973-03-01 | Gustavsbergs Fabriker Ab | LAMELLAR SEPARATOR |
| US3983033A (en) * | 1973-03-26 | 1976-09-28 | Massachusetts Institute Of Technology | Process for removing dissolved phosphorus from water magnetically |
| US3951807A (en) * | 1973-09-20 | 1976-04-20 | Sanderson Charles H | Water conditioning apparatus |
| US4151090A (en) * | 1974-05-30 | 1979-04-24 | Brigante Miguel F | Unitary package for water treatment for attachment to home hot water heater |
| US3959133A (en) * | 1974-09-11 | 1976-05-25 | Metcalf & Eddy, Inc. | Alum recovery and waste disposal in water treatment |
| JPS51142860A (en) * | 1975-04-30 | 1976-12-08 | Dowa Mining Co Ltd | Method for oxidation treatment of fe2+ in waste liquor |
| US3977966A (en) * | 1975-09-24 | 1976-08-31 | Sterling Drug Inc. | Purification of non-biodegradable industrial wastewaters |
| US4089779A (en) * | 1975-11-24 | 1978-05-16 | Georgia-Pacific Corporation | Clarification process |
| US4193866A (en) * | 1976-09-27 | 1980-03-18 | General Electric Company | Ferrite flocculating system |
| AT346252B (en) * | 1976-11-23 | 1978-11-10 | Mach Guido | PROCESS FOR DESALINATING WATER AND DEVICE FOR CARRYING OUT THE PROCESS |
| CH615597A5 (en) | 1977-01-26 | 1980-02-15 | Sulzer Ag | Process and apparatus for settling settleable particles contained in liquids |
| US4153559A (en) * | 1977-05-20 | 1979-05-08 | Sanderson Charles H | Water treatment device and method for manufacturing same |
| US4274968A (en) * | 1977-06-15 | 1981-06-23 | Standard Oil Company (Indiana) | Process for the purification of water |
| US4190539A (en) * | 1978-08-16 | 1980-02-26 | Ferdinand Besik | Apparatus for on-site renovation of sanitary waters |
| US4320012A (en) * | 1979-01-22 | 1982-03-16 | Palm Gordon F | Neutralization of phosphoric acid waste waters |
| US4388195A (en) * | 1979-07-05 | 1983-06-14 | Passavant-Werke Michelbacher Hutte | Process and apparatus for the chemical-mechanical treatment and purification of ground waters, surface waters and effluents |
| FR2460895A1 (en) * | 1979-07-13 | 1981-01-30 | Nippon Kokan Kk | SCALING TREATMENT AGENT AND ITS APPLICATION TO THE REMOVAL OF DISSOLVED HEAVY METALS |
| US4357237A (en) * | 1979-11-28 | 1982-11-02 | Sanderson Charles H | Device for the magnetic treatment of water and liquid and gaseous fuels |
| US4402833A (en) * | 1979-12-13 | 1983-09-06 | Occidental Chemical Corporation | Waste water treatment system for elemental phosphorous removal |
| CA1181653A (en) * | 1981-03-24 | 1985-01-29 | Alban Timmons | Process and composition for conditioning an aqueous system |
| AU554857B2 (en) * | 1981-04-06 | 1986-09-04 | Commonwealth Scientific And Industrial Research Organisation | Water clarification |
| US4465597B2 (en) * | 1981-08-10 | 1997-07-01 | Tetra Tech | Treatment of industrial wastewaters |
| JPS5852718B2 (en) * | 1981-12-01 | 1983-11-24 | 清進産業株式会社 | Method and device for separating suspended matter in wastewater treatment |
| JPS58133804A (en) | 1982-02-01 | 1983-08-09 | ユニオン・カ−バイド・コ−ポレ−シヨン | Control of transfer of aluminum traversing dialytic membrane |
| FR2553082B1 (en) * | 1983-10-07 | 1987-08-28 | Degremont | APPARATUS FOR TREATING WATER BY PRECIPITATION, SEPARATION, THICKENING AND RECIRCULATION OF FORMED SLUDGE |
| GB8409410D0 (en) * | 1984-04-11 | 1984-05-23 | Hydro Int Ltd | Water treatment |
| US4654139A (en) * | 1984-06-08 | 1987-03-31 | Hitachi, Ltd. | Flocculation basin in water treatment process |
| US4765908A (en) * | 1985-02-04 | 1988-08-23 | Barbara Monick | Process and composition for removing contaminants from wastewater |
| DE3526183A1 (en) * | 1985-07-23 | 1987-02-05 | Bayer Ag | METHOD FOR IMPROVED SEPARATION OF THE CLEANING LIQUID FROM THE BIOMASS IN BIOLOGICAL WASTE WATER TREATMENT |
| US4689154A (en) * | 1985-11-15 | 1987-08-25 | Occidental Chemical Corporation | Process for removing phosphorus from industrial waste water |
| WO1988001985A1 (en) * | 1986-09-16 | 1988-03-24 | Commonwealth Scientific And Industrial Research Or | Sewage treatment |
| US4765900A (en) * | 1987-02-13 | 1988-08-23 | Vertech Treatment Systems, Inc. | Process for the treatment of waste |
| US4872993A (en) * | 1988-02-24 | 1989-10-10 | Harrison George C | Waste treatment |
| FR2627704B1 (en) * | 1988-02-25 | 1991-12-13 | Ile France Syndicat Eaux | METHOD AND PLANT FOR TREATMENT OF WATER BY DECANTATION USING FINE SAND |
| US5369072A (en) * | 1988-05-10 | 1994-11-29 | University Of Washington | Granular media for removing contaminants from water and methods for making the same |
| US5023012A (en) * | 1988-10-04 | 1991-06-11 | Pieter Walter William Buchan | Purification of water |
| FR2643065B1 (en) * | 1989-02-14 | 1991-06-14 | Omnium Traitement Valorisa | METHOD AND INSTALLATION FOR BIOLOGICAL TREATMENT, INCLUDING NITRIFICATION AND DENITRATION, OF WASTE WATER TO BE TREATED |
| US4940550A (en) * | 1989-05-02 | 1990-07-10 | The Curators Of The University Of Missouri | Multi-step process for concentrating magnetic particles in waste sludges |
| IL91014A (en) * | 1989-07-17 | 1994-01-25 | Lin Israel J | Magnetic treatment of water used for agricultural purpose |
| CA2019185C (en) * | 1990-06-18 | 1996-10-22 | L. Claude Hebert | Treatment of liquids using magnetics |
| US5064531A (en) * | 1990-07-26 | 1991-11-12 | Int'l Environmental Systems, Inc. | Water filtration apparatus |
| US5266200A (en) * | 1991-04-17 | 1993-11-30 | Reid John H | Sequence continuous reaction in complete mix activated sludge systems |
| US5234603A (en) * | 1991-06-04 | 1993-08-10 | Analytical Development Corporation | Methods employing a zirconium salt for use in wastewater treatment |
| GB9115018D0 (en) * | 1991-07-11 | 1991-08-28 | Bradtec Ltd | Purification of solutions |
| US5112494A (en) * | 1991-09-03 | 1992-05-12 | Mobil Oil Corporation | Removal of cyanide from water |
| US5395527A (en) * | 1993-07-01 | 1995-03-07 | Eco Equipement Fep Inc. | Process and apparatus for treating wastewater in a dynamic, bio sequenced manner |
| US5443719A (en) * | 1994-02-23 | 1995-08-22 | Aqua-Ion Systems, Inc. | System and reactor for mixing coagulating agents into a contaminated water flow, and for removing contaminants therefrom |
| JPH07299495A (en) * | 1994-03-09 | 1995-11-14 | Meidensha Corp | Nitrification accelerating method for activated sludge circulation modulating method and method for predicting nitrification rate |
| US5840195A (en) * | 1995-05-01 | 1998-11-24 | Omnium De Traitement Et De Valorisation | Method and installation for treating an untreated flow by simple sedimentation after ballasting with fine sand |
| FR2719234B1 (en) * | 1994-05-02 | 1999-08-13 | Omnium Traitement Valorisa | Method and installation for treating a raw flow by simple decantation after ballasting with fine sand. |
| FR2719235B1 (en) * | 1994-05-02 | 1996-07-19 | Omnium Traitement Valorisa | Process and installation for clarifying biological sludge by decantation. |
| US5597479A (en) * | 1995-01-25 | 1997-01-28 | Aqua-Ion Systems, Inc. | Electro-coalescence/magnetic separation (ECMS) system and components for removal of contaminants from water streams, including desalinization |
| US5560493A (en) * | 1995-03-14 | 1996-10-01 | Pacific Electric Motor Company | Diffuser for a magnetic separator |
| JPH08257583A (en) * | 1995-03-23 | 1996-10-08 | Kurita Water Ind Ltd | Waste water treatment apparatus |
| US5779908A (en) * | 1995-07-19 | 1998-07-14 | Sorin, Inc. | Method and apparatus for waste water treatment |
| FR2751320B1 (en) * | 1996-07-18 | 1998-09-18 | Omnium Traitement Valorisa | FLUIDIZED BED WATER TREATMENT PLANT AND PHYSICO-CHEMICAL DECANTATION AND METHODS FOR IMPLEMENTING SUCH A PLANT |
| US5800717A (en) * | 1996-10-02 | 1998-09-01 | Microsep International Corporation | Water and wastewater treatment system with internal recirculation |
| FR2758812B1 (en) * | 1997-01-27 | 1999-07-09 | Degremont | PROCESS FOR THE PHYSICO-CHEMICAL TREATMENT OF EFFLUENTS, IN PARTICULAR SURFACE WATER INTENDED FOR CONSUMPTION |
| JP3691650B2 (en) * | 1997-12-11 | 2005-09-07 | 株式会社日立製作所 | Water treatment method and control device |
| US6099738A (en) * | 1997-12-17 | 2000-08-08 | Micromag Corporation | Method and system for removing solutes from a fluid using magnetically conditioned coagulation |
| FR2787781B1 (en) * | 1998-12-29 | 2001-03-23 | Amenagement Urbain & Rural | WATER TREATMENT WITH INJECTED BALLAST |
| JP3575312B2 (en) * | 1999-02-10 | 2004-10-13 | 栗田工業株式会社 | Organic wastewater treatment method |
| US6228269B1 (en) * | 1999-10-19 | 2001-05-08 | Steven Cort | Methods for treating wastewater containing hard-to-filter solids, in particular photoresist and paint sludges |
| JP2001170404A (en) * | 1999-12-15 | 2001-06-26 | Hitachi Ltd | Magnetic separator |
| US6896815B2 (en) * | 2001-05-30 | 2005-05-24 | Steven L. Cort | Methods for removing heavy metals from water using chemical precipitation and field separation methods |
| US7255793B2 (en) * | 2001-05-30 | 2007-08-14 | Cort Steven L | Methods for removing heavy metals from water using chemical precipitation and field separation methods |
| US6960294B2 (en) * | 2001-06-12 | 2005-11-01 | Hydrotreat, Inc. | Apparatus for the separation of solids from liquids by dissolved gas floatation |
| JP3773169B2 (en) * | 2001-06-29 | 2006-05-10 | 株式会社荏原製作所 | High speed biological treatment method and apparatus for organic wastewater |
| US7153431B2 (en) * | 2005-03-22 | 2006-12-26 | I. Kruger Inc. | Method and system for utilizing activated sludge in a ballasted flocculation process to remove BOD and suspended solids |
| US20070039894A1 (en) | 2005-08-17 | 2007-02-22 | Cort Steven L | Water treatment using magnetic and other field separation technologies |
| WO2008039936A2 (en) | 2006-09-27 | 2008-04-03 | Cort Steven L | Magnetic seeding and separation technology for treating water |
| US20080073282A1 (en) * | 2006-09-27 | 2008-03-27 | Cort Steven L | Device and Methods for Shearing Magnetic Floc in a Water Treatment System |
| US7820053B2 (en) * | 2006-09-27 | 2010-10-26 | Cort Steven L | Magnetic separation and seeding to improve ballasted clarification of water |
| US20080073280A1 (en) * | 2006-09-27 | 2008-03-27 | Cort Steven L | Device for Removing Magnetic Floc from a Magnetic Collector in a Water Treatment System |
| US20080073283A1 (en) * | 2006-09-27 | 2008-03-27 | Cort Steven L | Magnetic Separator for Water Treatment System |
| US20080073281A1 (en) * | 2006-09-27 | 2008-03-27 | Cort Steven L | Method and Apparatus for Batch Treating Water Utilizing Magnetic Separation |
| US7625490B2 (en) * | 2006-09-27 | 2009-12-01 | Cort Steven L | Use of a magnetic separator to biologically clean water |
| US20080073284A1 (en) * | 2006-09-27 | 2008-03-27 | Cort Steven L | Device and method for utilizing magnetic seeding and separation in a water treatment system |
| US7686960B2 (en) * | 2006-09-27 | 2010-03-30 | Cort Steven L | Multistage process for treating water utilizing in one stage magnetic seed to sorb dissolved contaminants, and in another stage utilizing magnetic seed to clarify the water |
| US20080073279A1 (en) * | 2006-09-27 | 2008-03-27 | Cort Steven L | High Rate Clarification of Cooling Water Using Magnetite Seeding and Separation |
| US7691269B2 (en) * | 2006-09-27 | 2010-04-06 | Cort Steven L | Method and system for retrofitting an existing water treatment system |
| US20080164183A1 (en) * | 2007-01-09 | 2008-07-10 | Marston Peter G | Collection system for a wet drum magnetic separator |
| CN101568388B (en) * | 2007-01-09 | 2013-09-18 | 西门子工业公司 | A system for removing dissolved contaminants, particulate contaminants, and oil contaminants from industrial waste water |
-
2008
- 2008-01-09 EP EP08724459.6A patent/EP2104649B1/en active Active
- 2008-01-09 CA CA 2675019 patent/CA2675019C/en active Active
- 2008-01-09 BR BRPI0806315-0A patent/BRPI0806315A2/en not_active IP Right Cessation
- 2008-01-09 ES ES08724459T patent/ES2699389T3/en active Active
- 2008-01-09 MX MX2009007407A patent/MX2009007407A/en active IP Right Grant
- 2008-01-09 WO PCT/US2008/000323 patent/WO2008086010A1/en active Application Filing
- 2008-01-09 US US12/008,216 patent/US7695623B2/en active Active
- 2008-01-09 JP JP2009545592A patent/JP2010515567A/en active Pending
- 2008-01-09 AU AU2008205248A patent/AU2008205248B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP2104649A1 (en) | 2009-09-30 |
| EP2104649A4 (en) | 2012-07-18 |
| US7695623B2 (en) | 2010-04-13 |
| US20080203015A1 (en) | 2008-08-28 |
| EP2104649B1 (en) | 2018-09-19 |
| JP2010515567A (en) | 2010-05-13 |
| AU2008205248A1 (en) | 2008-07-17 |
| ES2699389T3 (en) | 2019-02-11 |
| AU2008205248B2 (en) | 2010-07-01 |
| MX2009007407A (en) | 2009-11-02 |
| CA2675019C (en) | 2014-08-05 |
| WO2008086010A1 (en) | 2008-07-17 |
| BRPI0806315A2 (en) | 2011-09-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2008205248B2 (en) | System and method for enhancing an activated sludge process | |
| CN101568493B (en) | System and method for enhancing an activated sludge process | |
| EP2475623B1 (en) | System and method for wastewater treatment | |
| CA2322696C (en) | Surge anoxic mix sequencing batch reactor systems | |
| US20070119763A1 (en) | Floating sequencing batch reactor and method for wastewater treatment | |
| KR100906395B1 (en) | High Efficient Piggery Wastewater Treatment Apparatus for Treating Piggery Wastewater and Method Thereof | |
| AU2015256436B2 (en) | Method and system for treating wastewater in an integrated fixed film activated sludge sequencing batch reactor | |
| JP2021107082A (en) | Reduction of substances in contaminated fluid using naturally occurring biological growth media | |
| EP3148943B1 (en) | Method for clarification of wastewater | |
| CN111032177B (en) | Treatment of liquid streams containing high concentrations of solids using ballasted clarification | |
| JP5270247B2 (en) | Wastewater treatment facility at food processing plant | |
| Ødegaard et al. | High rate biological/chemical treatment based on the moving bed biofilm process combined with coagulation | |
| Wang et al. | Independent Physicochemical Wastewater Treatment System Consisting of Primary Flotation Clarification, Secondary Flotation Clarification, and Tertiary Treatment | |
| US20060266704A1 (en) | Biological filtration module for use within a wastewater treatment system | |
| CA2221407A1 (en) | Aerobic bioreactor for treating aqueous wastes at high organic and solids loadings | |
| MXPA98006397A (en) | Equalization basin-reactor system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |