WO2001056681A1 - Cleaning device for waste water - Google Patents

Cleaning device for waste water Download PDF

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Publication number
WO2001056681A1
WO2001056681A1 PCT/NO2000/000032 NO0000032W WO0156681A1 WO 2001056681 A1 WO2001056681 A1 WO 2001056681A1 NO 0000032 W NO0000032 W NO 0000032W WO 0156681 A1 WO0156681 A1 WO 0156681A1
Authority
WO
WIPO (PCT)
Prior art keywords
belt
filtering
filtering belt
waste water
cleaning
Prior art date
Application number
PCT/NO2000/000032
Other languages
French (fr)
Inventor
Audun Fosseng
Original Assignee
Salsnes Filter As
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=19904194&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2001056681(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to DE60038745T priority Critical patent/DE60038745T2/en
Priority to DK00904145T priority patent/DK1251929T3/en
Priority to CNB008187800A priority patent/CN1177639C/en
Priority to PCT/NO2000/000032 priority patent/WO2001056681A1/en
Priority to AU25815/00A priority patent/AU777350B2/en
Application filed by Salsnes Filter As filed Critical Salsnes Filter As
Priority to EP00904145A priority patent/EP1251929B1/en
Priority to ES00904145T priority patent/ES2304941T3/en
Priority to MXPA02007450A priority patent/MXPA02007450A/en
Priority to AT00904145T priority patent/ATE393659T1/en
Priority to CA2398067A priority patent/CA2398067C/en
Priority to PT00904145T priority patent/PT1251929E/en
Priority to US10/182,971 priority patent/US6942786B1/en
Publication of WO2001056681A1 publication Critical patent/WO2001056681A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/04—Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are impervious for filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/056—Construction of filtering bands or supporting belts, e.g. devices for centering, mounting or sealing the filtering bands or the supporting belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/44—Regenerating the filter material in the filter
    • B01D33/48—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D33/50—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
    • B01D33/72—Filters with filtering elements which move during the filtering operation having feed or discharge devices for feeding
    • B01D33/722—Filters with filtering elements which move during the filtering operation having feed or discharge devices for feeding containing fixed liquid displacement elements or cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/80—Accessories
    • B01D33/804—Accessories integrally combined with devices for controlling the filtration
    • B01D33/807—Accessories integrally combined with devices for controlling the filtration by level measuring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/34—Seals or gaskets for filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/48—Overflow systems

Definitions

  • the invention is related to a waste water cleaning device in accordance with the introductory part of patent claim 1 and a blowoff device for blowing air or another gas towards a mesh shaped cleaning belt arranged within such a cleaning device, thus removing contamination from the cleaning belt.
  • Cleaning devices having endless filtering belts are subjected to deposit of certain types of filtering residues resulting in clogging of the band or belt, such as filtering residues in municipal waste water and starch residues in waste water from potato refinement plants.
  • US Patent 2 885 080 discloses cleaning of the filtering band with a water jet from the upper side.
  • heating of the water to increase the cleaning efficiency is energy demanding and the water supply involves increased separation need, particularly when water is the primary cleaning medium for the filter band thus requiring substantial supply.
  • NO Patent 165 826 discloses a device that uses air blow from the underside of the filtering band to lift water and particles from the band and direct the water back to the band. Nor this device is capable of giving any satisfactory operation of the cleaning plants of interest, i.e., cleaning of municipal waste water.
  • WO A87/02595 (Ericksson) describes blowing pressurized air or water from above towards a filtering belt and collecting the filtrate in a collecting chute. This form of filtrate removal has not been effective. Air blowing in this way is at best suitable for removal of dry filtrate not containing fat or similar compounds.
  • NO Patent 178608 describes a cleaning device having an endless filtering belt carried through a waste water container for filtering of waste water, wherein the filtering band is carried over numerous rollers in such a way that it, in a certain area runs substantially horisontally with the filtrate turned downwards. Within this area there is a rod shaped exhaust or blowoff device to effect an air blow towards the filtering belt. A blowoff device is arranged in parallel with the blowoff device and downstream to spray water jets towards the filtering band.
  • This cleaning device has several weaknesses with regard to the cooperation between its separate modules. An example of the latter is the blowoff device which has a particularly high energy demand to achieve satisfactory tearing-off effect. Moreover, the device has been subject to clogging because of particles moved into the blowing aperture.
  • the main object of the invention is therefore to improve the cleaning device disclosed in NO Patent 178608.
  • Another object of the invention is to increase the cleaning throughput and cleaining efficiency. In that connection it is important to effect proper water removal from the filter mesh, irrespective of the quantity of waste water supplied and of the solid content of the waste water. With regard to the filter mesh, it is important to guide the mesh in such a way that the speed can be varied without effecting any substantial wear.
  • an object of the invention is to improve guidance and treatment of the filter mesh to ensure a long service life at varying speeds.
  • a particular object of the invention is to provide a blowoff device having improved efficiency with regard to the disengagement efficiency in order to remove deposits having a low solid content from the filter mesh. Another object is to obtain a high blowing air speed to decrease the energy demand and obtain effective cleaning in a larger mesh area, in order to prevent fat deposits, among others. Another object is to provide a blowing device which is less subject to clogging.
  • the cleaning device can be improved by the novel features recited in claim 1.
  • Other favourable features of the invention appears from claims 2-.? .
  • the essential features of the invention establish a low water content within the deposits guided from the filter mesh to the screw conveyor.
  • the screw conveyor will then be able to perform an effective pressing of the solids to further decrease the water portion, which again decreases the handling problems with the residue waste.
  • the construction of the blowing device also contributes to increase the cleaning efficiency.
  • the increased cleaning efficiency is caused by the construction providing an advantageous combination of increased air speed and increased air jet width, which is effective to the cleaning belt.
  • the novel construction provides an increased air blow speed when it leaves the blowing device and passes through the filter mesh. This is particularly the case when the air blow pressure is at least 0.8 bar.
  • the air slot is substantially wider in the section contacting the cleaning belt, i.e., the filter mesh.
  • the filter mesh is moving there is a risk for particle movement into the air slot.
  • Figure 1 illustrates a schematic side view of a blowing device in accordance with the invention for use with a cleaning device illustrated in Figure 3 and 4,
  • Figure 2 illustrates a cross section through the center part of the blowing device of Figure 1
  • Figure 3 illustrates a side view of a cleaning device in accordance with the invention, wherein the blowing device of Figure- ⁇ 2 is attached
  • Figure 4 illustrates a partially sectioned end view of the eject end of the cleaning device of Figure 3 and, Figure 5 illustrates a cross section through the guiding or clamping rails of the filter mesh edge.
  • Fig. 1 illustrates a rod shaped blowing device 11 provided with brackets 12 and 13 at each end thereof to facilitate mounting within a plant (not shown), e.g., beneath and upto a cleaning belt 14 for waste water (Fig. 2).
  • the cleaning belt 14 may be comprised of a filter mesh extending through an accept zone (not illustrated), e.g., for waste water, and further extending, having its rear side facing upwards, past the underlying blowing device 11, wherein deposits possibly containing fat are to be removed.
  • the blowing device 11 comprises a supply pipe 15, such as a rectangular pipe provided with a series of holes at its top side, connected to a pressurised air source (not illustrated). At one end of said pipe there is attached a pipe shaped angle piece 16. A nozzle rod 17 is arranged over the supply pipe 15, for example a polymer pipe, as illustrated in further detail in cross section in Figure 2 and which constitutes a substantial part of the present invention.
  • Figure 2 illustrates how the nozzle rod 17 comprises an elongate inlet chamber 18 which receives compressed air from the adjacent elongate supply pipe 15.
  • the nozzle rod 17 can, for example, be screwed into the supply pipe 15 with a series of holes 19 in the resting surface towards the inlet chamber.
  • the inlet chamber can exhibit a width of 8 mm, and a bottom converging with an opening angle of 120 degrees and forming an inlet manifold to a series of holes extending through the nozzle rod, e.g., having a diameter of 2.5 mm, a length of 1-10 mm and a centre distance of 4 mm.
  • the series of holes 18 open into an elongate outlet slit 20 having a width at the outlet of about 1 : 5 of the hole diameter and having a depth of about 5 times the narrowest width.
  • the outlet slit 21 expands like a trumpet towards the outlet, i.e., having a diverging course from a short inlet section 21 A having parallel walls, an intermediate section 21B having walls forming an opening angle of about 20 degrees, to an outlet section 21 C having a rounded transition to an outer edge 2 ID.
  • This construction will establish a modified flow regime at the decompression and the transition from the outlet slit 21 to the cleaning belt.
  • the air speed at the slit outlet 21C will increase, which again increases the volume of the air flowing up to the cleaning belt. Accordingly, a stronger air flow is established, both with regard to intensity and size, as stated above.
  • the rod In order to stabilise the nozzle rod 17 mechanically in relation to the supply pipe 15, the rod is provided with a groove 22, in the region at the inlet slit 18, forming elongate side flanges 21 and 24 being engaged with the supply pipe.
  • FIGS. 3 and 4 show a cleaning device in accordance with the invention having an endless filtering belt 31 guided over a lower turn roller 21 , inclined upwards through a waste water container 33 to a first upper turn roller 34 and over a horizontal section 35 to a second upper turn roller 36 guiding the belt back below the horizontal section 35 to an underlying turn roller 37 below the first upper turn roller 34. From this position the filtering belt 31 extends downwards to the lower turn roller at the bottom of the waste water container 33.
  • the inclined path 38 of the filtering belt 31 up through the waste water container is sealingly connected to check rails, illustrated in further detail in Fig. 5, forming the active filter area.
  • the water flows through the filter and out into the waste water container and up to a laterally arranged end or outlet piece 39 at the upper edge of the waste water container. This is located below the first upper turn roller 34.
  • the filtering belt 31 forms a web 40 with a reversed surface, to allow collected residues to fall down into a collecting gutter 41. Loose particles and other loose residues will, after having passed the second upper turn roller 36, fall freely and become collected by a transverse screw conveyor 42 transporting the filtrate transversely out to a suitable collecting means.
  • a transverse blowing device 43 is arranged above the belt region and above the screw conveyor 42 and is connected to an air compressor (the latter not shown).
  • This can be an elongate pipe provided with suitable outlet nozzles or outlet slits directed downwards to the upwards facing side of the filtering belt 31, i.e., the reverse in relation to the filtrate.
  • blowing device 43 can remove different types of deposits or sediments which otherwise would have remained attached to the filtering belt and thus formed a filter cake which finally would have clogged the filtering belt.
  • Some of this advantageous effect is assumed to be caused by the air heating which occurs at the blowout through substantially narrow nozzles or slits. This heating can occur without any substantial energy supply because of the high specific heat of the air, since the air 5 blow provides a highly effective heat transfer to deposits on the filter belt.
  • An ejection pipe 44 for ejecting water jets to the filtering belt is located downstream of the blowing device 43. These water jets are capable of removing residues which are disengaged by the air flow but which are still attached to the filtering belt 31. For colleting of the water supplied and the last residues, a further transverse collecting gutter
  • waste water container 15 is arranged transversely to the waste water container to recycle untreated waste water if the supply exceeds capacity.
  • a sensor 49 is located within the waste water container 33, such as an air pipe monitoring the counterpressure towards injected air, thus determining when the waste water level exceeds a certain level.
  • the sensor can be a float or level
  • the sensor 49 is connected to a control system (not illustrated) for a driving motor 50 arranged at one end of the rear turn roller 36 for driving the filtering belt.
  • This control system secures a sufficiently low speed of the filtering belt that the level within the waste water container 33 is kept below a certain height. Accordingly, there is established a sufficient length of the upwards rising part 38
  • a suction box 50 can be arranged below the upper section of the filtering belt 31 and connected to an extract fan (not illustrated) to further extract water from deposits upon the filtering belt.
  • Figure 5 illustrates detail for the guidance of the filtering belt 31.
  • the filter belt can employ a mesh of polyester web having threads of 0,3 mm and holes of 0,3 mm. This will provide a web thickness of 0,6 mm.
  • a transmission belt 51 exhibiting a guiding fin 52 at the underside can be provided as a driving mechanism for the filtering belt.
  • the transmission belt 51 can be constructed of, e.g., polyurethane, optionally having reinforcing threads. Accordingly, it runs over the turn rollers and is conveyed between same on a guide rail 53 with a slot 54 for the guiding fin 52.
  • the guide rail 53 5 can be constructed of polyethylene and can be nailed to a steel rail 55 connected to the box girder 56 of the cleaning device.
  • the guide rail 53 is at its inner edge provided with a upwards extending flange 57 as a transverse guide for the transmission belt 51.
  • a clamping rail 58 of polyethylene is arranged over the edge, connected to the box girder
  • the guide rail is provided with a downcast fin 61 forming an external and an internal drain groove 62,63.
  • a lip 64 is arranged, constructed of a soft material, for example teflon rubber, at the edge having a land surface 65 faced towards the filtering belt 31.
  • the filtering belt 31 is covered by a band 66 in the edge area to protect
  • the lip 64 is inserted into a slit 67 forming an angle of about 70 degrees with the band plane.
  • a series of screws 68 are fastened at an angle with the slit 67 to anchor the lip 64 within the slit 67.
  • This construction of the filtering belt 31 guidance provides several advantages, such as decreased wear and a proper sealing effect.
  • the filtering belt can be arranged tightly to
  • This construction enables a more effective compression within the screw conveyor 42 than was achievable by former constructions.
  • the outlet pipe 71 is perforated at the end of the screw conveyor

Abstract

Cleaning device having an endless filtering belt (31) guided through a waste water container (33) for filtering of waste water. The filtering belt is guided over a series turn rollers (32, 34, 36, 37) so that the belt in a certain region runs substantially horizontally with the filtrate faced downwards. Within this region there is a rod shaped blowoff device (43) for blowing air towards the filtering belt. Below the blowoff device (44) there is arranged a screw conveyor (42) for removing residues dislodged from the filter mesh. The filtering belt (31) is located adjacent to a transmission belt (51) and is pressed against the same by a clamping rail (58) within the rising section (38) of the filtering belt. The device is provided with a control device (4) adapting the filtering belt movement with the waste water supply, thus keeping the waste water surface below a certain level to provide a high degree of dewatering within the upwards rising section of the filtering belt (31). The blowoff device (43) is shaped to produce a knife shaped air beam directed towards the filtering belt from a sufficiently short distance to effect substantially full penetration through the openings of the filtering belt. The lateral edges of the filtering belt are covered by a tight cover band (66) pressed downwards by a soft elastic pressure lip (64).

Description

Cleaning device for waste water.
The invention is related to a waste water cleaning device in accordance with the introductory part of patent claim 1 and a blowoff device for blowing air or another gas towards a mesh shaped cleaning belt arranged within such a cleaning device, thus removing contamination from the cleaning belt.
Background
Cleaning devices having endless filtering belts are subjected to deposit of certain types of filtering residues resulting in clogging of the band or belt, such as filtering residues in municipal waste water and starch residues in waste water from potato refinement plants.
US Patent 2 885 080 discloses cleaning of the filtering band with a water jet from the upper side. However, heating of the water to increase the cleaning efficiency is energy demanding and the water supply involves increased separation need, particularly when water is the primary cleaning medium for the filter band thus requiring substantial supply.
NO Patent 165 826 discloses a device that uses air blow from the underside of the filtering band to lift water and particles from the band and direct the water back to the band. Nor this device is capable of giving any satisfactory operation of the cleaning plants of interest, i.e., cleaning of municipal waste water.
WO A87/02595 (Ericksson) describes blowing pressurized air or water from above towards a filtering belt and collecting the filtrate in a collecting chute. This form of filtrate removal has not been effective. Air blowing in this way is at best suitable for removal of dry filtrate not containing fat or similar compounds.
US Patent 4 921 608 solves this problem by spraying hot water vapour. However, this technical solution is both equipment and energy demanding and it is for that reason an efficient but costly implementation. NO Patent 178608 describes a cleaning device having an endless filtering belt carried through a waste water container for filtering of waste water, wherein the filtering band is carried over numerous rollers in such a way that it, in a certain area runs substantially horisontally with the filtrate turned downwards. Within this area there is a rod shaped exhaust or blowoff device to effect an air blow towards the filtering belt. A blowoff device is arranged in parallel with the blowoff device and downstream to spray water jets towards the filtering band. This cleaning device has several weaknesses with regard to the cooperation between its separate modules. An example of the latter is the blowoff device which has a particularly high energy demand to achieve satisfactory tearing-off effect. Moreover, the device has been subject to clogging because of particles moved into the blowing aperture.
Object The main object of the invention is therefore to improve the cleaning device disclosed in NO Patent 178608. Another object of the invention is to increase the cleaning throughput and cleaining efficiency. In that connection it is important to effect proper water removal from the filter mesh, irrespective of the quantity of waste water supplied and of the solid content of the waste water. With regard to the filter mesh, it is important to guide the mesh in such a way that the speed can be varied without effecting any substantial wear. In other words, an object of the invention is to improve guidance and treatment of the filter mesh to ensure a long service life at varying speeds. A particular object of the invention is to provide a blowoff device having improved efficiency with regard to the disengagement efficiency in order to remove deposits having a low solid content from the filter mesh. Another object is to obtain a high blowing air speed to decrease the energy demand and obtain effective cleaning in a larger mesh area, in order to prevent fat deposits, among others. Another object is to provide a blowing device which is less subject to clogging.
Invention
The cleaning device can be improved by the novel features recited in claim 1. Other favourable features of the invention appears from claims 2-.? . The essential features of the invention establish a low water content within the deposits guided from the filter mesh to the screw conveyor. The screw conveyor will then be able to perform an effective pressing of the solids to further decrease the water portion, which again decreases the handling problems with the residue waste. The construction of the blowing device also contributes to increase the cleaning efficiency. As far as we are concerned, the increased cleaning efficiency is caused by the construction providing an advantageous combination of increased air speed and increased air jet width, which is effective to the cleaning belt. First, the novel construction provides an increased air blow speed when it leaves the blowing device and passes through the filter mesh. This is particularly the case when the air blow pressure is at least 0.8 bar. The result is an increased mechanical effect because of the increased speed within the cleaning area and an effective operation across a larger width of the filter mesh. This provides increased cleaning effect and/or allows for reduction of air quantity or air pressure, thus resulting in a reduced energy demand. Another advantage of the invention is that the air slot is substantially wider in the section contacting the cleaning belt, i.e., the filter mesh. When the filter mesh is moving there is a risk for particle movement into the air slot. By having a larger air slot, in accorcance with the invention and producing a wider air jet at a higher speed, the problem with solid movement and sliding and deposit of contaminants from the cleaning belt will decrease, which again results in a more reliable operation and reduced maintaneance.
Example The invention is illustrated in the drawings, wherein
Figure 1 illustrates a schematic side view of a blowing device in accordance with the invention for use with a cleaning device illustrated in Figure 3 and 4,
Figure 2 illustrates a cross section through the center part of the blowing device of Figure 1, Figure 3 illustrates a side view of a cleaning device in accordance with the invention, wherein the blowing device of Figure- ~ 2 is attached,
Figure 4 illustrates a partially sectioned end view of the eject end of the cleaning device of Figure 3 and, Figure 5 illustrates a cross section through the guiding or clamping rails of the filter mesh edge.
Fig. 1 illustrates a rod shaped blowing device 11 provided with brackets 12 and 13 at each end thereof to facilitate mounting within a plant (not shown), e.g., beneath and upto a cleaning belt 14 for waste water (Fig. 2). The cleaning belt 14 may be comprised of a filter mesh extending through an accept zone (not illustrated), e.g., for waste water, and further extending, having its rear side facing upwards, past the underlying blowing device 11, wherein deposits possibly containing fat are to be removed.
The blowing device 11 comprises a supply pipe 15, such as a rectangular pipe provided with a series of holes at its top side, connected to a pressurised air source (not illustrated). At one end of said pipe there is attached a pipe shaped angle piece 16. A nozzle rod 17 is arranged over the supply pipe 15, for example a polymer pipe, as illustrated in further detail in cross section in Figure 2 and which constitutes a substantial part of the present invention.
Figure 2 illustrates how the nozzle rod 17 comprises an elongate inlet chamber 18 which receives compressed air from the adjacent elongate supply pipe 15. The nozzle rod 17 can, for example, be screwed into the supply pipe 15 with a series of holes 19 in the resting surface towards the inlet chamber. The inlet chamber can exhibit a width of 8 mm, and a bottom converging with an opening angle of 120 degrees and forming an inlet manifold to a series of holes extending through the nozzle rod, e.g., having a diameter of 2.5 mm, a length of 1-10 mm and a centre distance of 4 mm.
The series of holes 18 open into an elongate outlet slit 20 having a width at the outlet of about 1 : 5 of the hole diameter and having a depth of about 5 times the narrowest width. The outlet slit 21 expands like a trumpet towards the outlet, i.e., having a diverging course from a short inlet section 21 A having parallel walls, an intermediate section 21B having walls forming an opening angle of about 20 degrees, to an outlet section 21 C having a rounded transition to an outer edge 2 ID. This construction will establish a modified flow regime at the decompression and the transition from the outlet slit 21 to the cleaning belt.
In accordance with the invention, firstly the air speed at the slit outlet 21C will increase, which again increases the volume of the air flowing up to the cleaning belt. Accordingly, a stronger air flow is established, both with regard to intensity and size, as stated above.
In order to stabilise the nozzle rod 17 mechanically in relation to the supply pipe 15, the rod is provided with a groove 22, in the region at the inlet slit 18, forming elongate side flanges 21 and 24 being engaged with the supply pipe.
Numerous parameters of this construction can be modified in relation to the embodiment illustrated, such as the distance between the nozzle rod and cleaning belt, the length of the parallel section of the outlet slit, which may be zero, the opening angle of the outlet slit and the curved outlet section of the same.
The ratio between the compressing section 20 and the outlet section 21 C is less than about 1:5, preferably less than about 1:10. The width of the outlet section is about 1:5 of the length of the diverging section 21B, 21C. Figures 3 and 4 show a cleaning device in accordance with the invention having an endless filtering belt 31 guided over a lower turn roller 21 , inclined upwards through a waste water container 33 to a first upper turn roller 34 and over a horizontal section 35 to a second upper turn roller 36 guiding the belt back below the horizontal section 35 to an underlying turn roller 37 below the first upper turn roller 34. From this position the filtering belt 31 extends downwards to the lower turn roller at the bottom of the waste water container 33. The inclined path 38 of the filtering belt 31 up through the waste water container is sealingly connected to check rails, illustrated in further detail in Fig. 5, forming the active filter area. The water flows through the filter and out into the waste water container and up to a laterally arranged end or outlet piece 39 at the upper edge of the waste water container. This is located below the first upper turn roller 34. In the region between the second upper turn roller 36 and the underlying turn roller 37, the filtering belt 31 forms a web 40 with a reversed surface, to allow collected residues to fall down into a collecting gutter 41. Loose particles and other loose residues will, after having passed the second upper turn roller 36, fall freely and become collected by a transverse screw conveyor 42 transporting the filtrate transversely out to a suitable collecting means.
In order to remove sticking filtrate, a transverse blowing device 43 is arranged above the belt region and above the screw conveyor 42 and is connected to an air compressor (the latter not shown). This can be an elongate pipe provided with suitable outlet nozzles or outlet slits directed downwards to the upwards facing side of the filtering belt 31, i.e., the reverse in relation to the filtrate.
It has been shown that such a blowing device 43 can remove different types of deposits or sediments which otherwise would have remained attached to the filtering belt and thus formed a filter cake which finally would have clogged the filtering belt. Some of this advantageous effect is assumed to be caused by the air heating which occurs at the blowout through substantially narrow nozzles or slits. This heating can occur without any substantial energy supply because of the high specific heat of the air, since the air 5 blow provides a highly effective heat transfer to deposits on the filter belt.
An ejection pipe 44 for ejecting water jets to the filtering belt is located downstream of the blowing device 43. These water jets are capable of removing residues which are disengaged by the air flow but which are still attached to the filtering belt 31. For colleting of the water supplied and the last residues, a further transverse collecting gutter
10 45 with a transversely directed outlet pipe is arranged as an extension of the collecting gutter 41. The water from this trough is directed back to the waste water container. At the inlet end of the cleaning device there is an inlet piece 46 for waste water, having an internal covering screen 47 conducting the waste water down to the bottom of the waste water container 33. Adjacent to the covering screen 47 an overflow screen 48
15 is arranged transversely to the waste water container to recycle untreated waste water if the supply exceeds capacity.
A sensor 49 is located within the waste water container 33, such as an air pipe monitoring the counterpressure towards injected air, thus determining when the waste water level exceeds a certain level. Alternatively, the sensor can be a float or level
20 indicator based upon sound waves. The sensor 49 is connected to a control system (not illustrated) for a driving motor 50 arranged at one end of the rear turn roller 36 for driving the filtering belt. This control system secures a sufficiently low speed of the filtering belt that the level within the waste water container 33 is kept below a certain height. Accordingly, there is established a sufficient length of the upwards rising part 38
25 of the filtering belt 31 so that the water content of deposited mass upon the filtering belt is kept below 95%, preferably below 90%.
A suction box 50 can be arranged below the upper section of the filtering belt 31 and connected to an extract fan (not illustrated) to further extract water from deposits upon the filtering belt.
30 Figure 5 illustrates detail for the guidance of the filtering belt 31. For example, the filter belt can employ a mesh of polyester web having threads of 0,3 mm and holes of 0,3 mm. This will provide a web thickness of 0,6 mm. A transmission belt 51 exhibiting a guiding fin 52 at the underside can be provided as a driving mechanism for the filtering belt. The transmission belt 51 can be constructed of, e.g., polyurethane, optionally having reinforcing threads. Accordingly, it runs over the turn rollers and is conveyed between same on a guide rail 53 with a slot 54 for the guiding fin 52. The guide rail 53 5 can be constructed of polyethylene and can be nailed to a steel rail 55 connected to the box girder 56 of the cleaning device. The guide rail 53 is at its inner edge provided with a upwards extending flange 57 as a transverse guide for the transmission belt 51. In order to keep the filtering belt 31 in contact with the transmission belt 51 , a clamping rail 58 of polyethylene is arranged over the edge, connected to the box girder
10 56 with a screw 59 and a pressure plate 60. The guide rail is provided with a downcast fin 61 forming an external and an internal drain groove 62,63. In order to establish pressure against the filtering belt 31 a lip 64 is arranged, constructed of a soft material, for example teflon rubber, at the edge having a land surface 65 faced towards the filtering belt 31. The filtering belt 31 is covered by a band 66 in the edge area to protect
15 the filtering belt 31 against wear. The lip 64 is inserted into a slit 67 forming an angle of about 70 degrees with the band plane. A series of screws 68 are fastened at an angle with the slit 67 to anchor the lip 64 within the slit 67.
This construction of the filtering belt 31 guidance provides several advantages, such as decreased wear and a proper sealing effect. The filtering belt can be arranged tightly to
20 the turn rollers and in this way be guided securely, also at high speed.
This construction enables a more effective compression within the screw conveyor 42 than was achievable by former constructions. By providing the outlet pipe 70 with a spring loaded lid 71 it is possible to press the solids to effect a dewatering of the same within the outlet pipe. The outlet pipe 71 is perforated at the end of the screw conveyor
25 42 and is provided with a collecting jacket 72 with a drain pipe 73.

Claims

Claims.
1. Cleaning device having an endless belt (31) guided through a waste water container (33) for filtering of waste water and over a series of turn rollers (32,34,36,37) making the belt run substantially horizontally having the filtrate faced downwards, wherein there is a rod shaped exhaust or blowoff device (43) for blowing air towards the filtering belt, and in parallel with the blowoff device (43) and downstream there is arranged a nozzle pipe (44) for spraying water jets towards the filtering belt, and a screw conveyor (42) is arranged below the blowoff device . ) for removing residues dislogded from the filter mesh, and the filtering belt (31) is in contact with a transmission belt (51) and pressed against the same by a clamping rail (58) within the rising section (38) of the filtering belt, c h a r a c t e r i z e d in that the device further comprises a control means (4) adapting the filtering belt movement in relation to the waste water supply in order to keep the waste water surface below a certain level and thus obtaining a strong dewatering within the upwards rising section of the filtering belt (31), wherein the blowoff device (43) for air is formed to provide a knife shaped air beam directed towards the filtering belt from a distance sufficiently short to substantially penetrate the openings of the filtering belt, and the lateral edges of the filtering belt are covered by a tight cover band (66) pressed by a soft elastic pressure lip (64).
2. Cleaning device in accordance with claim 1, c h a r a c t e r i z e d in that the pressure lip (64) is inserted into a slit (67) extending transversely upwards from the edge of the clamping rail (58).
3. Cleaning device in accordance with claim 1 or 2, c h a r a c t e r i z e d in that a box (50) is arranged below the upper section (35) of the filtering belt in order to provide an air vent through the filtering belt.
4. Cleaning device in accordance with anyone of claims 1 to 3, wherein deposits from the filtering belt are directed down into a screw conveyor (42) at the high end of the filtering belt, characterized in that the screw conveyor (42), in a manner known er se, is provided with an outlet pipe (71) having a spring loaded end cover, in this way pressing the solids prior to exit.
5. Blowing device for use with a cleaning device in accordance with claim 1, for blowing air or a similar gas towards a cleaning belt (15), particularly a filter mesh, thus removing contaminants from the cleaning belt, e.g., within a cleaning plant for waste water, wherein a rod shape body comprises an elongate slit having a width causing compression of air flowing through the same, and a constriction (20), particularly in the form of a series of holes, characterized in that the elongate slit exhibits an outlet section (21) expanding from the constriction (20) with a curved transition region to the rod shaped front end side (21D) towards the cleaning belt (15).
6. Blowing device in accordance with claim 5, characterized in that the front end side (2 ID) is arranged in contact with the cleaning belt (15).
7. Blowing device in accordance with claim 5 or 6, characterized in that the outlet section (21) exhibits a rectilinear diverging section (2 IB) having an opening angle of about 20 degrees.
8. Blowing device in accordance with anyone of claims 5 to 7, characterized in that the ratio between the compressing area (20) and the outlet section (21C) is less than about 1:5, preferably less than about 1:10.
9. Blowing device in accordance with anyone of claims 5 to 8, characterized in that the width of the outlet area is about 1/5 of the length of the diverging section (21B,21C).
PCT/NO2000/000032 2000-02-03 2000-02-03 Cleaning device for waste water WO2001056681A1 (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US10/182,971 US6942786B1 (en) 2000-02-03 2000-02-03 Cleaning device for waste water
ES00904145T ES2304941T3 (en) 2000-02-03 2000-02-03 RESIDUAL WATER CLEANING DEVICE.
CNB008187800A CN1177639C (en) 2000-02-03 2000-02-03 Cleaning device for waste water
PCT/NO2000/000032 WO2001056681A1 (en) 2000-02-03 2000-02-03 Cleaning device for waste water
AU25815/00A AU777350B2 (en) 2000-02-03 2000-02-03 Cleaning device for waste water
DE60038745T DE60038745T2 (en) 2000-02-03 2000-02-03 DEVICE FOR CLEANING WASTE WATER
EP00904145A EP1251929B1 (en) 2000-02-03 2000-02-03 Cleaning device for waste water
DK00904145T DK1251929T3 (en) 2000-02-03 2000-02-03 Wastewater treatment plant
MXPA02007450A MXPA02007450A (en) 2000-02-03 2000-02-03 Cleaning device for waste water.
AT00904145T ATE393659T1 (en) 2000-02-03 2000-02-03 DEVICE FOR PURIFYING WASTE WATER
CA2398067A CA2398067C (en) 2000-02-03 2000-02-03 Cleaning device for waste water
PT00904145T PT1251929E (en) 2000-02-03 2000-02-03 Cleaning device for waste water

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/NO2000/000032 WO2001056681A1 (en) 2000-02-03 2000-02-03 Cleaning device for waste water

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WO2001056681A1 true WO2001056681A1 (en) 2001-08-09

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US (1) US6942786B1 (en)
EP (1) EP1251929B1 (en)
CN (1) CN1177639C (en)
AT (1) ATE393659T1 (en)
AU (1) AU777350B2 (en)
CA (1) CA2398067C (en)
DE (1) DE60038745T2 (en)
DK (1) DK1251929T3 (en)
ES (1) ES2304941T3 (en)
MX (1) MXPA02007450A (en)
PT (1) PT1251929E (en)
WO (1) WO2001056681A1 (en)

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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100384706C (en) * 2003-02-25 2008-04-30 迪平多茨公司 Cleaning drain apparatus for an auger assembly
EP1683562A1 (en) * 2005-01-20 2006-07-26 Knoll Maschinenbau Gmbh Cleaning device for filter belts
DE102005038018A1 (en) * 2005-08-09 2007-02-22 Beyss Gmbh Removing filter cake from filter belt in cleaning solution contaminated with greasy dirt from cleaning parts of rail cars, involves blowing cake off belt with blast air which is sucked through belt into settling tank
DE102005038018B4 (en) * 2005-08-09 2008-08-28 Richard Kirch A method for removing a filter cake from a filter belt and apparatus for cleaning a cleaning solution
WO2009091260A1 (en) * 2008-01-15 2009-07-23 Salsnes Filter As Method and system for particle reduction.
RU2484880C2 (en) * 2008-01-15 2013-06-20 Салснес Филтер АС Method and system of reducing quantity of particles
EP2533876A1 (en) * 2010-07-02 2012-12-19 M2 Renewables Sewage solids separator and dewatering plant
EP2533876A4 (en) * 2010-07-02 2013-06-26 M2 Renewables Sewage solids separator and dewatering plant
EP2821373A4 (en) * 2012-03-02 2015-12-02 Metawater Co Ltd Sludge condensing machine
US10035720B2 (en) 2012-03-02 2018-07-31 Metawater Co., Ltd. Sludge condensing machine
AT511926B1 (en) * 2012-12-21 2014-02-15 Kurt Ing Gassner Process for the mechanical separation of solids from wastewater
AT511926A3 (en) * 2012-12-21 2013-11-15 Kurt Ing Gassner Process for the mechanical separation of solids from wastewater
US11724947B2 (en) 2013-02-22 2023-08-15 Bl Technologies, Inc. Membrane assembly for supporting a biofilm
US10781119B2 (en) 2013-02-22 2020-09-22 Bl Technologies, Inc. Membrane assembly for supporting a biofilm
WO2015142337A1 (en) 2014-03-20 2015-09-24 General Electric Company Method and apparatus for cleaning a rotating belt sieve
US10160679B2 (en) 2014-03-20 2018-12-25 Bl Technologies, Inc. Wastewater treatment with primary treatment and MBR or MABR-IFAS reactor
US11850554B2 (en) 2014-03-20 2023-12-26 Bl Technologies, Inc. Wastewater treatment with primary treatment and MBR or MABR-IFAS reactor
CN103933773A (en) * 2014-04-21 2014-07-23 刘猛 Reciprocating and rotary gray water purifying slag remover
CN111530144A (en) * 2020-05-11 2020-08-14 黄添添 Filter is collected to multiple filtration formula ditch dross
CN114963738B (en) * 2022-06-15 2023-05-23 安徽古麒绒材股份有限公司 Dust removal drying device of water-repellent eiderdown
CN114963738A (en) * 2022-06-15 2022-08-30 安徽古麒绒材股份有限公司 Refuse dust removal drying device of eiderdown

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Publication number Publication date
AU2581500A (en) 2001-08-14
CN1177639C (en) 2004-12-01
CA2398067C (en) 2010-05-25
CN1433336A (en) 2003-07-30
CA2398067A1 (en) 2001-08-09
ATE393659T1 (en) 2008-05-15
MXPA02007450A (en) 2004-08-23
ES2304941T3 (en) 2008-11-01
EP1251929B1 (en) 2008-04-30
DK1251929T3 (en) 2008-08-04
DE60038745T2 (en) 2009-07-02
PT1251929E (en) 2008-07-18
EP1251929A1 (en) 2002-10-30
DE60038745D1 (en) 2008-06-12
US6942786B1 (en) 2005-09-13
AU777350B2 (en) 2004-10-14

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