CA2247217C - A device for creation of an oxidation and precipitation zone or a reduction zone in an aquifer - Google Patents
A device for creation of an oxidation and precipitation zone or a reduction zone in an aquifer Download PDFInfo
- Publication number
- CA2247217C CA2247217C CA002247217A CA2247217A CA2247217C CA 2247217 C CA2247217 C CA 2247217C CA 002247217 A CA002247217 A CA 002247217A CA 2247217 A CA2247217 A CA 2247217A CA 2247217 C CA2247217 C CA 2247217C
- Authority
- CA
- Canada
- Prior art keywords
- water
- outer tube
- conduit
- aquifer
- zone
- 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.)
- Expired - Lifetime
Links
Classifications
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
-
- 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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/06—Methods or installations for obtaining or collecting drinking water or tap water from underground
- E03B3/08—Obtaining and confining water by means of wells
- E03B3/15—Keeping wells in good condition, e.g. by cleaning, repairing, regenerating; Maintaining or enlarging the capacity of wells or water-bearing layers
Abstract
The invention refers to a device for creating in an aquifer an oxidation and precipitation zone or a reduction zone between a number of injection wells arranged around one or more extraction wells for purified water, said injection wells each comprising an outer wate r- pervious tube (1). For preventing such a device from being clogged the invention suggests that at t he upper end of the outer tube (1) is mounted a circulation vessel (2) from which extends downwardly within the outer tube (1) a first conduit (3), ending at the height of the upper portion of t he aquifer and provided with a pressure inlet means (5) so as to form an upper ejector, and a second conduit (4), which at its lower end supports an externally sealingly mounted balloon body (7), whi ch is inflatable into sealing engagement with the inner surface of the outer tube (1), said second conduit closely above said body carrying a pressure inlet means (6), so as to form a second ejecto r.
Description
A DEVICE FOR CREATION OF AN OXIDATION AND PRECIPITATION
ZONE OR A REDUCTION ZONE IN AN AQUIFER
The present invention refers to a device for carrying-out of the process described in the publication print WO
92/00918, i.e. for creating in an aquifer an oxidation and precipitation zone or a reduction zone between a number of injection wells arranged around one or more extraction wells for purified water, which zone is intended for in situ precipitation or reduction of substances not desired in the ground water, the desired zone being created intermittently between each pair of adjacent injection wells by (i) introducing c>xygen, oxygen-containing gas or an oxygen-releasing substances into the water in both wells when creating an oxidation and precipitation zone, or introducing into the water in both wells an oxygen-consuming substance when creating a reduction zone, and (ii) pumping the water in one of the wells from below upwards while pumping the water in the other well from above downwards whereby a circulation circuit is formed in the aquifer between the t:wo wells, said injection wells each comprising an outer tube which at least at the ground-water carrying portion of its length is apertured and water-previous.
The prior device suggested according to the WO
92/00918 has shown to operate satisfactorily in a number of applications. In some cases where the ground-water has been "troublesome" and severely mingled with contaminants it has turned out that the eject=ors have become rather severely clogged such that the process has been slowed down.
Particularly the re-directing zones in the gaps between the various tubes have been clogged. The outer tube exhibits only one internal surface in contact with the water while the inner tube is surrounded by the "troublesome" water both internally and externally. In the annular spaces between the tubes there are thus formed deposits both at the outer and inner surfaces so that they will be heavily clogged and the flow restricaed. Furthermore, it has turned out to be difficult to flush away or otherwise get rid of said deposits due to the relatively small tube diameter of the injection wells.
The object of the present invention thus is to elimi-nate said disadvantage by means of a differently designed device for this purpose. The invention is essentially distinguished in that at the upper end of the outer tube is mounted a circulation vessel from which extends downwardly within the outer tube on one hand a first conduit, ending at the height of the upper portion of the aquifer and slightly above its mouth being provided with a pressure inlet means so as to form an upper ejector, and at the other a second conduit, which ends at or below the middle of the aquifer and at its lower end supporting an externally sealingly mounted balloon body, which is inflatable into sealing engagement with the inner surface of the outer tube, said second conduit closely above said body carrying a pressure inlet means, so as to form a second ejector, both pressure inlet means and the balloon body being connected with one or more suitable pressure sources.
More particularly, the present invention provides a device for creating in an aquifer an oxidation and precipitation zone or a reduction zone between a number of i i I i i ~ I
a? a injection wells arranged around one or more extraction wells for purified water, wherein the reduction zone is for in situ precipitation or reduction of substances not desired in the ground water, and the reduction zone is created intermittently between each pair of adjacent wells, the device comprising:
each inj ection well compri:~ing an outer tube having a ground water carrying portion along its length, at least at the ground-water-carrying porti«n of its length the outer tube is apertured and water-pervious, a circulation vessel mounted at the upper end of the outer tube, a first conduit which extends downwardly within the outer tube from the circulation vessel and the first conduit ending at the height of the upper portion of the aquifer;
the outer tube having a mouth, and above the mouth the outer tube having a pressure ir..let so as to form an upper ejector;
a second conduit which e:;tends downwardly from the circulation vessel within the: outer tube, the second conduit ending at or below the middle of the aquifer and having a lower end, the second conduit supporting an externally sealingly mounted balloon body, which is inflatable into sealing engagement with the inner surface of the outer tube closely above the balloon body; the second conduit carrying a pres::ure inlet to form a second ejector;
both of the pressure inlet: and the balloon body being connected with one or more pres~;ure sources.
The invention will be described further below with reference to the accompanying drawing, in which in Fig. 1 is illustrated a diagrammatic axial section through a pair 2b of wells and Fig. 2 is a longitudinal section through a device according to the invention.
ZONE OR A REDUCTION ZONE IN AN AQUIFER
The present invention refers to a device for carrying-out of the process described in the publication print WO
92/00918, i.e. for creating in an aquifer an oxidation and precipitation zone or a reduction zone between a number of injection wells arranged around one or more extraction wells for purified water, which zone is intended for in situ precipitation or reduction of substances not desired in the ground water, the desired zone being created intermittently between each pair of adjacent injection wells by (i) introducing c>xygen, oxygen-containing gas or an oxygen-releasing substances into the water in both wells when creating an oxidation and precipitation zone, or introducing into the water in both wells an oxygen-consuming substance when creating a reduction zone, and (ii) pumping the water in one of the wells from below upwards while pumping the water in the other well from above downwards whereby a circulation circuit is formed in the aquifer between the t:wo wells, said injection wells each comprising an outer tube which at least at the ground-water carrying portion of its length is apertured and water-previous.
The prior device suggested according to the WO
92/00918 has shown to operate satisfactorily in a number of applications. In some cases where the ground-water has been "troublesome" and severely mingled with contaminants it has turned out that the eject=ors have become rather severely clogged such that the process has been slowed down.
Particularly the re-directing zones in the gaps between the various tubes have been clogged. The outer tube exhibits only one internal surface in contact with the water while the inner tube is surrounded by the "troublesome" water both internally and externally. In the annular spaces between the tubes there are thus formed deposits both at the outer and inner surfaces so that they will be heavily clogged and the flow restricaed. Furthermore, it has turned out to be difficult to flush away or otherwise get rid of said deposits due to the relatively small tube diameter of the injection wells.
The object of the present invention thus is to elimi-nate said disadvantage by means of a differently designed device for this purpose. The invention is essentially distinguished in that at the upper end of the outer tube is mounted a circulation vessel from which extends downwardly within the outer tube on one hand a first conduit, ending at the height of the upper portion of the aquifer and slightly above its mouth being provided with a pressure inlet means so as to form an upper ejector, and at the other a second conduit, which ends at or below the middle of the aquifer and at its lower end supporting an externally sealingly mounted balloon body, which is inflatable into sealing engagement with the inner surface of the outer tube, said second conduit closely above said body carrying a pressure inlet means, so as to form a second ejector, both pressure inlet means and the balloon body being connected with one or more suitable pressure sources.
More particularly, the present invention provides a device for creating in an aquifer an oxidation and precipitation zone or a reduction zone between a number of i i I i i ~ I
a? a injection wells arranged around one or more extraction wells for purified water, wherein the reduction zone is for in situ precipitation or reduction of substances not desired in the ground water, and the reduction zone is created intermittently between each pair of adjacent wells, the device comprising:
each inj ection well compri:~ing an outer tube having a ground water carrying portion along its length, at least at the ground-water-carrying porti«n of its length the outer tube is apertured and water-pervious, a circulation vessel mounted at the upper end of the outer tube, a first conduit which extends downwardly within the outer tube from the circulation vessel and the first conduit ending at the height of the upper portion of the aquifer;
the outer tube having a mouth, and above the mouth the outer tube having a pressure ir..let so as to form an upper ejector;
a second conduit which e:;tends downwardly from the circulation vessel within the: outer tube, the second conduit ending at or below the middle of the aquifer and having a lower end, the second conduit supporting an externally sealingly mounted balloon body, which is inflatable into sealing engagement with the inner surface of the outer tube closely above the balloon body; the second conduit carrying a pres::ure inlet to form a second ejector;
both of the pressure inlet: and the balloon body being connected with one or more pres~;ure sources.
The invention will be described further below with reference to the accompanying drawing, in which in Fig. 1 is illustrated a diagrammatic axial section through a pair 2b of wells and Fig. 2 is a longitudinal section through a device according to the invention.
In the drawings it is thus shown an outer tube 1 which preferably is cylindrical and introduced into the ground which at least in the ground-water carrying portion which starts at the ground-water level 11, and over portion of its length is apertured and thus water-permeable. In the upper portion of said tube 1 is at/or above the ground sur-face mounted a circulation vessel 2 from which extends downwardly within the outer tube 1 a first conduit 3 which ends at the height of the upper portion of the aquifer.
Slightly above its mouth said conduit 3 is provided with a pressure inlet means 5 so as to form an upper ejector. Fur-thermore, downwardly within the outer tube 1 extends a sec-ond conduit 4, which ends at or below the middle of the ap-ertured portion of the tube 1 in the ground. In its lower portion said conduit carries an externally sealingly mounted balloon body 7 which is inflatable into sealing en-gagement with the inner surface of -the outer tube 1.
Slightly above the body 7 this second conduit 4 supports a pressure inlet means 6 so as to form a second ejector. Both pressure inlet means 5, 6 and the balloon body 7 are con-nected with suitable pressure sources. In the case of form-ing an oxidation zone said pressure fluids consist of air supplied from e.g_ a compressor, while in a reduction proc-ess the pressure fluid for the ejectors consists of water or water solution from a suitable, not-illustrated pump, while the balloon body 7 still is connected with a source of pressurized air through a hose 10.
The circulation vessel 2 has a smoothly rounded shape for improved through-flow and hence reduced risks for the t occurrence of deposits on the inner surface of said vessel.
Slightly above its mouth said conduit 3 is provided with a pressure inlet means 5 so as to form an upper ejector. Fur-thermore, downwardly within the outer tube 1 extends a sec-ond conduit 4, which ends at or below the middle of the ap-ertured portion of the tube 1 in the ground. In its lower portion said conduit carries an externally sealingly mounted balloon body 7 which is inflatable into sealing en-gagement with the inner surface of -the outer tube 1.
Slightly above the body 7 this second conduit 4 supports a pressure inlet means 6 so as to form a second ejector. Both pressure inlet means 5, 6 and the balloon body 7 are con-nected with suitable pressure sources. In the case of form-ing an oxidation zone said pressure fluids consist of air supplied from e.g_ a compressor, while in a reduction proc-ess the pressure fluid for the ejectors consists of water or water solution from a suitable, not-illustrated pump, while the balloon body 7 still is connected with a source of pressurized air through a hose 10.
The circulation vessel 2 has a smoothly rounded shape for improved through-flow and hence reduced risks for the t occurrence of deposits on the inner surface of said vessel.
The vessel 2 furthermore can be provided with a bent vent pipe 8 the opening cross section being controll-able by means of a valve device 9.
The conduits 3 and 4 preferably consist to a great ex-tent of plastic hoses.
Fig. 1 illustrates an example of the location of wells with well pipes A and B between which are to be formed an oxidation and precipitation zone or a reduction zone and in which tubes the inventive device now is intended to be used in order to create the desired and active circulation cir-cuits in the aquifer.
The device described above operates as follows. Presup-posing that the balloon body 7 is inflated and thus seal-ingly engages the inner surface of the outer tube 1 pres-15- surized air or water is supplied to the upper ejector or pressure inlet means 5 and water is then pumped upwardly into the circulation vessel 2 for being deaerated. The out-let valve 9 of the vent pipe 8 of the vessel 2 is re-stricted to a suitable extent. The water then is pressed downwardly through the conduit 4 into the lower portion of the tube 1 below the balloon body 7. From there, the water is pressed into the surrounding ground.
Tnversely, air or water/water solution may be supplied at the lower ejector or pressure inlet means 6 for pressing water upwardly through the conduit 4 to the vessel 2 for being deaerated. The water then flows back through the con-duit 3 for being pressed out into the ground water in the ground above the body 7.
Should non-desired deposits occur within the tube and y the conduits 3 and 4, a flushing may easily be carried out after emptying the balloon body 7 of air.
The conduits 3 and 4 preferably consist to a great ex-tent of plastic hoses.
Fig. 1 illustrates an example of the location of wells with well pipes A and B between which are to be formed an oxidation and precipitation zone or a reduction zone and in which tubes the inventive device now is intended to be used in order to create the desired and active circulation cir-cuits in the aquifer.
The device described above operates as follows. Presup-posing that the balloon body 7 is inflated and thus seal-ingly engages the inner surface of the outer tube 1 pres-15- surized air or water is supplied to the upper ejector or pressure inlet means 5 and water is then pumped upwardly into the circulation vessel 2 for being deaerated. The out-let valve 9 of the vent pipe 8 of the vessel 2 is re-stricted to a suitable extent. The water then is pressed downwardly through the conduit 4 into the lower portion of the tube 1 below the balloon body 7. From there, the water is pressed into the surrounding ground.
Tnversely, air or water/water solution may be supplied at the lower ejector or pressure inlet means 6 for pressing water upwardly through the conduit 4 to the vessel 2 for being deaerated. The water then flows back through the con-duit 3 for being pressed out into the ground water in the ground above the body 7.
Should non-desired deposits occur within the tube and y the conduits 3 and 4, a flushing may easily be carried out after emptying the balloon body 7 of air.
Claims (7)
1. A device for creating in an aquifer an oxidation and precipitation zone or a reduction zone between a number of injection wells arranged around one or more extraction wells for purified water, wherein the reduction zone is for in situ precipitation or reduction of substances not desired in the ground water, and the reduction zone is created intermittently between each pair of adjacent wells, the device comprising:
each injection well comprising an outer tube having a ground water carrying portion along its length, at least at the ground-water-carrying portion of its length the outer tube is apertured and water-pervious, a circulation vessel mounted at the upper end of the outer tube, a first conduit which extends downwardly within the outer tube from the circulation vessel and the first conduit ending at the height of the upper portion of the aquifer;
the outer tube having a mouth, and above the mouth the outer tube having a pressure inlet so as to form an upper ejector;
a second conduit which extends downwardly from the circulation vessel within the outer tube, the second conduit ending at or below the middle of the aquifer and having a lower end, the second conduit supporting an externally sealingly mounted balloon body, which is inflatable into sealing engagement with the inner surface of the outer tube closely above the balloon body; the second conduit carrying a pressure inlet to form a second ejector;
both of the pressure inlets and the balloon body being connected with one or more pressure sources.
each injection well comprising an outer tube having a ground water carrying portion along its length, at least at the ground-water-carrying portion of its length the outer tube is apertured and water-pervious, a circulation vessel mounted at the upper end of the outer tube, a first conduit which extends downwardly within the outer tube from the circulation vessel and the first conduit ending at the height of the upper portion of the aquifer;
the outer tube having a mouth, and above the mouth the outer tube having a pressure inlet so as to form an upper ejector;
a second conduit which extends downwardly from the circulation vessel within the outer tube, the second conduit ending at or below the middle of the aquifer and having a lower end, the second conduit supporting an externally sealingly mounted balloon body, which is inflatable into sealing engagement with the inner surface of the outer tube closely above the balloon body; the second conduit carrying a pressure inlet to form a second ejector;
both of the pressure inlets and the balloon body being connected with one or more pressure sources.
2. A device according to claim 1, wherein the circulation vessel (2) has smoothly rounded shape which improves through-flow and hence reduces risk of deposits on the inner surface of the vessel.
3. A device according to claim 1 or 2, wherein the circulation vessel (2) has a bent vent tube (8) having a mouth cross section controllable by means of a valve device (9).
4. A device according to any one of claims 1 to 3, wherein the conduits (3, 4) have a greater portion of their length consisting of a plastic hose.
5. A device according to claim 1, wherein, in an oxidation process, air is used as a pressure fluid.
6. A device according to claim 1, wherein, in a reduction process, water is used as a pressure fluid to the inlets and the device further comprises a pump for the fluid.
7. Use of a device according to claim 1, wherein the device is operable for (i) introducing oxygen, oxygen-containing gas or an oxygen-releasing substance into the water in two adjacent wells when creating an oxidation and precipitation zone, or introducing into the water in two adjacent wells an oxygen-consuming substance when creating a reduction zone, and (ii) pumping the water in one of the wells from below upwards while pumping the water in the other well from above downwards whereby a circulation circuit is formed in the aquifer between the two adjacent wells.
Priority Applications (16)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/125,613 US6174107B1 (en) | 1996-02-21 | 1996-02-21 | Device for creation of an oxidation and precipitation zone or a reduction zone in an aquifer |
| JP53004197A JP3889052B2 (en) | 1996-02-21 | 1996-02-21 | Apparatus for forming an oxidation and precipitation zone or a reduction zone in an aquifer |
| DK96909410T DK0885171T3 (en) | 1996-02-21 | 1996-02-21 | Device for generating an oxygenation and precipitation zone or a reduction zone in a groundwater artery |
| DE69616600T DE69616600T2 (en) | 1996-02-21 | 1996-02-21 | DEVICE FOR GENERATING AN OXIDATION ZONE AND DEPOSITION OR REDUCTION ZONE IN A GROUNDWATER LEADING LAYER |
| SK1153-98A SK283505B6 (en) | 1996-02-21 | 1996-02-21 | A device for creation of an oxidation and precipitation zone or a reduction zone in an aquifer |
| EP96909410A EP0885171B1 (en) | 1996-02-21 | 1996-02-21 | A device for creation of an oxidation and precipitation zone or a reduction zone in an aquifer |
| EE9800258A EE03759B1 (en) | 1996-02-21 | 1996-02-21 | Device for creating an oxidation and precipitation zone or a reduction zone in the water catchment area |
| ES96909410T ES2167553T3 (en) | 1996-02-21 | 1996-02-21 | DEVICE FOR THE CREATION OF AN OXIDATION AND PRECIPITATION AREA OR A REDUCTION AREA IN AN ACUIFERO. |
| PCT/SE1996/000238 WO1997030942A1 (en) | 1996-02-21 | 1996-02-21 | A device for creation of an oxidation and precipitation zone or a reduction zone in an aquifer |
| AT96909410T ATE207855T1 (en) | 1996-02-21 | 1996-02-21 | DEVICE FOR CREATING AN OXIDATION ZONE AND DEPOSITION OR A REDUCTION ZONE IN A GROUNDWATER-COURING LAYER |
| PT96909410T PT885171E (en) | 1996-02-21 | 1996-02-21 | DEVICE FOR THE CREATION OF AN AREA OF OXIDACATION AND PRECIPITATION OR A REDUCTION AREA IN AN AQUIFERO |
| HU9903977A HU221778B1 (en) | 1996-02-21 | 1996-02-21 | Well-device for periodical purifikation of water in situ |
| CA002247217A CA2247217C (en) | 1996-02-21 | 1996-02-21 | A device for creation of an oxidation and precipitation zone or a reduction zone in an aquifer |
| CZ19982642A CZ291148B6 (en) | 1996-02-21 | 1996-02-21 | Device for creating oxidation and precipitation or reduction zone in an aquifer |
| PL96328490A PL181119B1 (en) | 1996-02-21 | 1996-02-21 | Apparatus for creating an oxidation and educing zone or reduction zone in an aquiferous formation |
| NO19983821A NO315418B1 (en) | 1996-02-21 | 1998-08-20 | Device for providing an oxidation and precipitation zone or a single reduction zone in a water-bearing layer |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002247217A CA2247217C (en) | 1996-02-21 | 1996-02-21 | A device for creation of an oxidation and precipitation zone or a reduction zone in an aquifer |
| PCT/SE1996/000238 WO1997030942A1 (en) | 1996-02-21 | 1996-02-21 | A device for creation of an oxidation and precipitation zone or a reduction zone in an aquifer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2247217A1 CA2247217A1 (en) | 1997-08-28 |
| CA2247217C true CA2247217C (en) | 2007-01-09 |
Family
ID=25680484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002247217A Expired - Lifetime CA2247217C (en) | 1996-02-21 | 1996-02-21 | A device for creation of an oxidation and precipitation zone or a reduction zone in an aquifer |
Country Status (16)
| Country | Link |
|---|---|
| US (1) | US6174107B1 (en) |
| EP (1) | EP0885171B1 (en) |
| JP (1) | JP3889052B2 (en) |
| AT (1) | ATE207855T1 (en) |
| CA (1) | CA2247217C (en) |
| CZ (1) | CZ291148B6 (en) |
| DE (1) | DE69616600T2 (en) |
| DK (1) | DK0885171T3 (en) |
| EE (1) | EE03759B1 (en) |
| ES (1) | ES2167553T3 (en) |
| HU (1) | HU221778B1 (en) |
| NO (1) | NO315418B1 (en) |
| PL (1) | PL181119B1 (en) |
| PT (1) | PT885171E (en) |
| SK (1) | SK283505B6 (en) |
| WO (1) | WO1997030942A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6305878B1 (en) * | 2000-04-03 | 2001-10-23 | The United States Of America As Represented By The Secretary Of The Navy | Adjustable depth air sparging well |
| WO2004085319A1 (en) * | 2003-03-21 | 2004-10-07 | Subsurface Technologies, Inc. | Apparatus, method and system of treatment of arsenic and other impurities in ground water |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5551595Y2 (en) * | 1972-07-31 | 1980-12-01 | ||
| US5006250A (en) * | 1987-12-04 | 1991-04-09 | The Board Of Trustees Of The Leland Stanford Junior University | Pulsing of electron donor and electron acceptor for enhanced biotransformation of chemicals |
| SE466851B (en) | 1990-07-04 | 1992-04-13 | Paref Ab | PROCEDURE AND DEVICE FOR PURIFICATION OF WATER IN GROUNDWATER CONDUCTING STORES |
| US5246309A (en) * | 1991-05-16 | 1993-09-21 | Hobby Michael M | System and method for decontamination of contaminated ground |
| US5885775A (en) * | 1996-10-04 | 1999-03-23 | Perseptive Biosystems, Inc. | Methods for determining sequences information in polynucleotides using mass spectrometry |
-
1996
- 1996-02-21 AT AT96909410T patent/ATE207855T1/en active
- 1996-02-21 PT PT96909410T patent/PT885171E/en unknown
- 1996-02-21 EP EP96909410A patent/EP0885171B1/en not_active Expired - Lifetime
- 1996-02-21 JP JP53004197A patent/JP3889052B2/en not_active Expired - Fee Related
- 1996-02-21 EE EE9800258A patent/EE03759B1/en unknown
- 1996-02-21 PL PL96328490A patent/PL181119B1/en unknown
- 1996-02-21 SK SK1153-98A patent/SK283505B6/en not_active IP Right Cessation
- 1996-02-21 ES ES96909410T patent/ES2167553T3/en not_active Expired - Lifetime
- 1996-02-21 DK DK96909410T patent/DK0885171T3/en active
- 1996-02-21 US US09/125,613 patent/US6174107B1/en not_active Expired - Fee Related
- 1996-02-21 HU HU9903977A patent/HU221778B1/en not_active IP Right Cessation
- 1996-02-21 CZ CZ19982642A patent/CZ291148B6/en not_active IP Right Cessation
- 1996-02-21 WO PCT/SE1996/000238 patent/WO1997030942A1/en active IP Right Grant
- 1996-02-21 DE DE69616600T patent/DE69616600T2/en not_active Expired - Lifetime
- 1996-02-21 CA CA002247217A patent/CA2247217C/en not_active Expired - Lifetime
-
1998
- 1998-08-20 NO NO19983821A patent/NO315418B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| PT885171E (en) | 2002-04-29 |
| PL328490A1 (en) | 1999-02-01 |
| JP2000504628A (en) | 2000-04-18 |
| DK0885171T3 (en) | 2002-02-25 |
| HUP9903977A3 (en) | 2000-04-28 |
| EE9800258A (en) | 1999-02-15 |
| US6174107B1 (en) | 2001-01-16 |
| CZ264298A3 (en) | 1999-02-17 |
| SK283505B6 (en) | 2003-08-05 |
| CA2247217A1 (en) | 1997-08-28 |
| NO983821L (en) | 1998-08-20 |
| WO1997030942A1 (en) | 1997-08-28 |
| HU221778B1 (en) | 2003-01-28 |
| DE69616600T2 (en) | 2002-06-27 |
| DE69616600D1 (en) | 2001-12-06 |
| EP0885171A1 (en) | 1998-12-23 |
| ES2167553T3 (en) | 2002-05-16 |
| ATE207855T1 (en) | 2001-11-15 |
| JP3889052B2 (en) | 2007-03-07 |
| NO315418B1 (en) | 2003-09-01 |
| EE03759B1 (en) | 2002-06-17 |
| SK115398A3 (en) | 1999-06-11 |
| HUP9903977A2 (en) | 2000-03-28 |
| CZ291148B6 (en) | 2002-12-11 |
| PL181119B1 (en) | 2001-05-31 |
| NO983821D0 (en) | 1998-08-20 |
| EP0885171B1 (en) | 2001-10-31 |
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