WO1992000918A1 - A process for the purification of water - Google Patents

A process for the purification of water Download PDF

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Publication number
WO1992000918A1
WO1992000918A1 PCT/SE1991/000464 SE9100464W WO9200918A1 WO 1992000918 A1 WO1992000918 A1 WO 1992000918A1 SE 9100464 W SE9100464 W SE 9100464W WO 9200918 A1 WO9200918 A1 WO 9200918A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
wells
oxygen
tube
zone
Prior art date
Application number
PCT/SE1991/000464
Other languages
French (fr)
Inventor
Rudolf Håkan MARTINELL
Original Assignee
Paref Ab
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
Priority to JP91512393A priority Critical patent/JPH05508582A/en
Application filed by Paref Ab filed Critical Paref Ab
Priority to PL91297370A priority patent/PL168339B1/en
Priority to AU82260/91A priority patent/AU656898B2/en
Priority to KR1019920703378A priority patent/KR930701350A/en
Priority to CA002086523A priority patent/CA2086523C/en
Priority to SK4020-92A priority patent/SK278329B6/en
Priority to CS924020A priority patent/CZ281359B6/en
Priority to US07/962,218 priority patent/US5362400A/en
Publication of WO1992000918A1 publication Critical patent/WO1992000918A1/en
Priority to FI925987A priority patent/FI925987A0/en
Priority to LVP-92-640A priority patent/LV10420B/en
Priority to NO93930010A priority patent/NO930010L/en
Priority to BG97447A priority patent/BG60965B1/en

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
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C02F1/62—Heavy metal compounds
    • C02F1/64—Heavy metal compounds of iron or manganese
    • 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
    • B09C2101/00—In situ
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06—Contaminated groundwater or leachate

Definitions

  • the present invention relates to water purification, more particularly a process for creating, in an aquifer, an ox ⁇ idation and precipitation zone for in situ precipitation of substances in the ground water the content of which it is desired to decrease, or a reduction zone for the reduction of substances not desired in the ground water.
  • the Swedish patent specification 8206393-4 (corresponds to European patent specification 0160774) describes a process for decreasing the contents of iron and manganese in ground water flowing through an aquifer, wherein a "curtain-type" zone for the oxidation and precipitation of iron and manga ⁇ nese is created by intermittently introducing water contain ⁇ ing oxygen or oxygen-releasing substances through a number of injection wells arranged around one or more extraction wells for purified water. During each introduction of water containing oxygen or oxygen-releasing substances said water is fed to only some of the injection wells and simultaneous ⁇ ly water is drawn from nearby, adjacent or intervening in- jection wells.
  • the oxygen-containing water introduced cre ⁇ ates a suitable environment for certain bacteria so that these in combination with purely chemical processes will bring about precipitation of the iron and manganese in the existing ground layers which will thus serve as a filter.
  • the oxygen-containing water is added intermittently, e.g. for a period of about 24 hours.
  • the Swedish patent specification 8400190-8 (corresponds to European patent specification 0154105) describes a process for decreasing the content of nitrate in ground water by reducing the nitrate to nitrogen in a reduction zone (de- nitrification zone) created between a number of injection wells arranged around one or more extraction wells for puri ⁇ fied water.
  • Said reduction zone is formed in the same manner as the above described oxidation zone but water containing denitrification organisms and/or substrate therefore is fed to the injection wells instead of water containing oxygen or oxygen-releasing substances.
  • substrate oxygen-consuming substance
  • the invention relates to a process for creating, in an aquifer, an oxidation and precipitation zone between a number of injection wells ar ⁇ ranged around one or more extraction wells for purified water, which zone is intended for in situ precipitation of substances not desired in the ground water.
  • This process is characterized in that the zone desired is created intermit ⁇ tently between each pair of adjacent injection wells by (i) introducing oxygen, oxygen-containing gas or an oxygen- -releasing substance into the water in both wells and (ii) pumping the water in one well from below upwards while pumping the water in the other well from above downwards, whereby a circulation circuit is formed in the aquifer be ⁇ tween the two wells.
  • water will flow in through the lower part of the well strainer (or through one or more lower well strainers) and flow out through the upper part of the well strainer (or through one or more upper well strainers) .
  • water is pumped from above downwards. It may sometimes be appropriate to reverse the pumping direction in the two wells after a certain time.
  • oxygenation and circulation flow may be effected simul ⁇ taneously between two or more pairs of adjacent injection wells, if desired.
  • a reduction zone for the reduction of substances not desired in the ground water is created between a number of injection wells arranged around one or more extraction wells for puri ⁇ fied water by introducing an oxygen-consuming substance into the injection wells instead of oxygen, oxygen-containing gas or oxygen-releasing substance.
  • the necessary regeneration frequency for the zone between two specific injection wells is determined from case to case on the basis of the water flow between the wells and the water quality in the area in question. These data are determined in connection with the sinking of the injection wells. Also the suitable distance between adjacent injection wells is determined by means of the water flow, that is the hydraulic conductivity in different directions.
  • the invention is applicable not only in the precipitation of iron and manganese from the ground water but also in the precipitation of other undesired substances, e.g. aluminium and fluorine.
  • fluoride ions it is normal ⁇ ly necessary to introduce also calcium ions in suitable form into the precipitation zone via the injection wells.
  • an outer reduction zone e.g. for reducing nitrate
  • an inner oxidation zone e.g. for oxidizing and precipitating iron and manganese and for stripping ni ⁇ trogen gas formed in the reduction of nitrate
  • the invention also comprises a device for carrying out the process in a number of injection wells arranged around one or more extraction wells for purified water, which injection wells each comprises an outer tube, which at least at the ground-water-carrying portion of its length is apertured and water-pervious, and said device is distinguished sub ⁇ stantially in that approximately at the middle of said length portion is internally mounted sealingly and concen- trically by the intermedation of sealing means an inner tube member of smaller diameter and predetermined length, said tube member being closed at its upper end by a trans ⁇ versal wall with a central opening, from which extends up ⁇ wardly a distance an elongated tube, and in that an inner flow pipe extends from the upper end of the outer tube and downwardly to a position slightly below the upper end of the elongation tube, which flow pipe has a diameter which is smaller than that of the outer tube but greater than that of the elongation tube, conduits for supply of air to the area within and closest above, respectively, the tube member furthermore extending
  • FIG. 1 diagrammatically illustrates the circulation flow which can be provided according to the invention in the ground layer between pairs of adjacent injection wells and Fig. 2 illustrates in detail how an injection well might be supplied with air for flowing of water downwardly and up- wardly, respectively.
  • Fig. 1 it is thus illustrated a pair of adjacent injec ⁇ tion wells A and B.
  • the well B water is carried from be ⁇ low and upwardly, while in the well A water is carried from above and downwardly, the pattern of the flow lines illus- trated by the lines I-IV being obtained in the ground layer between the wells A and B and above and below, respectively, the circulation devices V.
  • the circulation devices V have been symbolically illustrated in Fig. 1 as a separate tube portion in each well, which might be provided with a preferably electrically driven pro- peller,' if desired. How such a tube portion thus might be designed is further illustrated in Fig. 2.
  • an outer tube 1 in an injection well A or B is at a posi ⁇ tion approximately in the middle between the bottom of the well and the ground-water surface concentrically mounted an inner tube member 3 with smaller diameter and predetermined length.
  • the outer tube 1 is at least over the greater part of the ground-water-carrying area of its length apertured and water-pervious and the inner tube member 3 is sealed against the inner wall of the tube 1 by means of suitable sealing means, such as inflatable sealing rings 2.
  • Adjacent its upper end said inner tube member 3 is closed by means of an angular wall 4, from the central opening of which extends upwardly an elongation tube 5.
  • an inner flow pipe 6 concen ⁇ trically in downward direction, which tube 6 suitably has a diameter which is greater than that of the elongation tube 5 but smaller than that of the inner tube member 3.
  • the lower portion of said pipe 6 is located slightly above the upper end of the tube member 3 but below the upper end of the elongation tube 5.
  • the outer tube 1 as well as the inner flow pipe 6 have at their upper end a de-airation device 9 known per se.
  • the water delivery capacity which e.g. the mammoth-pump or the propeller needs to have, can amount to e.g. between 0.1 and 15 1/sec dependent on the prerequisites and for a lift ⁇ ing height of for instance 5-15 m.
  • said substance When a solid or liquid oxygen-releasing or consuming sub ⁇ stance is to be introduced into the water in an injection well, said substance might be introduced either as such or in the form of a solution or a slurry in water, which is introduced in a suitable way into the tube member 3.
  • the method according to the invention is simpler than the method previously known and hence also essentially cheaper, particularly as to the installation costs. While in the previous method the injection wells had to have a diameter of e.g. about 125 mm for housing a submersible pump in the well, for which a heavy and powerful drilling equipment war required and the drilling costs thereby amounted to several thousand Swedish crowns per hole, in the present invention only a drilling hole diameter of about 50 mm is required, since only a smaller propeller need to be mounted within the well. For making such holes, a much simpler and com ⁇ pletely portable drilling equipment might be used and there ⁇ fore the manufacturing costs amount to only some hundred crowns per hole. Furthermore, no water pipes are required between the injection wells or between the latter and the extraction well and also no separate oxygenator station.

Abstract

The present invention refers to a process 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. The zone desired is created intermittently between each pair of adjacent injection wells by (i) introducing oxygen, oxygen-containing gas or an oxygen-releasing substance (or an oxygen-consuming substance) into the water in both wells and (ii) pumping the water in one well 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 wells. A device for carrying out said process comprises an outer tube (1), sealing means (2), an inner tube member (3), a transversal wall (4) with a central opening, an elongation tube (5), an inner flow pipe (6) and conduits (7, 8) for supply of air.

Description

A PROCESS FOR THE PURIFICATION OF WATER
The present invention relates to water purification, more particularly a process for creating, in an aquifer, an ox¬ idation and precipitation zone for in situ precipitation of substances in the ground water the content of which it is desired to decrease, or a reduction zone for the reduction of substances not desired in the ground water.
The Swedish patent specification 8206393-4 (corresponds to European patent specification 0160774) describes a process for decreasing the contents of iron and manganese in ground water flowing through an aquifer, wherein a "curtain-type" zone for the oxidation and precipitation of iron and manga¬ nese is created by intermittently introducing water contain¬ ing oxygen or oxygen-releasing substances through a number of injection wells arranged around one or more extraction wells for purified water. During each introduction of water containing oxygen or oxygen-releasing substances said water is fed to only some of the injection wells and simultaneous¬ ly water is drawn from nearby, adjacent or intervening in- jection wells. The oxygen-containing water introduced cre¬ ates a suitable environment for certain bacteria so that these in combination with purely chemical processes will bring about precipitation of the iron and manganese in the existing ground layers which will thus serve as a filter. The oxygen-containing water is added intermittently, e.g. for a period of about 24 hours.
The Swedish patent specification 8400190-8 (corresponds to European patent specification 0154105) describes a process for decreasing the content of nitrate in ground water by reducing the nitrate to nitrogen in a reduction zone (de- nitrification zone) created between a number of injection wells arranged around one or more extraction wells for puri¬ fied water. Said reduction zone is formed in the same manner as the above described oxidation zone but water containing denitrification organisms and/or substrate therefore is fed to the injection wells instead of water containing oxygen or oxygen-releasing substances. Normally only substrate (oxygen-consuming substance) is added, e.g. sucrose, me- thanol, ethanol, an acetate or molasses.
For the creation of such oxidation and reduction zones an extensive pipe system is required, e.g. for oxygenating water in an oxygenator station and pumping water to and from the injection wells. Moreover, said wells need to have a rather large diameter, e.g. about 125 mm for accomodating an submersible pump.
According to the present invention such oxidation and reduc¬ tion zones are created in a different and simpler manner. Thus, according to one embodiment the invention relates to a process for creating, in an aquifer, an oxidation and precipitation zone between a number of injection wells ar¬ ranged around one or more extraction wells for purified water, which zone is intended for in situ precipitation of substances not desired in the ground water. This process is characterized in that the zone desired is created intermit¬ tently between each pair of adjacent injection wells by (i) introducing oxygen, oxygen-containing gas or an oxygen- -releasing substance into the water in both wells and (ii) pumping the water in one well from below upwards while pumping the water in the other well from above downwards, whereby a circulation circuit is formed in the aquifer be¬ tween the two wells.
Thus, in the well wherein the water is pumped from below upwards water will flow in through the lower part of the well strainer (or through one or more lower well strainers) and flow out through the upper part of the well strainer (or through one or more upper well strainers) . The opposite is true for the well wherein the water is pumped from above downwards. It may sometimes be appropriate to reverse the pumping direction in the two wells after a certain time. Such oxygenation and circulation flow may be effected simul¬ taneously between two or more pairs of adjacent injection wells, if desired.
According to a modification of the process described above a reduction zone for the reduction of substances not desired in the ground water is created between a number of injection wells arranged around one or more extraction wells for puri¬ fied water by introducing an oxygen-consuming substance into the injection wells instead of oxygen, oxygen-containing gas or oxygen-releasing substance.
The necessary regeneration frequency for the zone between two specific injection wells is determined from case to case on the basis of the water flow between the wells and the water quality in the area in question. These data are determined in connection with the sinking of the injection wells. Also the suitable distance between adjacent injection wells is determined by means of the water flow, that is the hydraulic conductivity in different directions.
The invention is applicable not only in the precipitation of iron and manganese from the ground water but also in the precipitation of other undesired substances, e.g. aluminium and fluorine. When precipitating fluoride ions it is normal¬ ly necessary to introduce also calcium ions in suitable form into the precipitation zone via the injection wells.
Around one and the same extraction well it is also possible to create both an outer reduction zone (e.g. for reducing nitrate) and an inner oxidation zone (e.g. for oxidizing and precipitating iron and manganese and for stripping ni¬ trogen gas formed in the reduction of nitrate) .
The invention also comprises a device for carrying out the process in a number of injection wells arranged around one or more extraction wells for purified water, which injection wells each comprises an outer tube, which at least at the ground-water-carrying portion of its length is apertured and water-pervious, and said device is distinguished sub¬ stantially in that approximately at the middle of said length portion is internally mounted sealingly and concen- trically by the intermedation of sealing means an inner tube member of smaller diameter and predetermined length, said tube member being closed at its upper end by a trans¬ versal wall with a central opening, from which extends up¬ wardly a distance an elongated tube, and in that an inner flow pipe extends from the upper end of the outer tube and downwardly to a position slightly below the upper end of the elongation tube, which flow pipe has a diameter which is smaller than that of the outer tube but greater than that of the elongation tube, conduits for supply of air to the area within and closest above, respectively, the tube member furthermore extending from above and downwardly along the inside of the outer tube.
By way of example the invention will be further described below with reference to the accompanying drawing, in which Fig. 1 diagrammatically illustrates the circulation flow which can be provided according to the invention in the ground layer between pairs of adjacent injection wells and Fig. 2 illustrates in detail how an injection well might be supplied with air for flowing of water downwardly and up- wardly, respectively.
In Fig. 1 it is thus illustrated a pair of adjacent injec¬ tion wells A and B. In the well B water is carried from be¬ low and upwardly, while in the well A water is carried from above and downwardly, the pattern of the flow lines illus- trated by the lines I-IV being obtained in the ground layer between the wells A and B and above and below, respectively, the circulation devices V.
The circulation devices V have been symbolically illustrated in Fig. 1 as a separate tube portion in each well, which might be provided with a preferably electrically driven pro- peller,' if desired. How such a tube portion thus might be designed is further illustrated in Fig. 2.
In an outer tube 1 in an injection well A or B is at a posi¬ tion approximately in the middle between the bottom of the well and the ground-water surface concentrically mounted an inner tube member 3 with smaller diameter and predetermined length. The outer tube 1 is at least over the greater part of the ground-water-carrying area of its length apertured and water-pervious and the inner tube member 3 is sealed against the inner wall of the tube 1 by means of suitable sealing means, such as inflatable sealing rings 2. Adjacent its upper end said inner tube member 3 is closed by means of an angular wall 4, from the central opening of which extends upwardly an elongation tube 5. From the upper end of the outer tube 1 extends an inner flow pipe 6 concen¬ trically in downward direction, which tube 6 suitably has a diameter which is greater than that of the elongation tube 5 but smaller than that of the inner tube member 3. The lower portion of said pipe 6 is located slightly above the upper end of the tube member 3 but below the upper end of the elongation tube 5. For supply of air extend along the inside of the outer tube 1 on one hand a conduit 7, which opens into the tube member 3 and on the other a conduit 8, which opens into the gap between the flow pipe 6 and the elongation tube 5. The outer tube 1 as well as the inner flow pipe 6 have at their upper end a de-airation device 9 known per se.
When pumping water from below and upwardly air is thus sup¬ plied through the conduit 7, which provides for a upwardly directed flow of water centrally through the tube member 3 and the elongation tube 5 and more water is drawn into the lower strainer portion of the tube 1, compare B in Fig. 1. In the upper portion of the tube 1 which is slotted, water is forced upwardly to a level slightly above the initial ground water surface and outwardly into the ground layer, flow lines according to I in Fig. l being obtained in the direction towards the injection well A.
On the contrary, if water is to be pumped from above and downwardly, air is supplied through the conduit 8, a flow being caused upwardly along the outside of the elongation tube 5 and downwardly at the inside of said tube and further downwardly within the tubes 3 and 1. Thereby flow lines II and III in Fig. 1 arise, i.e. water penetrates into the upper portion of the tube 1 and is expelled from the lower portion of the same tube. It is only for greater level dif- ferences and pumping heights that an auxiliary mechanical pumping device 10 is required, in such case located within the tube member 3, such as outlined in the drawing. As pump¬ ing device might in such cases be used for instance a smaller electrically driven propeller or impeller with re- versible rotational direction. It is also possible to use a small pump driven by an electrical motor and located in a superstructure of the well or an ejector device or any other device well-known to the artisan.
The water delivery capacity which e.g. the mammoth-pump or the propeller needs to have, can amount to e.g. between 0.1 and 15 1/sec dependent on the prerequisites and for a lift¬ ing height of for instance 5-15 m.
When a solid or liquid oxygen-releasing or consuming sub¬ stance is to be introduced into the water in an injection well, said substance might be introduced either as such or in the form of a solution or a slurry in water, which is introduced in a suitable way into the tube member 3.
The method according to the invention is simpler than the method previously known and hence also essentially cheaper, particularly as to the installation costs. While in the previous method the injection wells had to have a diameter of e.g. about 125 mm for housing a submersible pump in the well, for which a heavy and powerful drilling equipment war required and the drilling costs thereby amounted to several thousand Swedish crowns per hole, in the present invention only a drilling hole diameter of about 50 mm is required, since only a smaller propeller need to be mounted within the well. For making such holes, a much simpler and com¬ pletely portable drilling equipment might be used and there¬ fore the manufacturing costs amount to only some hundred crowns per hole. Furthermore, no water pipes are required between the injection wells or between the latter and the extraction well and also no separate oxygenator station.

Claims

1. A process for creating, in an aquifer, an oxidation and precipitation 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 of substances not desired in the ground water, c h a r a c ¬ t e r i z e d i n that the zone desired is created inter¬ mittently between each pair of adjacent injection wells by (i) introducing oxygen, oxygen-containing gas or an oxygen- -releasing substance into the water in both wells and (ii) pumping the water in one well from below upwards while pump¬ ing the water in the other well from above downwards, where¬ by a circulation circuit is formed in the aquifer between the two wells.
2. Modification of the process according to claim 1, wherein a reduction zone for the reduction of substances not desired in the ground water is created between a number of injection wells arranged around one or more extraction wells for purified water by introducing an oxygen-consuming substance into the injection wells instead of oxygen, oxy¬ gen-containing gas or oxygen-releasing substance.
3. A device for carrying out the process according to claim 1 or 2 in a number of injection wells arranged around one or more extraction wells for purified water, which in- jection wells each comprises an outer tube (1) , which at least at the ground-water-carrying portion of its length is apertured and water-pervious, c h a r a c t e r i z e d i n that approximately at the middle of said length por¬ tion is internally mounted sealingly and concentrically by the intermediation of sealing means (2) an inner tube member
(3) of smaller diameter and predetermined length, said tube member being closed at its upper end by a transversal wall
(4) with a central opening, from which extends upwardly a distance an elongation tube (5) , and in that an inner flow pipe (6) extends from the upper end of the outer tube (1) and downwardly to a position slightly below the upper end of the elongation tube (5) , which flow pipe (6) has a dia¬ meter which is smaller than that of the outer tube (1) but greater than that of the elongation tube (5) , conduits (7, 8) for supply of air to the area within and closest above, respectively, the tube member (3) furthermore extend¬ ing from above and downwardly along the inside of the outer tube (1) .
4. A device according to claim 3, c h a r a c t e r ¬ i z e d i n that within the tube member (3) is arranged an auxiliary pumping device (10) for amplification of the de¬ sired flow of water upwardly or downwardly.
PCT/SE1991/000464 1990-07-04 1991-06-26 A process for the purification of water WO1992000918A1 (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
SK4020-92A SK278329B6 (en) 1990-07-04 1991-06-26 Method of the water purification and device for carrying out the method
PL91297370A PL168339B1 (en) 1990-07-04 1991-06-26 Method of and apparatus for purifying water
AU82260/91A AU656898B2 (en) 1990-07-04 1991-06-26 A process for the purification of water
KR1019920703378A KR930701350A (en) 1990-07-04 1991-06-26 Water Purification Method
CA002086523A CA2086523C (en) 1990-07-04 1991-06-26 Process for the purification of water
JP91512393A JPH05508582A (en) 1990-07-04 1991-06-26 How to purify water
CS924020A CZ281359B6 (en) 1990-07-04 1991-06-26 Water treatment process and apparatus for making the same
US07/962,218 US5362400A (en) 1990-07-04 1991-06-26 Process for the purification of water
FI925987A FI925987A0 (en) 1990-07-04 1992-12-31 VATTENRENGOERINGSPROCESS
LVP-92-640A LV10420B (en) 1990-07-04 1992-12-31 A process for the purification of water
NO93930010A NO930010L (en) 1990-07-04 1993-01-04 PROCEDURES FOR WATER CLEANING
BG97447A BG60965B1 (en) 1990-07-04 1993-02-15 Method and device for ground water treatment

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9002355-7 1990-07-04
SE9002355A SE466851B (en) 1990-07-04 1990-07-04 PROCEDURE AND DEVICE FOR PURIFICATION OF WATER IN GROUNDWATER CONDUCTING STORES

Publications (1)

Publication Number Publication Date
WO1992000918A1 true WO1992000918A1 (en) 1992-01-23

Family

ID=20379948

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1991/000464 WO1992000918A1 (en) 1990-07-04 1991-06-26 A process for the purification of water

Country Status (16)

Country Link
US (1) US5362400A (en)
JP (1) JPH05508582A (en)
KR (1) KR930701350A (en)
AU (1) AU656898B2 (en)
BG (1) BG60965B1 (en)
CA (1) CA2086523C (en)
CZ (1) CZ281359B6 (en)
FI (1) FI925987A0 (en)
HU (1) HUT64282A (en)
LT (1) LT3475B (en)
LV (1) LV10420B (en)
NO (1) NO930010L (en)
PL (1) PL168339B1 (en)
SE (1) SE466851B (en)
SK (1) SK278329B6 (en)
WO (1) WO1992000918A1 (en)

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DE4226871C1 (en) * 1992-08-11 1994-01-27 Hydrotec Ges Zur Aufbereitung Water extn. system with water treatment in aquifer - allows addn. of further wells and has long service life
WO1997030942A1 (en) * 1996-02-21 1997-08-28 Vyrmetoder Ab A device for creation of an oxidation and precipitation zone or a reduction zone in an aquifer

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US6306296B1 (en) * 1995-05-05 2001-10-23 William B. Kerfoot Groundwater and soil remediation with microporous diffusion apparatus
US5855775A (en) 1995-05-05 1999-01-05 Kerfoot; William B. Microporous diffusion apparatus
US5698092A (en) * 1995-08-07 1997-12-16 Chen; Youzhi In-situ oxidizing zone remediation system for contaminated groundwater
US5888021A (en) * 1995-12-19 1999-03-30 Canon Kabushiki Kaisha Method and apparatus for remediation of contaminated soil
CA2184566A1 (en) * 1996-02-27 1997-08-28 John L. Kiest Underground contamination in situ treatment system
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CN1104382C (en) * 1997-08-20 2003-04-02 维尔梅托德公司 Device for creation of oxidation and pptn. zone or reduction zone in aquifer
US6268205B1 (en) 1998-05-04 2001-07-31 Biomanagement Services, Inc. Subsurface decontamination method
WO1999058239A1 (en) * 1998-05-14 1999-11-18 U.S. Environmental Protection Agency Contaminant adsorption and oxidation via the fenton reaction
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PL297370A1 (en) 1992-07-13
HU9300003D0 (en) 1993-06-28
LTIP417A (en) 1994-10-25
LV10420A (en) 1995-02-20
FI925987A (en) 1992-12-31
KR930701350A (en) 1993-06-11
CZ281359B6 (en) 1996-09-11
LV10420B (en) 1995-06-20
SK278329B6 (en) 1996-11-06
AU8226091A (en) 1992-02-04
SE466851B (en) 1992-04-13
NO930010L (en) 1993-02-19
US5362400A (en) 1994-11-08
BG60965B1 (en) 1996-07-31
CA2086523C (en) 2002-08-27
JPH05508582A (en) 1993-12-02
PL168339B1 (en) 1996-02-29
CA2086523A1 (en) 1992-01-05
CZ402092A3 (en) 1993-09-15
BG97447A (en) 1994-03-24
AU656898B2 (en) 1995-02-23
SE9002355L (en) 1992-01-05
SK402092A3 (en) 1993-07-07
NO930010D0 (en) 1993-01-04
FI925987A0 (en) 1992-12-31
HUT64282A (en) 1993-12-28
SE9002355D0 (en) 1990-07-04
LT3475B (en) 1995-10-25

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