WO1989005778A1 - Method for cleaning contaminated grounds and plant for carrying out the method - Google Patents
Method for cleaning contaminated grounds and plant for carrying out the method Download PDFInfo
- Publication number
- WO1989005778A1 WO1989005778A1 PCT/DK1988/000212 DK8800212W WO8905778A1 WO 1989005778 A1 WO1989005778 A1 WO 1989005778A1 DK 8800212 W DK8800212 W DK 8800212W WO 8905778 A1 WO8905778 A1 WO 8905778A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pipe system
- plant
- water
- distribution pipe
- reverse osmosis
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
Definitions
- the present invention relates to a method for cleaning contaminated grounds comprising: providing the contaminated ground, on or ajacent the surface, with a distribution pipe system and providing, ajacent the distribution pipe system, one or more well-bore or bores having a depth so as to extend down to or below the contaminated stratum or strata of earth, pumping water up from the well-bore or bores and purifying the water, whereinafter the purified water or a part thereof is fed to the distribution pipe system for recirculation.
- the present invention builds upon the realization that if a purification by means of reverse osmosis is conbined with a biological purification, it is possible to achieve a technically advantageous result. Accordingly, the method according to the present invention is char ⁇ acterized by purifying the pumped water by reverse osmosis and subjecting the concentrate from the reverse osmosis purification to biological purification.
- an effective and cheap purification of the water in question is achieved because the reverse osmosis results in an increased concentration of the contaminations in the concentrate and according to experience upon which the present invention is built, it has been proven that even if the content of contaminations in this concentrate is very high, it is nevertheless possible to break down the concentrate biologically.
- the biological purification may be made by means of the active sludge method but it is also possible to carry out the biological purification by means of the method using the fluidized bed method.
- biological purification according to the active sludge method has proved to be advantageous.
- the present invention builds upon the realization that even if the concentrate from the reverse osmosis purification has a high content of contamination substances, a propagation or an adaptation or production of the micro-organism cultures, capable of breaking down the substances in question biologically, nevertheless will occur.
- This realization may furthermore be utilized according to the present invention, viz. by seeding the water fed to the distribution pipe system with micro ⁇ organisms from the micro-organism culture resulting from the biological purification.
- micro-organisms are fed to the stratum or strata to be cleaned, and such micro-organisms are, in particular, suitable for the breaking down of the impurities in the stratum or strata concerned, and already during the seeping of the water into the contaminated stratum or strata an initial biological breaking down of the contaminating substances will occur.
- the present invention also relates to an appropriate plant for carrying out the method in question comprising: a distribution pipe system for positioning on or ajacent the surface of the ground to be cleaned, means for pumping water up from one or more well-bore/bores provided ajacent the distribution pipe system and means for purifying the pumped water before conducting it to the distribution pipe system.
- the plant is characterized by: the means for purifying the water being constituted by a plant for reverse osmosis which is connectable with the well-bore or bores, the plant for reverse osmosis being connectable with a container for biological purification in the form of a tank arrangable upon the earth for feeding the concentrate resulting from the reverse osmosis purification to the tank, the plant for reverse osmosis furthermore being connectable with the distribution pipe system for conducting the water purified by reverse osmosis to the distribution pipe system.
- the sludge outlet from the tank may be connected with the distribu ⁇ tion pipe system for transferring a part of the sludge to the distribution pipe system.
- a buffer container for the concentrate may be insertable between the plant for reverse osmosis and the tank for biological purification.
- fig. 1 very schematically shows a section through a ground to be cleaned
- fig. 2 shows a flow-sheet illustrating an embodiment of the method according to the present invention and an embodiment of a plant for carrying out the method.
- 1 designates a contaminated ground.
- ground may e.g. be a ground where a gas works or another kind of contaminating industry previously has been positioned or the ground may constitute an area which has been used for depositing chemicals.
- 2 designates a well-bore which extends down below the contaminated stratum or strata and is provided with pump means (not shown) for pumping water up from the liner of the well to a purification plant 3. The pumped water is purified in the plant 3 and the purified water is conducted to the ground 1 as indicated by means of arrows.
- fig. 1 serves for illustrating the principle known per se used for "in situ" cleaning of contaminated grounds.
- 1 designates the ground in question to be cleaned.
- 4 designates a distribution pipe system to be arranged on or ajacent the surface of the ground 1 to be cleaned.
- the pipe system in question may e.g. consist of porous or perforated pipes e.g. in the form of drain pipes which, however, in the present instance do not serve for draining but, on the contrary, for feeding water to the earth to be cleaned.
- 5,6 and 7 designate three well-bores corresponding to the well-bore 2, fig. 1.
- the three well-bores are provided with pump means (not shown) for pumping up water of which at least a part originates from the water previously seeped into the ground from the distribution pipe system 4.
- 8 designates an equalization container which receives water from the three well-bores 5,6 and 7 which, similar to the bore 2 in fig. 1, extend down below the contaminated stratum or strata of earth.
- the equalization container 8 is connected with a plant 9 for reverse osmosis wherein the water, pumped up from the wells, is subjected to an up-concentration in a way known per se. Via a concentrate container 10 which also serves as a buffer container, the plant " 9 is connected with a plant for biological purification 11.
- the plant for biological purification may e.g. be of the kind which works with fluidized bed i.e. the concentrate arriving from the container 10 is pumped into the bottom of the container in question whereby e.g. sand, which constitutes the fluidized bed, is whirled up and micro-organism cultures are formed on the sand which is capable of producing a biological breaking down of the impurities in the concentrate, in such a way that purified water and sludge result.
- the plant for biological purification may also be adapted for biological purification by the active sludge method and if this is the case, the plant may, in a way known per se, be divided into an active part and a clarification part from which sludge is returned to the active part.
- the purified water is conducted from the plant 11 to an aerated filtrate container 12 through a pipe conduit 13, and from the container 12 the aerated water is via a conduit 15 fed to the distribution pipe system 4 in case it is wanted to use this water for the washing of the ground.
- the plant for reverse osmosis 9 is by means of a pipe conduit 14 connected with the container 12 for aerating the water purified in the plant 9 and the purified water is, after having passed the container 12, conducted to the distri ⁇ bution pipe system via the pipe conduit 15.
- Surplus water, if any, from the plant for reverse osmosis 9 and from the aerated filtrate container 12 may via pipe conduits 17 and 18 be fed to a sewerage 20.
- the sludge may by means of a valve 23 be conducted to the return conduit 15 via the aeration container 12 in order to be broken up by means of the agitator in the container 12.
- the plant shown operates in the following way:
- the flow of concentrate to the biological purification plant 11 may be controlled during the operation of the plant, in order to optimize the conditions for the micro-organisms in the plant 11.
- control may also be achieved by adjusting the plant 9 for reverse osmosis, in a way known per se, in such a way that the concentration of impurities in the concentrate corresponds to the optimum conditions in the biological purification plant 11.
- the concentrate contai ⁇ ner 10 may when starting the plant be used for accomodating the major part of the concentrate whereas only a small part is fed to the biological purification plant 11 in order to achieve propagation or adaptation or formation of the micro-organism cultures aimed at.
- the plant 11 may be constituted by a comparatively small tank which may be arranged upon the surface of the earth whereby the tank in question, when a ground has been cleaned, may be used for cleaning another ground. Furthermore, it will be understood that the plant for reverse osmosis also may be arranged upon the surface of the earth and the same applies as regards the other container components of the plant.
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- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
A method serves for cleaning contaminated grounds (1). Adjacent the surface of the contaminated ground (1), a distribution pipe system (4) is arranged and adjacent to this system one or more well-bores is/are provided. The well-bores have a depth which extends down below the contaminated earth. From the well-bores (5, 6, 7) water is pumped up, whereafter the purified water is fed to the distribution pipe system (4) for recirculation. In order to achieve a cleaning of the ground as good as possible and an amount of remaining impurities to be removed, as small as possible, the water pumped up is at first subjected to reverse osmosis, whereafter the concentrate from the purification by means of reverse osmosis, is subjected to a biological purification.
Description
METHOD FOR CLEANING CONTAMINATED GROUNDS AND PLANT FOR CARRYING OUT THE METHOD.
The present invention relates to a method for cleaning contaminated grounds comprising: providing the contaminated ground, on or ajacent the surface, with a distribution pipe system and providing, ajacent the distribution pipe system, one or more well-bore or bores having a depth so as to extend down to or below the contaminated stratum or strata of earth, pumping water up from the well-bore or bores and purifying the water, whereinafter the purified water or a part thereof is fed to the distribution pipe system for recirculation.
According to methods of the kind referred to above, it has been proposed to purify the water pumped from the well or wells before returning the water to the distribution pipe system by conducting the water in question through filters containing active carbon. However, such method has proved to be very expensive.
Furthermore, it has been proposed to purify the water pumped from the well or wells before it is fed to the distribution pipe system by subjecting the water to reverse osmosis. By such process the contaminated water which contains contaminations from the ground may be purified to such an extent that approximately 95% of the water may be recirculated but, in return, the removal of the concentrate causes diffficulties. However, the concentrate may be transferred to plants adapted to destroy such concentrates but also this solution is expensive.
Furthermore, it has been tried to purify the water in question by means of biological purification. However, problems have arisen because the concentrations of substances are or become so small during the purification period that no micro-organism culture can be propagated, which destroys the substances.
The present invention builds upon the realization that if a purification by means of reverse osmosis is conbined with a biological purification, it is possible to achieve a technically advantageous result.
Accordingly, the method according to the present invention is char¬ acterized by purifying the pumped water by reverse osmosis and subjecting the concentrate from the reverse osmosis purification to biological purification. By means of such method an effective and cheap purification of the water in question is achieved because the reverse osmosis results in an increased concentration of the contaminations in the concentrate and according to experience upon which the present invention is built, it has been proven that even if the content of contaminations in this concentrate is very high, it is nevertheless possible to break down the concentrate biologically. Presumably, this is due to the fact that during the biological purification and, in particular, if the concentrate is subjected to such biological purification in a heated condition, the micro-organisms capable of breaking down the contaminating substances biologically are produced or cultivated. In this connection it should be mentioned that mainly the breaking down of aromatic compositions, in particular in the form of carbon hydrides and tar substances, are concerned when gas works grounds are to be cleaned. However, the method according to the present invention may also be used in connection with cleaning other grounds, e.g. areas where chemical waste materials have been deposited.
According to the present invention the biological purification may be made by means of the active sludge method but it is also possible to carry out the biological purification by means of the method using the fluidized bed method. In particular biological purification according to the active sludge method has proved to be advantageous.
As previously mentioned, the present invention builds upon the realization that even if the concentrate from the reverse osmosis purification has a high content of contamination substances, a propagation or an adaptation or production of the micro-organism cultures, capable of breaking down the substances in question biologically, nevertheless will occur. This realization may furthermore be utilized according to the present invention, viz. by seeding the water fed to the distribution pipe system with micro¬ organisms from the micro-organism culture resulting from the
biological purification. By doing so, it is achieved that adapted or propagated or cultivated micro-organisms are fed to the stratum or strata to be cleaned, and such micro-organisms are, in particular, suitable for the breaking down of the impurities in the stratum or strata concerned, and already during the seeping of the water into the contaminated stratum or strata an initial biological breaking down of the contaminating substances will occur.
The present invention also relates to an appropriate plant for carrying out the method in question comprising: a distribution pipe system for positioning on or ajacent the surface of the ground to be cleaned, means for pumping water up from one or more well-bore/bores provided ajacent the distribution pipe system and means for purifying the pumped water before conducting it to the distribution pipe system. According to the present invention, the plant is characterized by: the means for purifying the water being constituted by a plant for reverse osmosis which is connectable with the well-bore or bores, the plant for reverse osmosis being connectable with a container for biological purification in the form of a tank arrangable upon the earth for feeding the concentrate resulting from the reverse osmosis purification to the tank, the plant for reverse osmosis furthermore being connectable with the distribution pipe system for conducting the water purified by reverse osmosis to the distribution pipe system.
For seeding the purified water recirculated to the distribution system with micro-organisms from the tank for biolocal purification, the sludge outlet from the tank may be connected with the distribu¬ tion pipe system for transferring a part of the sludge to the distribution pipe system.
In order to be able to control the load of the tank for biological purification, a buffer container for the concentrate may be insertable between the plant for reverse osmosis and the tank for biological purification.
The invention will hereinafter be further explained with reference to the drawing, on which:
fig. 1 very schematically shows a section through a ground to be cleaned, and
fig. 2 shows a flow-sheet illustrating an embodiment of the method according to the present invention and an embodiment of a plant for carrying out the method.
On the drawing, 1 designates a contaminated ground. Such ground may e.g. be a ground where a gas works or another kind of contaminating industry previously has been positioned or the ground may constitute an area which has been used for depositing chemicals. 2 designates a well-bore which extends down below the contaminated stratum or strata and is provided with pump means (not shown) for pumping water up from the liner of the well to a purification plant 3. The pumped water is purified in the plant 3 and the purified water is conducted to the ground 1 as indicated by means of arrows.
Accordingly, fig. 1 serves for illustrating the principle known per se used for "in situ" cleaning of contaminated grounds.
On fig. 2, 1 designates the ground in question to be cleaned. 4 designates a distribution pipe system to be arranged on or ajacent the surface of the ground 1 to be cleaned. The pipe system in question may e.g. consist of porous or perforated pipes e.g. in the form of drain pipes which, however, in the present instance do not serve for draining but, on the contrary, for feeding water to the earth to be cleaned.
5,6 and 7 designate three well-bores corresponding to the well-bore 2, fig. 1. The three well-bores are provided with pump means (not shown) for pumping up water of which at least a part originates from the water previously seeped into the ground from the distribution pipe system 4. 8 designates an equalization container which receives water from the three well-bores 5,6 and 7 which, similar to the bore 2 in fig. 1, extend down below the contaminated stratum or strata of earth. The equalization container 8 is connected with a plant 9 for reverse osmosis wherein the water, pumped up from the wells, is subjected to an up-concentration in a way known per se. Via a
concentrate container 10 which also serves as a buffer container, the plant"9 is connected with a plant for biological purification 11.
The plant for biological purification may e.g. be of the kind which works with fluidized bed i.e. the concentrate arriving from the container 10 is pumped into the bottom of the container in question whereby e.g. sand, which constitutes the fluidized bed, is whirled up and micro-organism cultures are formed on the sand which is capable of producing a biological breaking down of the impurities in the concentrate, in such a way that purified water and sludge result. However, the plant for biological purification may also be adapted for biological purification by the active sludge method and if this is the case, the plant may, in a way known per se, be divided into an active part and a clarification part from which sludge is returned to the active part. No matter what plant is concerned, the purified water is conducted from the plant 11 to an aerated filtrate container 12 through a pipe conduit 13, and from the container 12 the aerated water is via a conduit 15 fed to the distribution pipe system 4 in case it is wanted to use this water for the washing of the ground. The plant for reverse osmosis 9 is by means of a pipe conduit 14 connected with the container 12 for aerating the water purified in the plant 9 and the purified water is, after having passed the container 12, conducted to the distri¬ bution pipe system via the pipe conduit 15. Surplus water, if any, from the plant for reverse osmosis 9 and from the aerated filtrate container 12 may via pipe conduits 17 and 18 be fed to a sewerage 20.
According to the embodiment shown on the drawing, it is possible to seed the water returned to the distribution pipe system 4 with sludge from the container 11, because a conduit 22 is branched-off from the sludge outlet 21 from the container 11 and the conduit 22 is connected with the return conduit 15 in such a way that a part of the sludge may be fed to the distribution pipe system. If requested, the sludge may by means of a valve 23 be conducted to the return conduit 15 via the aeration container 12 in order to be broken up by means of the agitator in the container 12.
The plant shown operates in the following way:
By pumping up water from the three well-bores 5,6 and 7 first of all water, which has been fed to the ground 1 by means of the distribu¬ tion pipe system 4, will be pumped and secondarily also ground water will be pumped up, as indicated by means of arrows 24 in fig. 2. Via the equalization container 8 the water pumped up is fed to the plant 9 for reverse osmosis. The concentrate from the plant 9 is fed to the container 10 and from there to the plant 11 for biological purification, whereafter the purified water via the aeration and filter container 12 is fed to the distribution pipe system 4, in such a way that the water in question is circulated through the ground 1.
Since more water than requested for recirculation may be aspirated due to the ground water flow towards the ground, marked by means of the arrows 24, such surplus water may either be conducted directly to the sewerage from the plant for reverse osmosis 9 or the surplus water in question may be conducted to the sewerage 20 after having passed the container 12.
By means of the concentration container 10, the flow of concentrate to the biological purification plant 11 may be controlled during the operation of the plant, in order to optimize the conditions for the micro-organisms in the plant 11. However, such control may also be achieved by adjusting the plant 9 for reverse osmosis, in a way known per se, in such a way that the concentration of impurities in the concentrate corresponds to the optimum conditions in the biological purification plant 11. Moreover, the concentrate contai¬ ner 10 may when starting the plant be used for accomodating the major part of the concentrate whereas only a small part is fed to the biological purification plant 11 in order to achieve propagation or adaptation or formation of the micro-organism cultures aimed at.
Due to the fact that the biological purification plant 11, accordingly, only has to treat comparatively small volumes, viz. the concentrate from the plant for reverse osmosis, the plant 11 may be constituted by a comparatively small tank which may be arranged upon
the surface of the earth whereby the tank in question, when a ground has been cleaned, may be used for cleaning another ground. Furthermore, it will be understood that the plant for reverse osmosis also may be arranged upon the surface of the earth and the same applies as regards the other container components of the plant.
Claims
1. Method for cleaning contaminated grounds comprising: providing the contaminated ground (1), on or ajacent the surface, with a distribution pipe system (4) and providing, ajacent the distribution pipe system, one or more well-bore or bores (5,6,7) having a depth so as to extend down to or below the contaminated stratum or strata of earth, pumping water up from the well-bore or bores (5,6,7) and purifying the water, whereinafter the purified water or a part thereof is fed to the distribution pipe system for recirculation, c h a r a c t e r i z e d by purifying the pumped water by reverse osmosis and subjecting the concentrate from the reverse osmosis purification to biological purification (at 11).
2. Method according to claim 1, c h a r a c t e r i z e d by using the active sludge method for the biological purification.
3. Method according to claim 1, c h a r a c t e r i z e d by using the fluidized bed method for the biological purification.
4. Method according to claim 1, c h a r a c t e r i z e d by conducting the biologically purified water to the distribution pipe system.
5. Method according to any of the beforegoing claims, c h a r a c ¬ t e r i z e d by oxidizing (at 12) the water fed to the distribu¬ tion pipe system (4).
6. Method according to any of the beforegoing claims, c h a r a c ¬ t e r i z e d by seeding the water fed to the distribution pipe system (4) with micro-organisms from the culture of micro-organisms resulting from the biological purification.
7. Plant for carrying out the method according to claim 1 comprising: a distribution pipe system (4) for positioning on or ajacent the surface of the ground (1) to be cleaned, means for pumping water up from one or more well-bore/bores (5,6,7) provided ajacent the distribution pipe system (4) and means for purifying the pumped water before conducting it to the distribution pipe system, c h a r a c t e r i z e d by the means for purifying the water being constituted by a plant (9) for reverse osmosis which is connectable with the well-bore or bores, the plant (9) for reverse osmosis being connectable with a container (11) for biological purification in the form of a tank arrangable upon the earth for feeding the concentrate resulting from the reverse osmosis purification to the tank, the plant (9) for reverse osmosis furthermore being connectable with the distribution pipe system (4) for conducting the water purified by reverse osmosis to the distri¬ bution pipe system (4).
8. Plant according to claim 7, c h a r a c t e r i z e d by the sludge outlet from the container (11) for biological purification being connectable with the distribution pipe system (4) for transferring a part of the sludge to the distribution pipe system (4).
9. Plant according to claim 7, c h a r a c t e r i z e d by a buffer container (10) for concentrate being inserted between the plant (9) for reverse osmosis and the tank (11) for biological purification.
10. Plant according to claim 7, c h a r a c t e r i z e d by the plant (9) for reverse osmosis and the plant (11) for biological purification being connected with the distribution pipe system (4) via an areated fitrate container (12).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK669987A DK669987D0 (en) | 1987-12-18 | 1987-12-18 | PROCEDURE FOR USE BY PURIFICATION OF POLLUTED LANDS AND PLANT FOR USE IN EXERCISE OF THE PROCEDURE |
| DK6699/87 | 1987-12-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1989005778A1 true WO1989005778A1 (en) | 1989-06-29 |
Family
ID=8148992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DK1988/000212 WO1989005778A1 (en) | 1987-12-18 | 1988-12-19 | Method for cleaning contaminated grounds and plant for carrying out the method |
Country Status (2)
| Country | Link |
|---|---|
| DK (1) | DK669987D0 (en) |
| WO (1) | WO1989005778A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991002565A1 (en) * | 1989-08-18 | 1991-03-07 | Terdekon Gmbh Erddekontaminierung | Process for purifying and processing contaminated materials |
| EP0493357A1 (en) * | 1990-12-21 | 1992-07-01 | Silt N.V. | Method for physico-chemically purifying contaminated sediments |
| DE4319992A1 (en) * | 1993-06-17 | 1994-12-22 | Berndt Kuehn | Process for the treatment of contaminated soils and device for carrying out the process |
| US5460723A (en) * | 1991-06-26 | 1995-10-24 | Omnium De Traitement Et De Valorrsation (Otv) S.A. | Surface water processing installation with safety barrier |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH456477A (en) * | 1966-09-09 | 1968-07-31 | Dorr Oliver Inc | Process for concentrating biological solids in a reaction system and biological reaction system for carrying out the process |
| DE2723132A1 (en) * | 1977-03-22 | 1978-09-28 | Sierre Sa Aquatech | DEVICE FOR CHEMICAL DECONTAMINATION OF SOIL AND / OR WATER INFESTED WITH ORGANIC SUBSTANCES |
| DE3009618A1 (en) * | 1979-03-30 | 1980-10-02 | Wyoming Mineral Corp | PROCESS FOR GROUNDWATER RESTORATION |
| EP0155768A2 (en) * | 1984-02-21 | 1985-09-25 | Foster Wheeler Energy Corporation | Contamination removal system and method |
| DE3505651A1 (en) * | 1985-02-19 | 1986-08-21 | Metallgesellschaft Ag, 6000 Frankfurt | Process for removing nitrate from ground water |
| EP0192285A1 (en) * | 1985-02-15 | 1986-08-27 | Heidemij Uitvoering B.V. | Method and system for biological reconditioning of contaminated soil |
| EP0228626A1 (en) * | 1985-12-20 | 1987-07-15 | DECHEMA Deutsche Gesellschaft für Chemisches Apparatewesen, Chemische Technik und Biotechnologie e.V. | Process for the decontamination of soil by means of micro-organisms |
| DE3601979A1 (en) * | 1986-01-21 | 1987-07-23 | Lfu Labor Fuer Umweltanalytik | Process for the biotechnological recovery of environmentally damaged soil |
-
1987
- 1987-12-18 DK DK669987A patent/DK669987D0/en not_active Application Discontinuation
-
1988
- 1988-12-19 WO PCT/DK1988/000212 patent/WO1989005778A1/en unknown
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH456477A (en) * | 1966-09-09 | 1968-07-31 | Dorr Oliver Inc | Process for concentrating biological solids in a reaction system and biological reaction system for carrying out the process |
| DE2723132A1 (en) * | 1977-03-22 | 1978-09-28 | Sierre Sa Aquatech | DEVICE FOR CHEMICAL DECONTAMINATION OF SOIL AND / OR WATER INFESTED WITH ORGANIC SUBSTANCES |
| DE3009618A1 (en) * | 1979-03-30 | 1980-10-02 | Wyoming Mineral Corp | PROCESS FOR GROUNDWATER RESTORATION |
| EP0155768A2 (en) * | 1984-02-21 | 1985-09-25 | Foster Wheeler Energy Corporation | Contamination removal system and method |
| EP0192285A1 (en) * | 1985-02-15 | 1986-08-27 | Heidemij Uitvoering B.V. | Method and system for biological reconditioning of contaminated soil |
| DE3505651A1 (en) * | 1985-02-19 | 1986-08-21 | Metallgesellschaft Ag, 6000 Frankfurt | Process for removing nitrate from ground water |
| EP0228626A1 (en) * | 1985-12-20 | 1987-07-15 | DECHEMA Deutsche Gesellschaft für Chemisches Apparatewesen, Chemische Technik und Biotechnologie e.V. | Process for the decontamination of soil by means of micro-organisms |
| DE3601979A1 (en) * | 1986-01-21 | 1987-07-23 | Lfu Labor Fuer Umweltanalytik | Process for the biotechnological recovery of environmentally damaged soil |
Non-Patent Citations (1)
| Title |
|---|
| DERWENT'S ABSTRACT NO. C80- C70 612; & JP,A,55 109 486. * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991002565A1 (en) * | 1989-08-18 | 1991-03-07 | Terdekon Gmbh Erddekontaminierung | Process for purifying and processing contaminated materials |
| EP0493357A1 (en) * | 1990-12-21 | 1992-07-01 | Silt N.V. | Method for physico-chemically purifying contaminated sediments |
| BE1004105A5 (en) * | 1990-12-21 | 1992-09-22 | Dredging Int | METHOD FOR PHYSICO-CHEMICAL PURIFICATION OF CONTAMINATED SPECIES. |
| US5460723A (en) * | 1991-06-26 | 1995-10-24 | Omnium De Traitement Et De Valorrsation (Otv) S.A. | Surface water processing installation with safety barrier |
| DE4319992A1 (en) * | 1993-06-17 | 1994-12-22 | Berndt Kuehn | Process for the treatment of contaminated soils and device for carrying out the process |
| WO1995000264A1 (en) * | 1993-06-17 | 1995-01-05 | Kuehn Berndt | Method of treating contaminated soil and a device for carrying out the method |
| DE4319992C2 (en) * | 1993-06-17 | 1998-12-03 | Berndt Kuehn | Process for the treatment of contaminated soils and device for carrying out the process |
Also Published As
| Publication number | Publication date |
|---|---|
| DK669987D0 (en) | 1987-12-18 |
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