CA2129727A1 - In-situ oxidizing zone remediation system for contaminated groundwater - Google Patents
In-situ oxidizing zone remediation system for contaminated groundwaterInfo
- Publication number
- CA2129727A1 CA2129727A1 CA002129727A CA2129727A CA2129727A1 CA 2129727 A1 CA2129727 A1 CA 2129727A1 CA 002129727 A CA002129727 A CA 002129727A CA 2129727 A CA2129727 A CA 2129727A CA 2129727 A1 CA2129727 A1 CA 2129727A1
- Authority
- CA
- Canada
- Prior art keywords
- gas
- aquifer
- plume
- groundwater
- contaminants
- 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.)
- Abandoned
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
- 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
- B09C1/005—Extraction of vapours or gases using vacuum or venting
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
-
- 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
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Biotechnology (AREA)
- General Health & Medical Sciences (AREA)
- Microbiology (AREA)
- Molecular Biology (AREA)
- Mycology (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention of in-situ oxidizing zone remediation system for contaminated groundwater is a system that releases oxygen or oxidizing gases into a saturated zone of an aquifer (3) to form an oxidizing zone (5) cross the contaminated groundwater plume (4) to purify the groundwater at the location of the plume so as to limit further development of the plume. The system comprises a set of gas injectors (7) embedded in a horizontal well, an oxidizing gas source (10), and gas flow rate controlling (19) and monitoring (20) devices. The gas will be injected through the gas injectors into the groundwater carrying contaminants at the rate that is approximately equal to the rate of the gas dissolving in the groundwater. Such rate will eliminate the possibility of secondary contaminant. A set of auxiliary apparatuses is also designed for preliminary examination before the installation of the system and for determining the suitable injecting rate of the gas.
Description
21~9~
In-Situ Oxidizing Zone Remediation System for Cont~minated Groundwater Field of the invention The invention for in-situ groundwater reme~liation relates to a system that releases oxygen or oxi~ ing gas(es) in an aquifer to form an oxidizing zone cross the cont~min~nt groundwater plume to purify the groundwater at the location of the plume so as to limit further development of the plume.
Discussion of Back~round and Prior Art The growth of population and of industrial and agricultural production since thesecond world war has begun to produce quantities of waste that are greater than that which the environment can easily absorb. Some data indicate that in the United States there are at least 17 million waste disposal facilities emplacing more than 6.5 billion cubic meters of liquid into the ground each year (US EPA, 1977). As time goes on, the vast groundwater reservoir of fresh water is gradually becoming degraded.
The polluted groundwater poses a serious environmental problem to both drinking water supply and general groundwater resource and is difficult to remedy. In general, most of the remediation methods involve removing the co~ irl~tion from the cont~min;~ted aquifer and/or groundwater and treating the cont~min:~te-l m~t~ after the remove. Except high cost of operation, those methods are inefficient because of the heterogeneity and complex structure of an aquifer. It is common that after spending years of time and thousands, even millions, dollars of money on remediation of a cont:~min~ted site, the aquifer and groundwater are still far from clean.
Under such circumstance, it is preferable to avoid all the removing process and treat the aquifer and groundwater in-situ whenever the cont~min~nt is treatable. Recent horizontal well drilling technology make the in-situ reme~ tion practically possible. Related U. S.
patent 4,593,760 and 4,660,639 describe a method by Visser, et. al. for removing volatile - 212972`7 cont~min~nt~ from the upper, unsaturated or "vadose" zone of the groundwater. Wells sunk vertically into the vadose zone may have a casing consisting two sections, an upper unperforated region and a lower perforated region. Volatile cont~min~ntc in the vadose zone enter the perforated casing and are pumped past the unperforated casing to the earth's surface for treatment. Furthermore, C~n~ n patent 1,308,649 characterizes a system and method by Corey, et. al. for stripping volatile cont~min~tion from groundwater, which comprise the use of horizontal wells for saturated zone or unsaturated zone injection of fluids that volatilize cont~min~nt.~ and extraction of those vol~tili7e~1 cont~min~nt~ to remedy cont:~min~terl groundwater.
None of these prior art is designed for non-volatile cont:lmin~tion nor for in-situ remediation that treats the cont~min~te~l groundwater and aquifer without extracting any cont~min~ted m~teri~l~ from the cont~min~ted site.
Introduction of the Invention It is a object of the present invention to provide a system and method for in-situ remediation of the groundwater and aquifer cont~min~te-l by oxidizable cont~min~ntc It is a further object of the present invention to provide a system and method for treating the groundwater carrying cont~min~nt without removing the groundwater from the aquifer and limiting further development of a plume of cont~min~te~l groundwater.
To achieve the objects and in accordance with the purpose of the invention, the invention comprises a gas source (10) connected with a gas injection system (7) embedded in a general horizontal well. The horizontal well is positioned below the plume of cont~min~te-l groundwater (4) and perpendicular with its çxtçn(ling direction (Figure 1). The gas source may include a main gas source (22) and several auxiliary gas sources (18). Depending on different cont~min~nts the groundwater carrying, the gas may be various oxidizing gas or gas lllib~ule, such as air, oxygen enriched air, oxygen, ozone or other oxidizing gas n~i~ule.
Furthermore, carbon dioxide or other gas also can be used to adjust the pH value of the groundwater. Each gas source has its own flowmeter (20) and flow control valve (19) to provide suitable gas mi,~ule. The gas or gas Il~L5lu~e is pressurized and driven through the ~12~7~7 injectors into the groundwater. Using such a system, the gas dissolved in the groundwater will produce an oxidizing zone (S) cross the conl~.nin~nt plume. The oxidizing zone will oxidize the organic co~ .--in~nt compounds in the groundwater passing through the oxidizing zone and yield a less cont~min~te,~l groundwater effluent (11).
The gas injection system comprises several short gas injectors connected with each other by flexible connecters (8). The short gas injectors and flexible connecters give the system deflectivity for installation in the horizontal well. To prevent the gas injectors from being twisted during the installation, the system is placed on a slide carriage (6). The gas injector further consists of two sets of gas tubing (13) and several separated injection chambers (14). Each set of the gas tubing poses a small penetrated hole (15) in every other chamber (Figure 2). The two sets of gas tubing provides two interlacing gas injector systems.
In case that one set of gas injectors is damaged, another set of gas injector system can still keep the system working.
The chambers (14) are covered by gas permeable porous ceramic shells (16). The porous shells (16) are capable of pass gas bubble of very small size (e.g. a few microns in diameter). With the shell, buoyant force of the gas bubble cannot exceeds the surface tension holding the bubbles to the aquifer medium In order to move upwardly, the gas bubble have to accnmul~te on the aquifer medium until its buoyant force exceeds the holding force. The accumulation process will provide the groundwater above the gas injectors enough time to dissolve the gas. When the gas releasing flow rate is approximately equal to the rate of the groundwater dissolving the gas and the total volume of the released gas at any given time interval is no more than the solubility of the gas in the cont~min~ted groundwater passing through the oxidizing zone (S) during the same period, the gas bubbles should remain in the cont~min~nt plume to preclude the gas from producing secondary pollution, which means that the gas bubbles strip volatile cont~min~nt from the cont~minz)nt plume and bear it upwardly to the upper part of clean groundwater and, the volatile cont~min~nt, then, is dissolved with the gas in the clean groundwater or release into atmosphere. Furthermore, the ceramic shell is capable of protesting the injector shell from erosion of oxidizing groundwater.
To prevent the system failed to decont~min~nt the groundwater after expensive installation of the system, a preliminary ex~min~tion procedure and a set of auxiliary 212972~
apparatuses are designed. It is an objective of the procedure and apparatuses to examine if the system can decont~min~te the given groundwater and aquifer. The apparatuses basically is a physical sim~ tion model of the con~ tecl aquifer and groundwater under theinfluence of the oxidizing zone formed by the gas injector system. It employs a pressure resistant sand receptacle (Figure 5) with a transparent top (28) and a gas injector (32), a pressure resistant vessel (Figure 6) with a piston (42) to separate the compricecl air from the water it contains, two flow rate control systems, one for water (23) and another for gas (24) respectively, and a few sampling ports (25). Both containers are made of the m~teri~l~ (36) that have no affinity with the organic compounds carried by the groundwater or at least have their inside surface covered by the m~tçri~ls.
The space between two sets of screens (26) in the sand receptacle is filled up by the m~teri~l~ of the cont:~min~te-l aquifer (3) which is directly taken from cont~min~nt field site within the cont~min:~nt groundwater plume or in periphery of the plume. The cont:~min~te~l groundwater will be directly exacted from the groundwater plume and pumped into the pressure resistant vessel as water source of the apparatuses. The control unit of water flow rate (23) can make the water passing through the sand receptacle in same velocity with Darcy velocity of the ambient flow of the conl~n~ nt groundwater in the aquifer. To ~im~ te the field situation closely, the apparatuses may have the pressure equivalent to the hydraulic head at the depth of the con~."il-~nt groundwater when comprised air is used in the upper chamber of the pressure resistant vessel (44). Under the circumstance, analysis of the sample taken from the sampling ports (25) will provide information that can be used to predict the remediation results after the system installed in the aquifer. In other words, the auxiliary apparatuses can be used to estimate how well the oxidizing zone created by a given gas or gas Illi~S~UlC purify the groundwater. Obviously, the same device also provides a useful tool to find suitable gas or gas n~i~lule that may oxidize the cont~min~ntc when the given gas or gas n~i~ule does not performance well.
The gas injecting flow rate can be also determined by the auxiliary apparatuses. By adjusting the flow control valve (38), the gas will be injected at an slowly increased rate until the gas bubbles is formed on top of the aquifer m~t-~ri~l (37) but not buoy up into the water.
Under the given condition, the gas injecting rate is equal to groundwater dissolving the gas in 2~29~27 ~ . ~ ......
the oxidizing zone and less than the solubility of the groundwater passing through the cross section of the receptacle. The actual gas releasing rate in the aquifer can be easily calculated from the ratio between the cross section area of the device and the cross section area of the plume. If the cont~min~nt plume covers significant thickness of the aquifer and the hydraulic head changes at different depth may influence the gas dissolving rate and solubility of the gas in the groundwater, it is preferable that different pressure is used in the test.
A Brief Description Of the Drawin~s The accompanying drawings, which are incorporated in and form a part of the specification, illustrate the invention and, together with the description, serve to explain the principles of the invention. In the drawings:
Figure 1 includes a top view and cross-sectional side view of an embodiment of the remediation system of the invention.
Figure 2 and Figure 3 are detaile~d cross-sectional side views of the gas injector.
Figure 4 is a schematic of gas source manifold.
Figure S illustrates detailed cross-sectional side views of the auxiliary apparatuses, schematic of gas source manifold, sampling ports and the flow rate control units.
Figure 6 is a schematic of cross section of the pressure resistant vessel.
In-Situ Oxidizing Zone Remediation System for Cont~minated Groundwater Field of the invention The invention for in-situ groundwater reme~liation relates to a system that releases oxygen or oxi~ ing gas(es) in an aquifer to form an oxidizing zone cross the cont~min~nt groundwater plume to purify the groundwater at the location of the plume so as to limit further development of the plume.
Discussion of Back~round and Prior Art The growth of population and of industrial and agricultural production since thesecond world war has begun to produce quantities of waste that are greater than that which the environment can easily absorb. Some data indicate that in the United States there are at least 17 million waste disposal facilities emplacing more than 6.5 billion cubic meters of liquid into the ground each year (US EPA, 1977). As time goes on, the vast groundwater reservoir of fresh water is gradually becoming degraded.
The polluted groundwater poses a serious environmental problem to both drinking water supply and general groundwater resource and is difficult to remedy. In general, most of the remediation methods involve removing the co~ irl~tion from the cont~min;~ted aquifer and/or groundwater and treating the cont~min:~te-l m~t~ after the remove. Except high cost of operation, those methods are inefficient because of the heterogeneity and complex structure of an aquifer. It is common that after spending years of time and thousands, even millions, dollars of money on remediation of a cont:~min~ted site, the aquifer and groundwater are still far from clean.
Under such circumstance, it is preferable to avoid all the removing process and treat the aquifer and groundwater in-situ whenever the cont~min~nt is treatable. Recent horizontal well drilling technology make the in-situ reme~ tion practically possible. Related U. S.
patent 4,593,760 and 4,660,639 describe a method by Visser, et. al. for removing volatile - 212972`7 cont~min~nt~ from the upper, unsaturated or "vadose" zone of the groundwater. Wells sunk vertically into the vadose zone may have a casing consisting two sections, an upper unperforated region and a lower perforated region. Volatile cont~min~ntc in the vadose zone enter the perforated casing and are pumped past the unperforated casing to the earth's surface for treatment. Furthermore, C~n~ n patent 1,308,649 characterizes a system and method by Corey, et. al. for stripping volatile cont~min~tion from groundwater, which comprise the use of horizontal wells for saturated zone or unsaturated zone injection of fluids that volatilize cont~min~nt.~ and extraction of those vol~tili7e~1 cont~min~nt~ to remedy cont:~min~terl groundwater.
None of these prior art is designed for non-volatile cont:lmin~tion nor for in-situ remediation that treats the cont~min~te~l groundwater and aquifer without extracting any cont~min~ted m~teri~l~ from the cont~min~ted site.
Introduction of the Invention It is a object of the present invention to provide a system and method for in-situ remediation of the groundwater and aquifer cont~min~te-l by oxidizable cont~min~ntc It is a further object of the present invention to provide a system and method for treating the groundwater carrying cont~min~nt without removing the groundwater from the aquifer and limiting further development of a plume of cont~min~te~l groundwater.
To achieve the objects and in accordance with the purpose of the invention, the invention comprises a gas source (10) connected with a gas injection system (7) embedded in a general horizontal well. The horizontal well is positioned below the plume of cont~min~te-l groundwater (4) and perpendicular with its çxtçn(ling direction (Figure 1). The gas source may include a main gas source (22) and several auxiliary gas sources (18). Depending on different cont~min~nts the groundwater carrying, the gas may be various oxidizing gas or gas lllib~ule, such as air, oxygen enriched air, oxygen, ozone or other oxidizing gas n~i~ule.
Furthermore, carbon dioxide or other gas also can be used to adjust the pH value of the groundwater. Each gas source has its own flowmeter (20) and flow control valve (19) to provide suitable gas mi,~ule. The gas or gas Il~L5lu~e is pressurized and driven through the ~12~7~7 injectors into the groundwater. Using such a system, the gas dissolved in the groundwater will produce an oxidizing zone (S) cross the conl~.nin~nt plume. The oxidizing zone will oxidize the organic co~ .--in~nt compounds in the groundwater passing through the oxidizing zone and yield a less cont~min~te,~l groundwater effluent (11).
The gas injection system comprises several short gas injectors connected with each other by flexible connecters (8). The short gas injectors and flexible connecters give the system deflectivity for installation in the horizontal well. To prevent the gas injectors from being twisted during the installation, the system is placed on a slide carriage (6). The gas injector further consists of two sets of gas tubing (13) and several separated injection chambers (14). Each set of the gas tubing poses a small penetrated hole (15) in every other chamber (Figure 2). The two sets of gas tubing provides two interlacing gas injector systems.
In case that one set of gas injectors is damaged, another set of gas injector system can still keep the system working.
The chambers (14) are covered by gas permeable porous ceramic shells (16). The porous shells (16) are capable of pass gas bubble of very small size (e.g. a few microns in diameter). With the shell, buoyant force of the gas bubble cannot exceeds the surface tension holding the bubbles to the aquifer medium In order to move upwardly, the gas bubble have to accnmul~te on the aquifer medium until its buoyant force exceeds the holding force. The accumulation process will provide the groundwater above the gas injectors enough time to dissolve the gas. When the gas releasing flow rate is approximately equal to the rate of the groundwater dissolving the gas and the total volume of the released gas at any given time interval is no more than the solubility of the gas in the cont~min~ted groundwater passing through the oxidizing zone (S) during the same period, the gas bubbles should remain in the cont~min~nt plume to preclude the gas from producing secondary pollution, which means that the gas bubbles strip volatile cont~min~nt from the cont~minz)nt plume and bear it upwardly to the upper part of clean groundwater and, the volatile cont~min~nt, then, is dissolved with the gas in the clean groundwater or release into atmosphere. Furthermore, the ceramic shell is capable of protesting the injector shell from erosion of oxidizing groundwater.
To prevent the system failed to decont~min~nt the groundwater after expensive installation of the system, a preliminary ex~min~tion procedure and a set of auxiliary 212972~
apparatuses are designed. It is an objective of the procedure and apparatuses to examine if the system can decont~min~te the given groundwater and aquifer. The apparatuses basically is a physical sim~ tion model of the con~ tecl aquifer and groundwater under theinfluence of the oxidizing zone formed by the gas injector system. It employs a pressure resistant sand receptacle (Figure 5) with a transparent top (28) and a gas injector (32), a pressure resistant vessel (Figure 6) with a piston (42) to separate the compricecl air from the water it contains, two flow rate control systems, one for water (23) and another for gas (24) respectively, and a few sampling ports (25). Both containers are made of the m~teri~l~ (36) that have no affinity with the organic compounds carried by the groundwater or at least have their inside surface covered by the m~tçri~ls.
The space between two sets of screens (26) in the sand receptacle is filled up by the m~teri~l~ of the cont:~min~te-l aquifer (3) which is directly taken from cont~min~nt field site within the cont~min:~nt groundwater plume or in periphery of the plume. The cont:~min~te~l groundwater will be directly exacted from the groundwater plume and pumped into the pressure resistant vessel as water source of the apparatuses. The control unit of water flow rate (23) can make the water passing through the sand receptacle in same velocity with Darcy velocity of the ambient flow of the conl~n~ nt groundwater in the aquifer. To ~im~ te the field situation closely, the apparatuses may have the pressure equivalent to the hydraulic head at the depth of the con~."il-~nt groundwater when comprised air is used in the upper chamber of the pressure resistant vessel (44). Under the circumstance, analysis of the sample taken from the sampling ports (25) will provide information that can be used to predict the remediation results after the system installed in the aquifer. In other words, the auxiliary apparatuses can be used to estimate how well the oxidizing zone created by a given gas or gas Illi~S~UlC purify the groundwater. Obviously, the same device also provides a useful tool to find suitable gas or gas n~i~lule that may oxidize the cont~min~ntc when the given gas or gas n~i~ule does not performance well.
The gas injecting flow rate can be also determined by the auxiliary apparatuses. By adjusting the flow control valve (38), the gas will be injected at an slowly increased rate until the gas bubbles is formed on top of the aquifer m~t-~ri~l (37) but not buoy up into the water.
Under the given condition, the gas injecting rate is equal to groundwater dissolving the gas in 2~29~27 ~ . ~ ......
the oxidizing zone and less than the solubility of the groundwater passing through the cross section of the receptacle. The actual gas releasing rate in the aquifer can be easily calculated from the ratio between the cross section area of the device and the cross section area of the plume. If the cont~min~nt plume covers significant thickness of the aquifer and the hydraulic head changes at different depth may influence the gas dissolving rate and solubility of the gas in the groundwater, it is preferable that different pressure is used in the test.
A Brief Description Of the Drawin~s The accompanying drawings, which are incorporated in and form a part of the specification, illustrate the invention and, together with the description, serve to explain the principles of the invention. In the drawings:
Figure 1 includes a top view and cross-sectional side view of an embodiment of the remediation system of the invention.
Figure 2 and Figure 3 are detaile~d cross-sectional side views of the gas injector.
Figure 4 is a schematic of gas source manifold.
Figure S illustrates detailed cross-sectional side views of the auxiliary apparatuses, schematic of gas source manifold, sampling ports and the flow rate control units.
Figure 6 is a schematic of cross section of the pressure resistant vessel.
Claims (2)
1. A system producing an oxidizing zone within a saturated zone of an aquifer for in-situ decontamination of groundwater carrying contaminants in a plume wholly located below a water table in said saturated zone of said aquifer. said system comprising a gas means capable of producing an oxidizing environment in said groundwater which can oxidize said contaminant to purify said groundwater and said aquifer a set of gas injectors means for injecting said gas below said plume at a desired injection rate, said gas injectors means connecting to at least one pressurized gas source and embedded in at least one generally horizontal well, said gas injector means having at least one opening capable of releasing said gas at said desired injection rate to said groundwater carrying said contaminants in said aquifer a set of auxiliary apparatuses means for testing decomposition of said contaminants in said oxidizing environment and said desirable injection rate of said gas
2. The system of claim 1 wherein said oxidizing zone is generally, but not by way of limitation, positioned vertically crossing said plume and under said water table3. The system of claim 1 wherein said contaminants relate generally, but not by way of limitation, to organic compounds which are decomposable in said oxidizing environment 4. The system of claim 1 wherein said gas means is selected from comprising air,oxygen, carbon dioxide, ozone or different proportion mixture of at least two of said four gases 5. The system of claim 1 wherein said set of gas injectors means further comprise at least one gas conduit pipe means and at least one gas injector means positioned below said plume embedded in said horizontal well 6. The system of claim 5 wherein said at least one gas conduit pipe means for transporting said gas from source to said gas injector means 7. The system of claim 5 wherein said gas injectors means further comprise a gasconduit pipe having at least one opening within a gas chamber, said gas chamber covered wholly or partially by a gas permeable porous substantial through which said gas can pass into said groundwater and said aquifer 8. The system of claim 7 wherein said gas permeable porous substantial is selected from porous ceramic, perforated copper, aluminium, iron, steel or stainless steel, or perforated plastic.
9. The system of claim 5 wherein said injector means further comprise at least one set of gas conduit pipe having at least one opening to said aquifer and said contaminant plume 10. The system of claim 1 wherein said gas injectors means connected to each another by at least one flexible connecter 11. The system of claim 1 wherein said set of gas injectors means being fixed on a slide carriage which can be easily bent but hard twisted 12. The system of claim 1 wherein said horizontal well comprises a vertical shaft and at least one horizontal shaft.
13. The system of claim 12 wherein said at least one horizontal shaft constructed with a gas permeable casing.
14. The system of claim 12 wherein said at least one horizontal shaft constructed without a casing 15. The system of claim 12 wherein said at least one horizontal shaft of said horizontal well is positioned below said plume in said saturated zone of said aquifer.
16. The system of claim 1 wherein said desirable injection rate of said gas means said gas injected under said plume being capable of remaining within said plume without creating significant secondary contamination 17. The system of claim 1 wherein said desirable injection rate of said gas means said gas injected under said plume being capable of providing adequate said gas enabling said contaminant decomposition in said aquifer 18. The system of claim 1 wherein said desirable injection rate of said gas means said gas injected under said plume being capable of creating adequate said oxidization zone to cover whole cross-section of said plume in said aquifer.
19. The system of claim 1 wherein said set of auxiliary apparatuses means further comprises a gas source providing said gas, an aquifer simulating apparatus means, a pressure resistant water vessel, and at least one sampling port.
20. The system of claim 19 wherein said gas is identical with said gas of claim 1 21. The system of claim 19 wherein said aquifer simulating apparatus means further comprises a body of materials of said aquifer within a pressure resistant container, a transparent shell at least partially covering top of said pressure resistant container, a gas injector and a water flow rate controlling and monitoring apparatus means 22. The system of claim 21 wherein said body of materials of said aquifer is materials taken from said aquifer within said plume or periphery of said plume 23. The system of claim 21 wherein said pressure resistant container having inside surface covered by at least one layer of a substance having no affinity for said contaminants 24. The system of claim 23 wherein said inside surface means at least part of said surface being in contact with said contaminants carried by said groundwater 25. The system of claim 23 wherein said substance having no affinity for said contaminants is selected from group of glass, stainless steel and plastic 26. The system of claim 21 wherein said transparent shell having said inside surface covered by at least one layer of said substance having no affinity for said contaminants 27. The system of claim 21 wherein said pressure resistant container having a space between said transparent shell and a surface of said materials of said aquifer within said pressure resistant container 28. The system of claim 27 wherein said space between said transparent shell and said surface of said materials of said aquifer within said pressure resistant container is filled by said groundwater carrying said contaminants 29. The system of claim 21 wherein said gas injector within said aquifer simulating apparatus means having identical structure with said gas injector of claim 7 30. The system of claim 21 wherein said transparent shell is positioned directly above said gas injector on top of said pressure resistant container 31. The system of claim 21 wherein said pressure resistant water vessel having said contaminant groundwater compressed into said aquifer simulating apparatus means 32. The system of claim 21 wherein said pressure resistant water vessel having said inside surface covered by at least one layer of said substance having no affinity for said contaminants 33. A process for producing an oxidizing zone within a saturated zone of an aquifer for in-situ decontamination of said groundwater carrying said contaminants in said plume in said saturated zone of said aquifer, said process comprising the steps of taking a body of said materials of said aquifer from the location of said plume or from periphery area of said plume packing said body of said materials of said aquifer into said aquifer simulatingapparatus so as to represent said aquifer in field condition exacting a body of said groundwater carrying said contaminants from said plume pressing said groundwater at a rate which yield a velocity of movement of said groundwater in said aquifer simulating apparatus equivalent to Darcy velocity of said groundwater in said aquifer determining said desired gas injecting rate by injecting said gas at such a rate that visible bubble of said gas formed on said surface of said materials of said aquifer within said pressure resistant container but no visible bubble of said gas formed in said groundwater in said space between said transparent shell and said surface of said substantial of said aquifer within said pressure resistant container injecting said gas at said desired gas injecting rate into said gas injector within said aquifer simulating apparatus so that said oxidizing environment is produced analyzing water samples taken from said sampling ports on said aquifer simulating apparatus means to examine decontaminated result of said oxidizing environment yielded by said gas constructing horizontal well below said plume in said aquifer which is perpendicular with extending direction of said plume installing a set of horizontal gas injector means in said horizontal well injecting said gas at said desired gas injecting rate into said set of horizontal gas injection means to produce said oxidizing zone cross said plume monitoring decontamination process in said groundwater
9. The system of claim 5 wherein said injector means further comprise at least one set of gas conduit pipe having at least one opening to said aquifer and said contaminant plume 10. The system of claim 1 wherein said gas injectors means connected to each another by at least one flexible connecter 11. The system of claim 1 wherein said set of gas injectors means being fixed on a slide carriage which can be easily bent but hard twisted 12. The system of claim 1 wherein said horizontal well comprises a vertical shaft and at least one horizontal shaft.
13. The system of claim 12 wherein said at least one horizontal shaft constructed with a gas permeable casing.
14. The system of claim 12 wherein said at least one horizontal shaft constructed without a casing 15. The system of claim 12 wherein said at least one horizontal shaft of said horizontal well is positioned below said plume in said saturated zone of said aquifer.
16. The system of claim 1 wherein said desirable injection rate of said gas means said gas injected under said plume being capable of remaining within said plume without creating significant secondary contamination 17. The system of claim 1 wherein said desirable injection rate of said gas means said gas injected under said plume being capable of providing adequate said gas enabling said contaminant decomposition in said aquifer 18. The system of claim 1 wherein said desirable injection rate of said gas means said gas injected under said plume being capable of creating adequate said oxidization zone to cover whole cross-section of said plume in said aquifer.
19. The system of claim 1 wherein said set of auxiliary apparatuses means further comprises a gas source providing said gas, an aquifer simulating apparatus means, a pressure resistant water vessel, and at least one sampling port.
20. The system of claim 19 wherein said gas is identical with said gas of claim 1 21. The system of claim 19 wherein said aquifer simulating apparatus means further comprises a body of materials of said aquifer within a pressure resistant container, a transparent shell at least partially covering top of said pressure resistant container, a gas injector and a water flow rate controlling and monitoring apparatus means 22. The system of claim 21 wherein said body of materials of said aquifer is materials taken from said aquifer within said plume or periphery of said plume 23. The system of claim 21 wherein said pressure resistant container having inside surface covered by at least one layer of a substance having no affinity for said contaminants 24. The system of claim 23 wherein said inside surface means at least part of said surface being in contact with said contaminants carried by said groundwater 25. The system of claim 23 wherein said substance having no affinity for said contaminants is selected from group of glass, stainless steel and plastic 26. The system of claim 21 wherein said transparent shell having said inside surface covered by at least one layer of said substance having no affinity for said contaminants 27. The system of claim 21 wherein said pressure resistant container having a space between said transparent shell and a surface of said materials of said aquifer within said pressure resistant container 28. The system of claim 27 wherein said space between said transparent shell and said surface of said materials of said aquifer within said pressure resistant container is filled by said groundwater carrying said contaminants 29. The system of claim 21 wherein said gas injector within said aquifer simulating apparatus means having identical structure with said gas injector of claim 7 30. The system of claim 21 wherein said transparent shell is positioned directly above said gas injector on top of said pressure resistant container 31. The system of claim 21 wherein said pressure resistant water vessel having said contaminant groundwater compressed into said aquifer simulating apparatus means 32. The system of claim 21 wherein said pressure resistant water vessel having said inside surface covered by at least one layer of said substance having no affinity for said contaminants 33. A process for producing an oxidizing zone within a saturated zone of an aquifer for in-situ decontamination of said groundwater carrying said contaminants in said plume in said saturated zone of said aquifer, said process comprising the steps of taking a body of said materials of said aquifer from the location of said plume or from periphery area of said plume packing said body of said materials of said aquifer into said aquifer simulatingapparatus so as to represent said aquifer in field condition exacting a body of said groundwater carrying said contaminants from said plume pressing said groundwater at a rate which yield a velocity of movement of said groundwater in said aquifer simulating apparatus equivalent to Darcy velocity of said groundwater in said aquifer determining said desired gas injecting rate by injecting said gas at such a rate that visible bubble of said gas formed on said surface of said materials of said aquifer within said pressure resistant container but no visible bubble of said gas formed in said groundwater in said space between said transparent shell and said surface of said substantial of said aquifer within said pressure resistant container injecting said gas at said desired gas injecting rate into said gas injector within said aquifer simulating apparatus so that said oxidizing environment is produced analyzing water samples taken from said sampling ports on said aquifer simulating apparatus means to examine decontaminated result of said oxidizing environment yielded by said gas constructing horizontal well below said plume in said aquifer which is perpendicular with extending direction of said plume installing a set of horizontal gas injector means in said horizontal well injecting said gas at said desired gas injecting rate into said set of horizontal gas injection means to produce said oxidizing zone cross said plume monitoring decontamination process in said groundwater
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002129727A CA2129727A1 (en) | 1994-08-08 | 1994-08-08 | In-situ oxidizing zone remediation system for contaminated groundwater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002129727A CA2129727A1 (en) | 1994-08-08 | 1994-08-08 | In-situ oxidizing zone remediation system for contaminated groundwater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2129727A1 true CA2129727A1 (en) | 1996-02-09 |
Family
ID=4154136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002129727A Abandoned CA2129727A1 (en) | 1994-08-08 | 1994-08-08 | In-situ oxidizing zone remediation system for contaminated groundwater |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2129727A1 (en) |
-
1994
- 1994-08-08 CA CA002129727A patent/CA2129727A1/en not_active Abandoned
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5698092A (en) | In-situ oxidizing zone remediation system for contaminated groundwater | |
| US5302286A (en) | Method and apparatus for in situ groundwater remediation | |
| Godsy | Methanogenic biodegradation of creosote-derived contaminants in natural and simulated ground water ecosystems | |
| US5277518A (en) | Contaminant remediation, biodegradation and removel methods and apparatus | |
| CN110947752A (en) | In-situ chemical oxidation remediation device for simulating polluted underground water and using method | |
| Voudrias et al. | Dissolution of a toluene pool under constant and variable hydraulic gradients with implications for aquifer remediation | |
| US5398757A (en) | Mono-well for soil sparging and soil vapor extraction | |
| CA2193850C (en) | In situ soil and/or residue remediation system and process using multi-level midspacing measurement | |
| CA2152057A1 (en) | Removing vocs from groundwater | |
| CA2108128A1 (en) | Removing volatile organic compounds from groundwater | |
| US5017289A (en) | Process for in situ biodegradation of hydrocarbon contaminated soil | |
| US6502633B2 (en) | In situ water and soil remediation method and system | |
| Blanford et al. | Cyclodextrin‐enhanced vertical flushing of a trichloroethene contaminated aquifer | |
| KR20030087915A (en) | Method for purifying a layer of contaminated soil and apparatus | |
| Wilson et al. | In situ pore-liquid sampling in the vadose zone | |
| CN114062637A (en) | Multifunctional simulation device for groundwater pollution diffusion and in-situ remediation and application | |
| US5623992A (en) | Method and system for decontaminating soils and groundwater of gasoline | |
| US5593248A (en) | Nontoxic chemical process for in situ permeability enhancement and accelerated decontamination of fine-grain subsurface sediments | |
| Widrig et al. | Biodegradation of No. 2 diesel fuel in the vadose zone: a soil column study | |
| CN211707712U (en) | In-situ chemical oxidation repair device for simulating polluted underground water | |
| CN216595086U (en) | Multifunctional underground water pollution diffusion and in-situ remediation simulation device | |
| CA2129727A1 (en) | In-situ oxidizing zone remediation system for contaminated groundwater | |
| JP2006130419A (en) | Contaminated stratum cleaning system and contaminated stratum cleaning method using it | |
| KR100420256B1 (en) | Restitutive apparatus for polluted soil and subterranean water | |
| EP0383789B1 (en) | A process for in situ biodegradation of hydrocarbon contaminated soil |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |