CN111112313A - In-situ water treatment system - Google Patents
In-situ water treatment system Download PDFInfo
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- CN111112313A CN111112313A CN201911412771.0A CN201911412771A CN111112313A CN 111112313 A CN111112313 A CN 111112313A CN 201911412771 A CN201911412771 A CN 201911412771A CN 111112313 A CN111112313 A CN 111112313A
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Soil Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses an in-situ water treatment system which comprises a plurality of gas injection wells, a plurality of gas extraction wells, a gas extraction device and an aeration device, wherein the plurality of gas extraction wells are arranged on the periphery of the gas injection wells, each gas extraction well is internally provided with an MBR (membrane bioreactor) membrane module, the aeration device is matched with the gas injection wells and the MBR membrane modules and is configured to aerate the gas injection wells and the MBR membrane modules, and the gas extraction device is matched with the gas extraction wells and is configured to extract gas treated by the MBR membrane modules in the gas extraction wells. The gas injection well and the MBR membrane module of the in-situ water treatment system share one aeration system, so that the repair range is wide, and various pollutants can be repaired; and the MBR membrane module is combined with the vapor extraction well, so that sewage treatment can be carried out in the underground water well, and compared with a P & T system, ground sewage treatment facilities and underground water extraction facilities are saved, and the integral structure is greatly simplified.
Description
Technical Field
The invention relates to the field of water treatment equipment, in particular to an in-situ water treatment system.
Background
Extraction treatment is a traditional technique for groundwater and soil remediation. Contaminated groundwater is pumped to the surface, treated and re-injected into the ground, or discharged into surface water or sewage treatment plants. In situ bioremediation may be stimulated by reinjection because the treated groundwater may be enriched with oxygen and nutrients before it is reinjected back.
The pumping and treating technology (P & T for short) is to capture the polluted water body in the ground and pump it out of the ground, and then to purify the water and use it or input it into the ground again by adopting various treating technologies. The pumping-treatment method is mainly adopted for early groundwater remediation, however, the P & T treatment system is adopted, the sewage treatment of the P & T treatment system is mainly carried out on the ground, a large amount of equipment is needed, and the occupied space is large;
in addition, some existing extraction wells are used as a treatment unit, and although the floor space is small, the types of pollutants to be treated are limited, the treatment range is limited, and more materials and equipment are required to be configured.
Disclosure of Invention
The invention aims to provide a combined type in-situ water treatment system which shares one aeration system, has a large repair range and can repair a plurality of pollutants, and mainly solves the problems that the ex-situ groundwater treatment equipment occupies too large area, one extraction well is used as an in-situ repair system for in-situ repair, the repair area is limited, and the repair substances are single.
According to one aspect of the invention, the in-situ water treatment system comprises a plurality of gas injection wells, a plurality of gas extraction wells, a gas extraction device and an aeration device, wherein the plurality of gas extraction wells are arranged on the periphery of the gas injection wells, each gas extraction well is internally provided with an MBR (membrane bioreactor) membrane component, the aeration device is matched with the gas injection wells and the MBR membrane components and is configured to aerate the gas injection wells and the MBR membrane components, and the gas extraction device is matched with the gas extraction wells and is configured to extract gas treated by the MBR membrane components in the gas extraction wells.
Therefore, the MBR membrane module removes biodegradable organic pollutants in water through activated sludge, and then adopts the MBR membrane to carry out solid-liquid separation on the purified water and the activated sludge so as to achieve the effect of purifying the water body; the basic principle of the soil vapor extraction is that a vacuum pump is used for extraction to generate negative pressure, when air flows through a polluted area, volatile and semi-volatile organic pollutants in soil pores are desorbed and carried away by airflow, and the volatile and semi-volatile organic pollutants are collected by an extraction well and finally treated to achieve the purpose of purifying the air-entrained soil.
The gas injection well and the MBR membrane module of the in-situ water treatment system share one aeration system, the repair range is wide, and various pollutants can be repaired, so that the problems that the occupied area of ex-situ groundwater water treatment equipment is too large, one extraction well is used as an in-situ repair system for in-situ repair, the repair area is limited, and the repair substances are single are mainly solved.
The invention combines the MBR membrane component and the gas phase extraction well, so that sewage treatment can be carried out in the underground water well, and compounds in the surrounding polluted soil and water can be fully driven out under the combined action of the MBR membrane component and the gas phase extraction well, so that compared with a P & T system, ground sewage treatment facilities and underground water extraction facilities are saved, the integral structure is greatly simplified, and due to the high efficiency of the MBR membrane component, no sludge is generated in the whole treatment process, and the cost of sludge disposal is greatly reduced.
The combined in-situ water treatment system has the treatment effect on volatile compounds of more than 95 percent; the removal rate of each pollutant can reach more than 90 percent; the sludge is basically not generated in the treatment process, so that the sludge treatment cost is greatly reduced; the aeration of the MBR membrane module is mainly used in the operation process, and the aeration quantity required in the operation process of the MBR membrane module is greatly reduced due to the gas injection of a large amount of water-soluble gas in the gas injection process in the combined type in-situ water treatment system, so that the energy consumption problem in the operation process of the MBR membrane module is reduced, the operation cost is reduced, and the adsorption device in a gas injection well can be greatly reduced.
In some embodiments, the aeration device comprises an aeration main pipe, a first aeration pipe branch pipe and a second aeration pipe branch pipe, wherein one end of the first aeration pipe branch pipe is connected with the gas injection well, the other end of the first aeration pipe branch pipe is communicated with the aeration main pipe, one end of the second aeration pipe branch pipe is connected with the MBR membrane module, and the other end of the second aeration pipe branch pipe is communicated with the aeration main pipe. Thereby, volatile compounds dissolved in groundwater, compounds adsorbed on the surface of soil particles, and compounds clogged in the soil voids are driven out by pressurized aeration in the gas injection well through the first aeration pipe branch. The biological oxygen demand of MBR membrane module can be satisfied through second aeration pipe branch pipe, makes the continuous shake of membrane silk of MBR membrane module again, prevents that activated sludge from attaching to the surface of MBR membrane and causing the pollution, and then guarantees that the MBR membrane module can long-term continuous stable operation, prolongs the life of MBR membrane module greatly.
In some embodiments, the vapor extraction device comprises a vapor extraction main pipe, a vacuum pump and a vapor extraction pipe branch pipe, wherein the vacuum pump is connected with the vapor extraction main pipe, one end of the vapor extraction pipe branch pipe is communicated with the vapor extraction main pipe, and the other end of the vapor extraction pipe branch pipe is connected with the vapor extraction well. Therefore, the basic principle of the soil vapor extraction is that a vacuum pump is used for extraction to generate negative pressure, when air flows through a polluted area, volatile and semi-volatile organic pollutants in soil pores are desorbed and carried away by air flow, and the volatile and semi-volatile organic pollutants are collected by an extraction well and finally treated to achieve the purpose of purifying the aeration zone soil.
In some embodiments, a plurality of MBR membrane modules are disposed within each vapor extraction well. Therefore, the sewage treatment efficiency can be greatly improved.
In some embodiments, each of the MBR membrane modules includes an MBR membrane and an MBR membrane circulation pump, both of which are disposed in a housing of the vapor extraction well, the MBR membrane circulation pump cooperating with the MBR membrane. Therefore, a certain amount of aeration is carried out below the MBR membrane, so that the biological oxygen demand is met, membrane filaments are continuously shaken, the pollution caused by the attachment of activated sludge on the surface of the membrane is prevented, and the long-term continuous and stable operation of the MBR membrane is further ensured.
In some embodiments, a heating tube is disposed within the gas injection well.
In some embodiments, a dosing tube is disposed within the gas injection well. Therefore, a heating and dosing system is additionally arranged at the gas injection well, so that pollutants can react underground, a beneficial auxiliary effect is brought to the treatment of the MBR membrane module, and then the pollutants are extracted through gas phase extraction.
In some embodiments, a float sorption device is disposed within the gas injection well. Therefore, the impurity floating adsorption device can be active carbon nano-fiber, and the function of the impurity floating adsorption device is to remove most organic pollutants and certain inorganic matters.
The invention has the beneficial effects that:
the invention combines the MBR membrane component and the gas phase extraction well, so that sewage treatment can be carried out in the underground water well, and compounds in the surrounding polluted soil and water can be fully driven out under the combined action of the MBR membrane component and the gas phase extraction well, so that compared with a P & T system, ground sewage treatment facilities and underground water extraction facilities are saved, the integral structure is greatly simplified, and due to the high efficiency of the MBR membrane component, no sludge is generated in the whole treatment process, and the cost of sludge disposal is greatly reduced.
The combined in-situ water treatment system has the treatment effect on volatile compounds of more than 95 percent; the removal rate of each pollutant can reach more than 90 percent; the sludge is basically not generated in the treatment process, so that the sludge treatment cost is greatly reduced; the aeration of the MBR membrane module is mainly used in the operation process, and the aeration quantity required in the operation process of the MBR membrane module is greatly reduced due to the gas injection of a large amount of water-soluble gas in the gas injection process in the combined type in-situ water treatment system, so that the energy consumption problem in the operation process of the MBR membrane module is reduced, the operation cost is reduced, and the adsorption device in a gas injection well can be greatly reduced.
The in-situ water treatment system of the invention shares one aeration system, has a large repair range and can repair a plurality of pollutants, and mainly solves the problems that the ex-situ groundwater treatment equipment occupies too large area, and the in-situ repair is mostly carried out by taking one extraction well as one in-situ repair system, so that the repair area is limited and the repair materials are single.
Drawings
FIG. 1 is a schematic diagram of an in situ water treatment system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a gas injection well of the in situ water treatment system shown in FIG. 1;
FIG. 3 is a schematic diagram of a vapor extraction well of the in situ water treatment system of FIG. 1.
Reference numerals in FIGS. 1 to 3: 1-a gas injection well; 2-a gas phase extraction well; 3-a vapor phase extraction device; 4-an aeration device; 5-MBR membrane module; 6-heating a tube; 7-a medicine feeding pipe; 8-a float adsorption unit; 31-gas phase extraction main pipe; 32-gas phase extraction tube branch; 41-aeration main pipe; 42-a first aeration pipe branch pipe; 43-a second aerator pipe branch; 51-MBR membrane; 52-MBR membrane circulation pump.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
FIGS. 1-3 schematically illustrate an in situ water treatment system according to one embodiment of the present invention.
As shown in fig. 1 to 3, the in-situ water treatment system includes a gas injection well 1, a vapor extraction well 2, a vapor extraction device 3 and an aeration device 4. The gas extraction well 2 is a plurality of, and a plurality of gas extraction wells 2 are arranged on the periphery of the gas injection well 1. An MBR membrane module 5 is arranged in each gas phase extraction well 2. The aeration device 4 is matched with the gas injection well 1 and the MBR membrane module 5 and is configured to aerate the gas injection well 1 and the MBR membrane module 5. The gas phase extraction equipment is matched with the gas phase extraction well 2 and is configured to extract the gas treated by the MBR membrane module 5 in the gas phase extraction well 2.
The MBR membrane module 5 is used for removing biodegradable organic pollutants in water through activated sludge, and then the MBR membrane 51 is used for carrying out solid-liquid separation on the purified water and the activated sludge so as to achieve the effect of purifying the water body; the operating principle of the MBR membrane module 5 is as follows: the wastewater and the activated sludge are separated by the membrane, the wastewater flows in the membrane, the activated sludge containing certain obligate bacteria flows outside the membrane, the wastewater is not directly contacted with microorganisms, and organic pollutants can be selectively degraded by the microorganisms on the other side of the membrane through the membrane.
The basic principle of the soil vapor extraction is that a vacuum pump is used for extraction to generate negative pressure, when air flows through a polluted area, volatile and semi-volatile organic pollutants in soil pores are desorbed and carried away by airflow, and the volatile and semi-volatile organic pollutants are collected by an extraction well and finally treated to achieve the purpose of purifying the air-entrained soil.
The aeration apparatus 4 of the present embodiment includes an aeration header 41, a first aeration tube branch 42, and a second aeration tube branch 43. One end of the first aeration pipe branch pipe 42 is connected with the gas injection well 1, and the other end is communicated with the aeration main pipe 41. One end of the second aeration pipe branch pipe 43 is connected with the MBR membrane module 5 in the vapor extraction well 2, and the other end is communicated with the aeration main pipe 41. The number of the first aeration pipe branch pipes 42 is the same as that of the gas injection wells 1, and the number of the second aeration pipe branch pipes 43 is the same as that of the vapor extraction wells 2. Thereby, volatile compounds dissolved in groundwater, compounds adsorbed on the surface of soil particles, and compounds clogged in the soil voids are driven out by pressurized aeration in the gas injection well 1 through the first aeration pipe branch 42. The biological oxygen demand of the MBR membrane module 5 can be met through the second aeration pipe branch pipe 43, membrane filaments of the MBR membrane module 5 are continuously shaken, activated sludge is prevented from being attached to the surface of the MBR membrane 51 to cause pollution, the MBR membrane module 5 can be continuously and stably operated for a long time, and the service life of the MBR membrane module 5 is greatly prolonged.
The aeration pipeline (i.e. the second aeration pipe branch pipe 43) connected with the MBR membrane module 5 in the embodiment can perform corresponding control on the aeration air quantity of each aeration pipeline according to the concentration of pollutants in different gas phase extraction wells 2 through the control mode of the electromagnetic valve and the PLC control system, so that the effect of accurate aeration is achieved.
The vapor extraction apparatus 3 of the present embodiment includes a vapor extraction main pipe 31, a vacuum pump, and a vapor extraction pipe branch pipe 32. The vacuum pump is connected to the vapor extraction manifold 31. One end of the gas phase extraction pipe branch pipe 32 is communicated with the gas phase extraction main pipe 31, and the other end is connected with the gas phase extraction well 2. The number of vapor extraction pipe branch pipes 32 of the present embodiment is the same as the number of vapor extraction wells 2. Therefore, the basic principle of the soil vapor extraction is that a vacuum pump is used for extraction to generate negative pressure, when air flows through a polluted area, volatile and semi-volatile organic pollutants in soil pores are desorbed and carried away by air flow, and the volatile and semi-volatile organic pollutants are collected by an extraction well and finally treated to achieve the purpose of purifying the aeration zone soil.
As shown in fig. 1, a plurality of MBR membrane modules 5 are disposed in each vapor extraction well 2. Therefore, the sewage treatment efficiency can be greatly improved. As shown in fig. 3, each MBR membrane module 5 includes an MBR membrane 51 and an MBR membrane circulation pump 52. The MBR membrane circulating pump 52 and the MBR membrane 51 are both arranged on the shell of the gas phase extraction well 2, and the MBR membrane circulating pump 52 is arranged above the MBR membrane 51 and matched with the MBR membrane 51. One end of the second aeration pipe branch pipe 43 is communicated with the aeration header pipe 41, and the other end thereof extends below the MBR membrane 51. Therefore, a certain amount of aeration can be carried out below the MBR membrane 51, so that the biological oxygen demand is met, the membrane filaments are continuously shaken, the pollution caused by the attachment of activated sludge on the surface of the membrane is prevented, and the long-term continuous and stable operation of the MBR membrane 51 is further ensured.
The gas injection well 1 of the embodiment is internally provided with a heating pipe 6 and a dosing pipe 7, and the heating effect can be realized through the heating pipe 6, so that the reaction is accelerated. Some of the drug that reacts with the contaminant may be added through the dosing tube 7. Therefore, a heating and dosing system is additionally arranged at the gas injection well 1, so that pollutants can react underground, a beneficial auxiliary effect is brought to the treatment of the MBR membrane module 5, and then the pollutants are extracted through gas phase extraction.
As shown in fig. 2, the gas injection well 1 of the present embodiment is provided with a floating adsorption device 8, and the floating adsorption device 8 is provided at an upper-middle position of the gas injection well 1. Thus, the present invention of the aerosol adsorbent device 8 may be activated carbon nanofibers, the aerosol adsorbent device 8 serving to remove most organic contaminants and certain inorganic substances.
The combined in-situ water treatment system has the following specific operation processes:
taking a gas injection well 1 as a center, arranging 3-6 gas phase extraction wells 2 around the gas injection well 1, and arranging an MBR (membrane bioreactor) membrane component 5 in each gas phase extraction well 2, wherein the combined action of the gas phase extraction wells 2 and the MBR membrane component 5 can fully drive out compounds in the surrounding polluted soil and water; aeration at the MBR component can also drive the treatment of volatile compounds around the gas phase extraction well 2; meanwhile, a heating and dosing system is added at the gas injection well 1, so that pollutants can react underground, a beneficial auxiliary effect is brought to the treatment of the MBR membrane 51, and the MBR membrane is extracted and pumped out through gas phase extraction; the waste gas generated in the water treatment process does not need to be treated independently, and is extracted by the vapor extraction system, so that the waste gas can be directly treated in the vapor treatment system, and the cost of tail gas treatment is reduced.
The invention combines the MBR membrane component 5 and the gas phase extraction well 2, so that sewage treatment can be carried out in an underground water well, and compounds in the surrounding polluted soil and water can be fully driven out under the combined action of the MBR membrane component 5 and the gas phase extraction well 2, so that compared with a P & T system, ground sewage treatment facilities and underground water extraction facilities are saved, the integral structure is greatly simplified, and the sludge is not generated basically in the whole treatment process due to the high efficiency of the MBR membrane component 5, so that the cost of sludge disposal is greatly reduced.
The combined in-situ water treatment system has the treatment effect on volatile compounds of more than 95 percent; the removal rate of each pollutant can reach more than 90 percent; the sludge is basically not generated in the treatment process, so that the sludge treatment cost is greatly reduced; the aeration of the MBR membrane module 5 in the operation process is mainly used, and the aeration quantity required in the operation process of the MBR membrane module 5 is greatly reduced due to the gas injection of a large amount of water-soluble gas in the gas injection process in the combined type in-situ water treatment system, so that the energy consumption problem in the operation process of the MBR membrane module 5 is reduced, the operation cost is reduced, and the adsorption device in the gas injection well 1 can be greatly reduced.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (8)
1. The in-situ water treatment system is characterized by comprising a gas injection well (1), a gas extraction well (2), a gas extraction device (3) and an aeration device (4), wherein the gas extraction well (2) is multiple and a plurality of the gas extraction well (2) is arranged at the periphery of the gas injection well (1), each gas extraction well (2) is internally provided with an MBR (membrane bioreactor) assembly (5), the aeration device (4) is matched with the gas injection well (1) and the MBR (membrane bioreactor) assembly (5) and is configured to aerate the gas injection well (1) and the MBR (membrane bioreactor) assembly (5), and the gas extraction device is matched with the gas extraction well (2) and is configured to extract gas treated by the MBR (membrane assembly (5) in the gas extraction well (2).
2. The in-situ water treatment system according to claim 1, wherein the aeration device (4) comprises an aeration main (41), a first aeration pipe branch (42) and a second aeration pipe branch (43), wherein one end of the first aeration pipe branch (42) is connected with the gas injection well (1), the other end of the first aeration pipe branch is communicated with the aeration main (41), one end of the second aeration pipe branch (43) is connected with the MBR membrane module (5) in the gas phase extraction well (2), and the other end of the second aeration pipe branch is communicated with the aeration main (41).
3. The in-situ water treatment system according to claim 1, wherein the vapor extraction device (3) comprises a vapor extraction main pipe (31), a vacuum pump and a vapor extraction pipe branch pipe (32), the vacuum pump is connected with the vapor extraction main pipe (31), one end of the vapor extraction pipe branch pipe (32) is communicated with the vapor extraction main pipe (31), and the other end is connected with the vapor extraction well (2).
4. An in situ water treatment system according to claim 1, wherein a plurality of MBR membrane modules (5) are arranged in each gas phase extraction well (2).
5. The in-situ water treatment system according to claim 4, wherein each MBR membrane module (5) comprises an MBR membrane (51) and an MBR membrane circulating pump (52), the MBR membrane circulating pump (52) and the MBR membrane (51) are both arranged on the shell of the vapor extraction well (2), and the MBR membrane circulating pump (52) is matched with the MBR membrane (51).
6. An in-situ water treatment system according to any of claims 1 to 5, wherein a heating pipe (6) is arranged in the gas injection well (1).
7. An in-situ water treatment system according to any of claims 1 to 5, wherein a dosing pipe (7) is arranged in the gas injection well (1).
8. An in-situ water treatment system according to any of claims 1 to 5, wherein a floating adsorption device (8) is arranged in the gas injection well (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911412771.0A CN111112313A (en) | 2019-12-31 | 2019-12-31 | In-situ water treatment system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911412771.0A CN111112313A (en) | 2019-12-31 | 2019-12-31 | In-situ water treatment system |
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| CN111112313A true CN111112313A (en) | 2020-05-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112808757A (en) * | 2020-12-29 | 2021-05-18 | 中科华鲁土壤修复工程有限公司 | Group type extraction and injection integrated repair system for small-area supply-free underground water well |
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2019
- 2019-12-31 CN CN201911412771.0A patent/CN111112313A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112808757A (en) * | 2020-12-29 | 2021-05-18 | 中科华鲁土壤修复工程有限公司 | Group type extraction and injection integrated repair system for small-area supply-free underground water well |
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