CN117602742B - Groundwater pollution restoration system and restoration method - Google Patents
Groundwater pollution restoration system and restoration method Download PDFInfo
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- CN117602742B CN117602742B CN202311730820.1A CN202311730820A CN117602742B CN 117602742 B CN117602742 B CN 117602742B CN 202311730820 A CN202311730820 A CN 202311730820A CN 117602742 B CN117602742 B CN 117602742B
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- 238000003895 groundwater pollution Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims description 26
- 238000011065 in-situ storage Methods 0.000 claims abstract description 90
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 88
- 238000012544 monitoring process Methods 0.000 claims abstract description 78
- 238000005067 remediation Methods 0.000 claims abstract description 53
- 238000002347 injection Methods 0.000 claims abstract description 50
- 239000007924 injection Substances 0.000 claims abstract description 50
- 238000006243 chemical reaction Methods 0.000 claims abstract description 48
- 230000008439 repair process Effects 0.000 claims abstract description 41
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims abstract description 29
- 230000000903 blocking effect Effects 0.000 claims abstract description 26
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 238000005273 aeration Methods 0.000 claims description 36
- 239000003795 chemical substances by application Substances 0.000 claims description 33
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 31
- 239000003673 groundwater Substances 0.000 claims description 28
- 238000003860 storage Methods 0.000 claims description 23
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 20
- 229910021536 Zeolite Inorganic materials 0.000 claims description 20
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 20
- 239000010457 zeolite Substances 0.000 claims description 20
- 239000000243 solution Substances 0.000 claims description 17
- 241000894006 Bacteria Species 0.000 claims description 16
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- 230000004888 barrier function Effects 0.000 claims description 15
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- 239000002101 nanobubble Substances 0.000 claims description 13
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- 239000001301 oxygen Substances 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- 238000006213 oxygenation reaction Methods 0.000 claims description 10
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 10
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 10
- 238000011049 filling Methods 0.000 claims description 9
- 235000015097 nutrients Nutrition 0.000 claims description 9
- 239000003344 environmental pollutant Substances 0.000 claims description 8
- 239000007800 oxidant agent Substances 0.000 claims description 8
- 230000001590 oxidative effect Effects 0.000 claims description 8
- 231100000719 pollutant Toxicity 0.000 claims description 8
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 7
- 238000012806 monitoring device Methods 0.000 claims description 6
- 241000588986 Alcaligenes Species 0.000 claims description 5
- 241000589516 Pseudomonas Species 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 16
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 10
- 238000003911 water pollution Methods 0.000 abstract description 6
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 abstract description 4
- 244000005700 microbiome Species 0.000 description 9
- 238000001179 sorption measurement Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
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- 229910052761 rare earth metal Inorganic materials 0.000 description 5
- 150000002910 rare earth metals Chemical class 0.000 description 5
- 239000010802 sludge Substances 0.000 description 5
- 230000008685 targeting Effects 0.000 description 5
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 4
- 230000001580 bacterial effect Effects 0.000 description 4
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- 244000035744 Hura crepitans Species 0.000 description 2
- 239000007836 KH2PO4 Substances 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
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- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 description 2
- 229910000397 disodium phosphate Inorganic materials 0.000 description 2
- 239000001963 growth medium Substances 0.000 description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 2
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- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000001103 potassium chloride Substances 0.000 description 2
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 description 2
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- LKDRXBCSQODPBY-VRPWFDPXSA-N D-fructopyranose Chemical compound OCC1(O)OC[C@@H](O)[C@@H](O)[C@@H]1O LKDRXBCSQODPBY-VRPWFDPXSA-N 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 230000001651 autotrophic effect Effects 0.000 description 1
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- 231100000315 carcinogenic Toxicity 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- XKLJHFLUAHKGGU-UHFFFAOYSA-N nitrous amide Chemical compound ON=N XKLJHFLUAHKGGU-UHFFFAOYSA-N 0.000 description 1
- 244000144977 poultry Species 0.000 description 1
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- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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- 239000000725 suspension Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- AYNNSCRYTDRFCP-UHFFFAOYSA-N triazene Chemical compound NN=N AYNNSCRYTDRFCP-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
-
- 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
-
- 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
- C02F3/006—Regulation methods for biological treatment
-
- 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
- C02F3/10—Packings; Fillings; Grids
- C02F3/105—Characterized by the chemical composition
- C02F3/107—Inorganic materials, e.g. sand, silicates
-
- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/348—Biological treatment of water, waste water, or sewage characterised by the microorganisms used characterised by the way or the form in which the microorganisms are added or dosed
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/15—N03-N
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Soil Sciences (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a groundwater pollution repair system, which comprises a pollution blocking unit, an in-situ repair unit, a reaction wall unit and a water quality monitoring unit; the underground water pollution area is an area polluted by water ammonia nitrogen and nitrate nitrogen, the pollution blocking unit is arranged at the upstream of the in-situ restoration unit, the in-situ restoration unit comprises a plurality of in-situ injection well groups and a liquid injection device communicated with the in-situ injection well groups, and the in-situ injection well groups are uniformly distributed in the underground water pollution area; the reaction wall unit is arranged at the downstream of the in-situ remediation unit, and the water quality monitoring unit comprises a plurality of monitoring wells.
Description
Technical Field
The invention belongs to the technical field of groundwater remediation, and particularly relates to a groundwater pollution remediation system and a remediation method.
Background
Groundwater is taken as a component part in a water resource system, and important resources which are indispensable for guaranteeing domestic water, social and economic development and ecological environment balance of residents are ensured. With the rapid development of economy, the contradiction between supply and demand of groundwater resources and pollution problems are increasingly prominent, wherein the pollution of groundwater 'triazene' caused by fertilizer use, domestic garbage stacking, industrial sewage infiltration, livestock and poultry breeding tail water discharge, mine ammonium salt leaching exploitation and the like becomes one of the most serious pollution problems of groundwater, and the pollution tends to be aggravated. The nitrogen pollution occurrence state in the underground water is mainly ammonia nitrogen and nitrate nitrogen, and the ammonia nitrogen and nitrate nitrogen in the drinking water can be converted into nitrite nitrogen under certain conditions and combined with protein to form strong cancerogenic substance nitrosamine, thereby threatening the health of human bodies.
The microorganism repairing technology aims at the most efficient and environment-friendly groundwater in-situ repairing technology for ammonia nitrogen and nitrate nitrogen pollution, but the existing repairing technology has the following problems:
(1) The traditional biological denitrification process principle is a nitrification-denitrification sequencing batch reaction, for example, patent CN 116444069A discloses an acidic rare earth mine groundwater in-situ restoration device, a use method thereof and a restoration reaction unit comprising the device, the method needs to respectively meet the growth environments of autotrophic nitrifying bacteria and heterotrophic denitrifying bacteria, ammonia nitrogen concentration is reduced but the nitrate nitrogen concentration of a product is continuously increased when the nitrification reaction is carried out, and nitrate nitrogen concentration is reduced but rebound of the ammonia nitrogen concentration possibly occurs when the denitrification reaction is carried out. In the in-situ injection repair process, the aerobic and anaerobic conditions of the groundwater need to be repeatedly switched, the established dominant groundwater strain community structure of the repair area is changed, and the problems of complex operation, low operation efficiency, incapability of synchronously removing pollutants and the like exist.
(2) Groundwater is often in an anoxic and low-carbon environment, and in order to meet the growth and degradation conditions of microorganisms, an indirect supplementary injection repair agent is needed. Along with the change of pollutant concentration and water quality parameters, the parameters such as the injection dosage, the proportion and the like of each repairing agent are dynamically adjusted and optimized in time according to monitoring data, for example, patent CN 104370375B discloses an in-situ enhanced nitrification and denitrification integrated system and method for groundwater ammonia nitrogen, the adding amount and the adding frequency in the patent are fixed, the optimal repairing reaction condition cannot be met, and the waste of the repairing agent is also caused.
(3) Each repair technology has the technical advantages and short plates, and in the field pollution repair, the functions of pollution emergency blocking, repair and monitoring are difficult to be effectively realized by adopting a single repair mode. For in-situ injection repair, the repair efficiency is high, and the method is suitable for rapidly removing high-concentration pollution, but along with the increase of repair operation and maintenance time, the cost is increased, the repair cost performance is reduced, and the pollution often has tailing phenomenon. For permeable reactive barrier, for passive restoration without power, the operation and maintenance cost is low, but the wall construction cost is higher, the filler replacement operation is complex, and the permeable reactive barrier is suitable for long-acting and deep restoration of a low-concentration pollution area at the downstream of the pollution area.
Therefore, development of a groundwater pollution repair system and a repair method capable of integrating pollution barrier, in-situ targeting repair, terminal depth repair and on-line tracking and monitoring at the same time is needed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide the underground water pollution restoration system and the restoration method which can integrate pollution blocking, in-situ targeting restoration, tail end depth restoration and on-line tracking and monitoring, and can treat polluted underground water rapidly, efficiently and timely.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The first aspect of the invention provides a groundwater pollution remediation system, comprising a water quality monitoring unit, a pollution blocking unit arranged at the upstream of a groundwater pollution area, an in-situ remediation unit arranged in the groundwater pollution area, and a reaction wall unit arranged at the downstream of the groundwater pollution area;
the pollution blocking unit is arranged at the upstream of the in-situ restoration unit and is used for enclosing polluted underground water in a polluted area;
The in-situ remediation unit comprises a plurality of in-situ injection well groups and a liquid injection device communicated with the in-situ injection well groups, and the in-situ injection well groups are uniformly distributed in the groundwater pollution area; the lower part of a well pipe of the in-situ injection well group is provided with a sieve, the depth of the sieve covers a target repairing layer, and the liquid injection device injects a plurality of repairing agents into polluted underground water through the in-situ injection well group;
The reaction wall unit is arranged at the downstream of the in-situ repair unit, and the reaction wall unit is filled with active filler.
The water quality monitoring unit comprises a plurality of monitoring wells which are respectively arranged at the upper and lower streams of the pollution blocking unit, the in-situ remediation unit, the reaction wall unit and the inside of the in-situ remediation unit;
The groundwater pollution area is an area polluted by ammonia nitrogen and nitrate nitrogen.
Compared with the prior art, the groundwater pollution remediation system provided by the invention forms a groundwater pollution remediation method integrating pollution blocking, in-situ targeting remediation, tail end deep remediation and on-line tracking and monitoring by arranging the pollution blocking unit, the in-situ remediation unit, the reaction wall unit and the water quality monitoring unit, can rapidly, efficiently and timely treat polluted groundwater, and has better technical and economic applicability on pollution sites such as ion-type rare earth mines, household garbage landfills and the like with serious pollution of groundwater ammonia nitrogen and nitrate nitrogen.
Further, the pollution blocking unit is a cement blocking wall which is built by cement jet grouting piles, so that underground water can be effectively polluted to be enclosed in a pollution area, and clean underground water can be prevented from being polluted. Wherein the cement-based partition wall has a water-cement ratio of 0.8:1-1.5:1, the cement consumption is 50-70 kg/m, and the permeability coefficient is less than 10 -6 cm/s and far lower than that of undisturbed soil.
Further, the priming device includes a plurality of reservoirs, a stirred tank in communication with the plurality of reservoirs, a first flow meter in communication with the stirred tank, and a priming pump.
Further, the plurality of repairing agents are three repairing agents, the three repairing agents are respectively a microbial inoculum, a sodium bicarbonate solution and a nutrient solution, the plurality of storage tanks are three, and the three storage tanks respectively store the microbial inoculum, the sodium bicarbonate solution and the nutrient solution.
In the invention, after three repairing agents in three storage tanks are mixed and compounded by a mixing and stirring box according to a proper proportion, the repairing agents are injected into underground water by an injection pump through an in-situ injection well group, so that a high-concentration pollution area is repaired in situ.
Further, the microbial inoculum comprises heterotrophic nitrification-aerobic denitrification (HNAD) bacteria, and the heterotrophic nitrification-aerobic denitrification (HNAD) bacteria are at least one of Pseudomonas and Alcaligenes.
In the invention, the heterotrophic nitrification aerobic denitrifying bacteria can realize synchronous removal of ammonia nitrogen and nitrate nitrogen only by adjusting the concentration of underground water DO (dissolved oxygen) and carbon source, and are easier to regulate and control.
Further, the aeration device comprises a gas cylinder, a micro-nano bubble machine communicated with the gas cylinder, and a second flowmeter communicated with the micro-nano bubble machine; or the aeration device comprises an air compressor and a second flowmeter communicated with the air compressor.
In the invention, the aeration device is used for aerating and aerating the underground water, which is favorable for removing the pollutants in the underground water, and furthermore, the micro-nano bubble machine and the air bottle are used for aerating and aerating the underground water, so that the aeration effect is better.
Further, the reactive wall units are filled with active fillers, so that groundwater pollution flowing through the reactive wall is passively removed, the reactive wall units are used for deep restoration of the tail end of groundwater, and the quality of the underground water in the field is ensured to reach the standard. The active filler comprises zeolite, biochar and slow-release oxidant. The zeolite and the biochar have better adsorption capacity on ammonia nitrogen and nitrate nitrogen, and the surface is pretreated by microorganisms and matched with the filling of a slow-release oxidant, so that the zeolite and the biochar have a circulating regeneration function, and the adsorption effect is greatly improved. The zeolite adopted by the invention is a renewable zeolite filler, and the adsorbed ammonia nitrogen can be timely degraded and converted by loading microorganisms on the surface of the zeolite and matching with the filling of the slow-release oxidant, so that the active adsorption sites of the zeolite are released, the service life of the reaction wall can be greatly prolonged, and the operation and maintenance cost can be reduced.
Further, the plurality of monitoring wells includes a first monitoring well and a second monitoring well, a third monitoring well, a fourth monitoring well, a fifth monitoring well, and a plurality of on-line monitoring devices, the first monitoring well is disposed upstream of the contamination barrier unit, the second monitoring well is disposed between the contamination barrier unit and the in-situ remediation unit, the third monitoring well is disposed inside the in-situ remediation unit, the fourth monitoring well is disposed between the in-situ remediation unit and the reactive wall unit, the fifth monitoring well is disposed downstream of the reactive wall unit, and each monitoring well is equipped with the on-line monitoring device.
In the invention, the water quality monitoring unit is adopted to monitor the water quality parameters on line, so that the injection parameters of the three compound agents can be intelligently regulated, the growth and metabolism conditions of microorganisms are continuously ensured, and the repairing effect is improved.
The second aspect of the present invention provides a groundwater pollution remediation method, which adopts the groundwater pollution remediation system, the groundwater pollution remediation method comprises the following steps:
s1, setting a pollution blocking unit at the upstream of a groundwater pollution area, setting an in-situ repair unit in the groundwater pollution area, setting a reaction wall unit at the downstream of the groundwater pollution area, and setting detection wells at the pollution blocking unit, the in-situ repair unit, the upstream and downstream of the reaction wall unit and the inside of the in-situ repair unit;
s2, after the repairing agents in the three storage tanks are mixed and compounded in proportion through a mixing stirring box, the repairing agents are injected into polluted underground water through an in-situ injection well group by using an injection pump, so that in-situ repairing of a high-concentration pollution area is realized;
S3, carrying out aeration oxygenation on the groundwater pollution area by adopting an aeration device;
s4, filling the reactive filler into the reactive wall unit, removing the pollutants of the underground water flowing through the reactive wall, and being used for deep restoration of the tail end of the underground water and ensuring that the quality of the underground water reaches the standard.
S5, the water quality monitoring unit monitors indexes of the water level, pH, DO (dissolved oxygen), ammonia nitrogen, nitrate nitrogen, nitrite nitrogen and COD (chemical oxygen demand) of underground water in real time, tracks and evaluates the operation effect of the repairing system, if the water quality reaches the standard, the repairing is finished, and if the water quality does not reach the standard, the compound proportion of the repairing agent is timely adjusted, and then the repairing is carried out.
According to the groundwater pollution remediation method provided by the invention, the groundwater pollution remediation system is adopted, so that the groundwater pollution remediation method integrating pollution blocking, in-situ targeting remediation, terminal deep remediation and on-line tracking and monitoring is formed, and the polluted groundwater can be treated rapidly, efficiently and timely.
Further, after the aeration and oxygenation of the underground water, the concentration of the underground water DO is more than 2mg/L, wherein the aeration mode can adopt modes such as air or oxygen aeration, air or oxygen micro-nano bubble aeration and the like, and the effective time of single aeration and oxygenation is as follows in sequence: oxygen micro-nano bubble aeration > air micro-nano bubble aeration > oxygen aeration > air aeration; preferably, after aeration and oxygenation of the underground water, the optimal DO concentration of the underground water is 4-5 mg/L, so that nitrogen pollution of ammonia nitrogen and nitrate in the underground water can be better removed.
Compared with the prior art, the invention has the following technical effects:
(1) The underground water pollution restoration system provided by the invention forms an underground water pollution restoration method integrating pollution blocking, in-situ targeting restoration, tail end deep restoration and on-line tracking and monitoring through arranging the pollution blocking unit, the in-situ restoration unit, the reaction wall unit and the water quality monitoring unit, can quickly, efficiently and timely treat polluted underground water, and has better technical and economic applicability to pollution sites such as ion type rare earth mines, household garbage landfills and the like with serious pollution of underground water ammonia nitrogen and nitrate nitrogen.
(2) The microbial inoculum adopted by the in-situ injection is derived from activated sludge and is obtained by domestication according to the highest pollutant concentration of a field, the source is wide, the cost is low, the culture process is simple, the domestication period is short, and the microbial inoculum is a mixed strain mainly comprising heterotrophic nitrification aerobic denitrifying bacteria, so that the microbial inoculum is more suitable for groundwater environment conditions than a single strain.
(3) Compared with the traditional nitrifying bacteria and denitrifying bacteria sequencing batch reaction, the heterotrophic nitrifying aerobic denitrifying bacteria are adopted, the aerobic and anaerobic conditions of the underground water DO not need to be repeatedly switched, the established dominant bacterial community structure of the underground water does not need to be changed, ammonia nitrogen and nitrate nitrogen can be synchronously removed only through adjusting the concentration of underground water DO and carbon sources, and the method is easier to regulate and control.
(4) The reaction wall unit adopts the renewable zeolite filler, and the adsorbed ammonia nitrogen can be timely degraded and converted by loading microorganisms on the surface of the zeolite and matching with the filling of the slow-release oxidant, so that the active adsorption sites of the zeolite are released, the service life of the reaction wall can be greatly prolonged, and the operation and maintenance cost can be reduced.
(5) The water quality monitoring unit provided by the invention realizes on-line monitoring of a plurality of water quality indexes such as underground water target pollutants, reaction byproducts, related water quality parameters and the like, and the monitoring result is automatically compared with the optimal reaction conditions of heterotrophic nitrification and aerobic denitrification, so that the injection parameters of the repairing agent of the in-situ repairing unit such as the dosage, the proportion and the like of the repairing agent are intelligently adjusted, the optimal reaction conditions of microbial degradation are effectively ensured, and the repairing effect is improved.
Drawings
FIG. 1 is a schematic diagram of a groundwater pollution remediation system;
FIG. 2 is a schematic diagram of the structure of an in situ repair unit;
FIG. 3 is a flow chart of a groundwater pollution remediation method.
Wherein, the technical characteristics that each reference sign indicates are as follows:
1. a contamination barrier unit; 3. a reaction wall unit; 2-2, a storage tank; 2-3, a stirring box; 2-4, a first flowmeter; 2-5, a liquid injection pump; 2-6, gas cylinder; 2-7, a micro-nano bubble machine; 2-8, a second flowmeter; 4-1, a first monitoring well; 4-2, a second monitoring well; 4-3, a third monitoring well; 4-4, a fourth monitoring well; 4-5, a fifth monitoring well, 4-6 and on-line monitoring equipment.
The specific embodiment is as follows:
In order to better understand the present solution, a further detailed description of the present solution will be provided below in conjunction with specific embodiments. The process methods used in the examples are conventional methods unless otherwise specified; the materials used, unless otherwise specified, are commercially available.
Example 1
As shown in fig. 1-2, the present embodiment provides a groundwater pollution remediation system, wherein a groundwater pollution area is an area polluted by water ammonia nitrogen and nitrate nitrogen, the groundwater pollution remediation system includes a water quality monitoring unit, a pollution barrier unit 1 disposed upstream of the groundwater pollution area, an in-situ remediation unit disposed in the groundwater pollution area, and a reactive wall unit 3 disposed downstream of the groundwater pollution area.
Specifically, the pollution blocking unit 1 is disposed upstream of the in-situ repair unit 3, and is used for enclosing polluted underground water in a polluted area so as to prevent the polluted underground water from diffusing outwards, thereby preventing clean underground water from being polluted, and the pollution blocking unit 1 in the embodiment is a cement blocking wall which is constructed by cement jet grouting piles. Wherein the cement-based partition wall has a water-cement ratio of 0.8:1-1.5:1, the cement consumption is 50-70 kg/m, and the permeability coefficient is less than 10 -6 cm/s and far lower than that of undisturbed soil.
Specifically, the in-situ remediation unit is arranged in a polluted groundwater area, the in-situ remediation unit comprises a plurality of in-situ injection well groups 2-1, a liquid injection device and an aeration device, wherein the liquid injection device and the aeration device are communicated with the in-situ injection well groups 2-1, the in-situ injection well groups 2-1 are uniformly distributed in the groundwater polluted area, the in-situ injection well groups 2-1 are distributed by quincuncial piles in the embodiment, so that the influence range can cover all high-concentration groundwater polluted areas, the lower part of a well pipe of the in-situ injection well group 2-1 is opened, and the depth of the well pipe of the in-situ injection well group 2-1 covers a target remediation layer.
Further, the liquid injection device comprises a plurality of storage tanks 2-2, a stirring tank 2-3 connected with the storage tanks, a first flowmeter 2-4 connected with the stirring tank 2-3 and a liquid injection pump 2-5, wherein the three storage tanks 2-2 are respectively a microbial inoculum storage tank, a sodium bicarbonate storage tank and a nutrient solution storage tank. The multiple repairing agents are three repairing agents, the three repairing agents are respectively a microbial inoculum, a sodium bicarbonate solution and a nutrient solution, the multiple storage tanks 2-2 are three, and the three storage tanks 2-2 respectively store the microbial inoculum, the sodium bicarbonate solution and the nutrient solution.
Specifically, a storage tank of the microbial inoculum is filled with domesticated and cultured activated sludge, and a culture medium comprises (NH4)2SO4、C6H12O6、Na2HPO4、KH2PO4、MgSO4、KCl and part of microelements. The culture conditions are mud-water ratio 1:3, pH=7.5+/-0.5, temperature 30+/-2 ℃, and stirring and aeration are continuously carried out to ensure that DO concentration is 2-2.5 mg/L. In the domestication process, after total nitrogen is reduced to below 5mg/L, standing bacterial sludge suspension, replacing supernatant, supplementing culture medium, gradually increasing (NH 4)2SO4 concentration to the site highest pollution concentration, ensuring that the domesticated bacterial agent has good growth adaptability and reaction activity for high-concentration ammonia nitrogen and nitrate nitrogen, wherein the bacterial agent domestication period is about 10-15 days, the domesticated activated sludge takes heterotrophic nitrification-aerobic denitrification (HNAD) bacteria such as Pseudomonas, alcaligenes and the like as main dominant strains, the effective strain content is more than 10 7 CFU/g, and nitrification and denitrification reactions can be simultaneously carried out under aerobic conditions to promote the common conversion of organic matters and nitrogen-containing compounds, and the reaction principle is shown as the following formula:
Specifically, the sodium bicarbonate storage tank is provided with sodium bicarbonate aqueous solution, and aiming at acidic or alkaline underground water, the sodium bicarbonate aqueous solution can be used as pH buffer solution for adjusting the pH value of the underground water to be kept between 6.5 and 8.5.
Specifically, the nutrient solution storage tank is filled with a C 6H12O6、Na2HPO4、KH2PO4、MgSO4, KCl and trace element compound solution, and is used for providing a carbon source and nutrient salt required for microorganism metabolism and promoting heterotrophic nitrification and aerobic denitrification.
In the implementation, after the repairing agents in the three storage tanks are mixed and compounded through the mixing and stirring tank 2-3 according to a proper proportion, the repairing agents are injected into underground water through the in-situ injection well group 2-1 by using the injection pump 2-5, so that a polluted area of high-concentration nitrogen is repaired in situ. Wherein, the compounding proportion of each repairing agent can be dynamically adjusted according to the tracking and monitoring results of various water quality indexes of the underground water, preferably, the C/N proportion is 3-5, and the pH is 7-8.
Specifically, the aeration device is used for aeration and oxygenation of groundwater, wherein the aeration mode can adopt modes such as air or oxygen aeration, air or oxygen micro-nano bubble aeration and the like, and in the embodiment, the oxygen micro-nano bubble aeration is adopted, so that the oxygenation effect is better. The aeration device in the embodiment comprises a gas cylinder 2-6, a micro-nano bubble machine 2-7 communicated with the gas cylinder 2-6, and a second flowmeter 2-8 communicated with the micro-nano bubble machine 2-7, wherein after aeration and oxygenation are carried out on underground water through the aeration device, the DO concentration of the underground water is 4-5 mg/L, and nitrogen pollution of ammonia nitrogen and nitrate in the underground water can be removed better.
Specifically, the reaction wall unit 3 is disposed downstream of the in-situ repair unit, that is: the reaction wall unit 3 is filled with active filler, and the underground water pollution flowing through the reaction wall is passively removed, so that the underground water quality of underground water in the field is ensured to reach the standard. The active filler comprises zeolite, biochar and slow-release oxidant. The zeolite and the biochar have better adsorption capacity on ammonia nitrogen and nitrate nitrogen, and the surface is pretreated by microorganisms and matched with the filling of a slow-release oxidant, so that the zeolite and the biochar have a circulating regeneration function, and the adsorption effect is greatly improved. The zeolite adopted in the embodiment is a renewable zeolite filler, and the adsorbed ammonia nitrogen can be timely degraded and converted by loading microorganisms on the surface of the zeolite and matching with the filling of a slow-release oxidant, so that the active adsorption sites of the zeolite are released, the service life of the reaction wall can be greatly prolonged, and the operation and maintenance cost can be reduced.
Specifically, the water quality monitoring unit comprises a first monitoring well 4-1, a second monitoring well 4-2, a third monitoring well 4-3, a fourth monitoring well 4-4, a fifth monitoring well 4-5 and a plurality of online monitoring devices 4-6, wherein the first monitoring well 4-1 is arranged at the upstream of the pollution barrier unit 1, the second monitoring well 4-2 is arranged between the pollution barrier unit 1 and the in-situ repair unit, and the first monitoring well 4-1 and the second monitoring well 4-2 can be used for evaluating the barrier effect of the pollution barrier unit; the third monitoring well 4-3 is arranged in the middle of the in-situ remediation unit, the fourth monitoring well 4-4 is arranged between the in-situ remediation unit and the reaction wall unit, the second monitoring well 4-2, the third monitoring well 4-3 and the fourth monitoring well 4-4 are used for evaluating the remediation effect of the in-situ remediation unit, the fifth monitoring well 4-5 is arranged at the downstream of the reaction wall unit 3, the fourth monitoring well 4-4 and the downstream monitoring well 4-5 are used for evaluating the remediation effect of the reaction wall unit 2, each monitoring well is provided with a wired monitoring device 4-6, the indexes such as the water level, the pH value, the DO, the ammonia nitrogen, the nitrate nitrogen, the nitrite nitrogen and the COD of the underground water can be monitored in real time, the operation effect of the remediation system is evaluated, and the parameters of the in-situ remediation technology are timely adjusted.
Example 2
The embodiment provides a small test carried out in a laboratory, wherein sludge from a domestic sewage treatment plant is taken for domestication culture to obtain a microbial agent, and a microbial 16S sequencing result shows that Heterotrophic Nitrification Aerobic Denitrification (HNAD) bacteria such as Pseudomonas, alcaligenes and the like are main dominant bacteria. The test results of the nitrification-denitrification batch show that the microbial inoculum can remove 80 percent of ammonia nitrogen and 90 percent of nitrate nitrogen in 5 days under the aerobic condition, thereby proving that the synchronous removal of ammonia nitrogen and nitrate nitrogen can be realized by adopting Heterotrophic Nitrification and Aerobic Denitrification (HNAD) bacteria such as Pseudomonas, alcaligenes and the like.
Example 3:
The embodiment provides a pilot test carried out in a large sand box, wherein the specification of the sand box is 6m long, 1.12m wide and 2.5m high, the filling thickness is 2m, and an in-situ injection well, a reaction wall unit and a monitoring well are arranged to carry out an underground water ammonia nitrogen and nitrate nitrogen pollution repair simulation test. The result shows that after 20 days of reaction, heterotrophic Nitrification and Aerobic Denitrification (HNAD) bacteria are gradually enriched in the box aquifer, the ammonia nitrogen removal rate of the in-situ repair unit is 60.1%, the nitrate nitrogen removal rate is 91.6%, the ammonia nitrogen and nitrate nitrogen removal rates of the reaction wall units are both over 90%, and no toxic byproducts are generated.
Example 4
As shown in fig. 1-3, an embodiment provides a method for repairing pollution of groundwater ammonia nitrogen and nitrate nitrogen in an ionic rare earth mining area, which comprises the following steps:
S1, setting a pollution blocking unit 1 at the upstream of a groundwater pollution area, setting an in-situ repair unit in the groundwater pollution area, setting a reaction wall unit 3 at the downstream of the groundwater pollution area, and setting detection wells at the upstream and downstream of the pollution blocking unit 1, the in-situ repair unit and the reaction wall unit 3 and in the in-situ repair unit;
S2, after the repairing agents in the three storage tanks 2-2 are mixed and compounded in proportion through the mixing stirring tank 2-3, the repairing agents are injected into a polluted underground water area through the in-situ injection well group 2-1 by using the injection pump 2-5, so that the in-situ repairing of the polluted area with high-concentration nitrogen is realized;
S3, an aeration device is used for aeration and oxygenation of the polluted underground water, and after the underground water is aerated and oxygenated, the concentration of the underground water DO is 4mg/L;
s4, filling the reactive filler in the reactive wall unit 3, removing the pollutants of the underground water flowing through the reactive wall, and being used for deep restoration of the tail end of the underground water and ensuring that the quality of the underground water reaches the standard.
S5, the water quality monitoring unit monitors indexes of the water level, pH, DO, ammonia nitrogen, nitrate nitrogen, nitrite nitrogen and COD of the underground water in real time, tracks and evaluates the operation effect of the repairing system, if the water quality reaches the standard, the repairing is finished, and if the water quality does not reach the standard, the compound proportion of the repairing agent is timely adjusted, and then the repairing is carried out.
Wherein, the highest concentration of ammonia nitrogen in underground water of a certain ionic rare earth mining area is about 100mg/L, the highest concentration of nitrate nitrogen is about 50mg/L, and after the repair system is operated for 7 months, the quality of underground water of the site is obviously improved. The concentration of ammonia nitrogen and nitrate nitrogen in the in-situ repair unit groundwater is reduced to below 10mg/L, and the average removal rate is over 80 percent. The average concentration of ammonia nitrogen in underground water at the downstream of the reaction wall unit is reduced to 0.5mg/L, the average concentration of nitrate nitrogen is reduced to 1.3mg/L, the average concentration of nitrite nitrogen after repair is 0.03mg/L, and the average concentration of nitrite nitrogen is lower than the III class standard of the quality standard of underground water (GB/T14848-2017), and no toxic byproducts are generated.
The foregoing is illustrative of the present application, and the protective envelope of the present application is not limited to these specific embodiments, but is defined by the claims herein. It will be apparent to those skilled in the art that the present application is not limited to the embodiments described herein, but is intended to cover such alternatives and modifications as may be included within the spirit and scope of the application.
Claims (6)
1. The groundwater pollution repair system is characterized by comprising a water quality monitoring unit, a pollution blocking unit (1) arranged at the upstream of a groundwater pollution area, an in-situ repair unit arranged in the groundwater pollution area and a reaction wall unit (3) arranged at the downstream of the groundwater pollution area;
The pollution blocking unit (1) is arranged at the upstream of the in-situ restoration unit and is used for enclosing polluted underground water in a polluted area;
The in-situ remediation unit comprises a plurality of in-situ injection well groups (2-1) and a liquid injection device communicated with the in-situ injection well groups (2-1), wherein the in-situ injection well groups (2-1) are uniformly distributed in a groundwater pollution area; the lower part of a well pipe of the in-situ injection well group (2-1) is provided with a sieve, the depth of the sieve covers a target repair layer, and the liquid injection device injects a plurality of repair agents into polluted underground water through the in-situ injection well group (2-1);
the reaction wall unit (3) is arranged at the downstream of the in-situ repair unit, and the reaction wall unit (3) is filled with active filler;
the water quality monitoring unit comprises a plurality of monitoring wells which are respectively arranged at the upper stream and the lower stream of the pollution blocking unit (1), the in-situ remediation unit, the reaction wall unit (3) and the inside of the in-situ remediation unit;
the groundwater pollution area is an area polluted by ammonia nitrogen and nitrate nitrogen;
The liquid injection device comprises a plurality of storage tanks (2-2), a stirring tank (2-3) communicated with the storage tanks (2-2), a first flowmeter (2-4) communicated with the stirring tank (2-3) and a liquid injection pump (2-5);
The plurality of repairing agents are three repairing agents, wherein the three repairing agents are respectively a microbial inoculum, a sodium bicarbonate solution and a nutrient solution, the plurality of storage tanks (2-2) are three, and the three storage tanks (2-2) respectively store the microbial inoculum, the sodium bicarbonate solution and the nutrient solution;
the microbial inoculum comprises heterotrophic nitrification aerobic denitrifying bacteria, wherein the heterotrophic nitrification aerobic denitrifying bacteria are at least one of pseudomonas and alcaligenes;
the active filler comprises zeolite, biochar and a slow-release oxidant; the zeolite is a renewable zeolite filler.
2. Groundwater pollution remediation system according to claim 1, characterized in that the pollution barrier unit (1) is a cement barrier wall built from cement jet grouting piles.
3. Groundwater pollution remediation system according to claim 1, characterized in that the in situ remediation unit further comprises an aeration device in communication with the plurality of in situ injection well groups (2-1), the aeration device comprising a gas cylinder (2-6), a micro-nano bubble machine (2-7) in communication with the gas cylinder (2-6), a second flowmeter (2-8) in communication with the micro-nano bubble machine (2-7); or the aeration device comprises an air compressor and a second flowmeter (2-8) communicated with the air compressor.
4. Groundwater pollution remediation system according to claim 1, characterized in that the plurality of monitoring wells comprises a first monitoring well (4-1), a second monitoring well (4-2), a third monitoring well (4-3), a fourth monitoring well (4-4), a fifth monitoring well (4-5) and a plurality of on-line monitoring devices (4-6), the first monitoring well (4-1) being arranged upstream of the pollution barrier unit (1), the second monitoring well (4-2) being arranged between the pollution barrier unit (1) and the in-situ remediation unit, the third monitoring well (4-3) being arranged inside the in-situ remediation unit, the fourth monitoring well (4-4) being arranged between the in-situ remediation unit and the reactive wall unit (3), the fifth monitoring well (4-5) being arranged downstream of the reactive wall unit (3), each monitoring well being equipped with an on-line monitoring device (4-6).
5. A groundwater pollution remediation method using the groundwater pollution remediation system of any one of claims 1 to 4, the groundwater pollution remediation method comprising the steps of:
S1, setting a pollution blocking unit (1) at the upstream of a groundwater pollution area, setting an in-situ repair unit in the groundwater pollution area, setting a reaction wall unit (3) at the downstream of the groundwater pollution area, and setting monitoring wells at the upstream and downstream of the pollution blocking unit (1), the in-situ repair unit and the reaction wall unit (3) and in the in-situ repair unit;
S2, after the repairing agents in the three storage tanks (2-2) are mixed and compounded in proportion through the mixing stirring tank (2-3), the contaminated groundwater is injected into the contaminated groundwater through the in-situ injection well group (2-1) by using the liquid injection pump (2-5), so that the in-situ repairing of the high-concentration contaminated area is realized;
S3, carrying out aeration oxygenation on the groundwater pollution area by adopting an aeration device;
s4, filling active filler in the reaction wall unit (3) to remove groundwater pollutants flowing through the reaction wall, wherein the active filler is used for deeply repairing the tail end of groundwater so as to ensure that the quality of the groundwater reaches the standard;
S5, the water quality monitoring unit monitors the water level of the underground water and indexes of pH, DO, ammonia nitrogen, nitrate nitrogen, nitrite nitrogen and COD in real time, tracks and evaluates the operation effect of the repairing system, if the water quality reaches the standard, the repairing is finished, and if the water quality does not reach the standard, the compound proportion of the repairing agent is timely adjusted, and then the repairing is carried out.
6. The method for repairing groundwater pollution according to claim 5, wherein in step S3, the concentration of dissolved oxygen in groundwater after aeration and oxygenation in the groundwater pollution area is >2mg/L.
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