CN112974494A - In-situ remediation method for underground water - Google Patents
In-situ remediation method for underground water Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000005067 remediation Methods 0.000 title claims abstract description 35
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 45
- 238000002347 injection Methods 0.000 claims abstract description 35
- 239000007924 injection Substances 0.000 claims abstract description 35
- 230000000813 microbial effect Effects 0.000 claims abstract description 34
- 239000002689 soil Substances 0.000 claims abstract description 20
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 17
- 231100000719 pollutant Toxicity 0.000 claims abstract description 17
- 244000005700 microbiome Species 0.000 claims abstract description 15
- 238000012216 screening Methods 0.000 claims abstract description 12
- 238000012258 culturing Methods 0.000 claims abstract description 6
- 230000000593 degrading effect Effects 0.000 claims abstract description 6
- 230000008439 repair process Effects 0.000 claims abstract description 6
- 238000005070 sampling Methods 0.000 claims abstract description 6
- 241000894006 Bacteria Species 0.000 claims description 52
- 239000003673 groundwater Substances 0.000 claims description 23
- 239000002068 microbial inoculum Substances 0.000 claims description 23
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 19
- 230000001546 nitrifying effect Effects 0.000 claims description 15
- 235000015097 nutrients Nutrition 0.000 claims description 10
- 235000016709 nutrition Nutrition 0.000 claims description 8
- 238000005553 drilling Methods 0.000 claims description 5
- 238000003911 water pollution Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 12
- 230000008859 change Effects 0.000 description 5
- 241000108664 Nitrobacteria Species 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 3
- NPCNOMATAMPYNV-UHFFFAOYSA-N S(=O)(=O)(O)[O-].[NH4+].[NH4+].[NH4+].S(=O)(=O)(O)[O-].S(=O)(=O)(O)[O-] Chemical class S(=O)(=O)(O)[O-].[NH4+].[NH4+].[NH4+].S(=O)(=O)(O)[O-].S(=O)(=O)(O)[O-] NPCNOMATAMPYNV-UHFFFAOYSA-N 0.000 description 3
- FLIBMGVZWTZQOM-UHFFFAOYSA-N benzene;sulfuric acid Chemical compound OS(O)(=O)=O.C1=CC=CC=C1 FLIBMGVZWTZQOM-UHFFFAOYSA-N 0.000 description 3
- 229960001701 chloroform Drugs 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—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
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Microbiology (AREA)
- Molecular Biology (AREA)
- Mycology (AREA)
- Biotechnology (AREA)
- Health & Medical Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Processing Of Solid Wastes (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses an in-situ remediation method for underground water, which solves the technical problem that pollutants cannot be guaranteed to be effectively removed during underground water remediation in the prior art. The underground water in-situ remediation method comprises the following steps: (1) sampling the polluted soil, separating and screening indigenous microorganisms from the sampled polluted soil, screening out microorganisms capable of degrading pollutants according to functions, and culturing; (2) and (3) arranging a plurality of injection wells in a polluted area through which the underground water flows, and adding a microbial repairing agent into the injection wells to repair the underground water. The method for in-situ remediation of the underground water is characterized in that a microbial remediation agent is added into the polluted soil through which the underground water flows to carry out remediation of the underground water, corresponding substances are degraded when the underground water passes through the area to which the microbial remediation agent is added, and the polluted underground water can be restored to the original water quality after 3 months to 12 months.
Description
Technical Field
The invention relates to the field of groundwater remediation, in particular to an in-situ remediation method for groundwater.
Background
Underground water is a precious fresh water resource for human beings, but with the continuous development of the social industrialization process, the problems of waste water discharge, industrial waste residues, agricultural irrigation, landfill site leakage, damage of transport pipelines and storage tanks of petrochemical raw materials and the like can cause underground water pollution, so that the problem of water resource shortage which is originally short is more serious, and serious threats and challenges are formed for living health, food safety, drinking water safety, regional ecological environment, sustainable development of economic society and even social stability, and underground water restoration becomes an environmental problem which is currently concerned by the public and the society.
The groundwater remediation refers to the restoration of polluted groundwater to the original water quality by adopting the technologies of extraction, gas stripping, bioremediation, permeation reaction walls and the like.
And (4) extracting, wherein the extraction treatment is to extract the underground water by adopting a water pump, reasonably purify the underground water on the ground and inject the treated water into the underground water or discharge the treated water into a surface water body. The treatment mode can efficiently remove the pollutants in the extracted water, but cannot ensure that the pollutants in all underground water, particularly rock strata are effectively removed.
And gas stripping, namely generating gas flow in a polluted area by utilizing a vacuum pump and a well and utilizing negative pressure induction or positive pressure, converting pollutants in an adsorption state, a dissolution state or a free phase into a gas phase, extracting the gas phase to the ground, and then collecting and treating the gas phase. Typical gas stripping systems include extraction wells, vacuum pumps, moisture separation devices, gas collection devices, gas purification treatment devices, auxiliary equipment and the like. The main advantages of the gas stripping technique include: the method can be operated in situ, is simple and has small interference to the surroundings; effectively removing volatile organic compounds; more polluted underground water can be treated within an acceptable cost range; the system is easy to install and transfer; easy to use with other techniques. In the united states, air stripping technology has become almost the "standard" technology for remediation of underground water and soil contaminated by gas stations. However, the gas stripping technique is only applicable to the formation with better homogeneous permeability, and has limitation.
Permeable reactive barrier, as the management and control measure of groundwater pollution, usually through building waterproof curtain on the groundwater flow, select the perpendicular one section of rivers to build the permeable wall of packing, handle the groundwater pollutant that flows through, finally reach the restoration value that country and local required. However, the permeable reactive barrier is often limited by the large hydrogeological conditions, and has large construction depth, high construction cost and difficult management and maintenance in the area with deep aquifer or unstable water-proof roof.
Disclosure of Invention
The invention aims to provide an underground water in-situ remediation method, which aims to solve the technical problem that pollutants cannot be guaranteed to be effectively removed during underground water remediation in the prior art.
The invention provides an underground water in-situ remediation method, which comprises the following steps:
(1) sampling the polluted soil, separating and screening indigenous microorganisms from the sampled polluted soil, screening out microorganisms capable of degrading pollutants according to functions, and culturing;
(2) the method comprises the steps of finding out the path compensating and draining way and the pollution range of underground water through early-stage hydrogeological survey, drilling an injection well in an underground water pollution area, and constructing injection wells according to the distance of 90-110m2Laying an injection well, wherein the well is deep to a water-resisting layer top plate, and adding a microbial repairing agent into the injection well to repair underground water; the microbial repairing agent comprises a microbial inoculum, and the microbial inoculum is any one or more of sulfate reducing bacteria, nitrifying bacteria and denitrifying bacteria.
Further, in the step (2), the microbial inoculum added into each injection well is 0.2-0.4T.
Further, the microbial inoculum added into each injection well is 0.3T.
Further, in the step (2), the microbial repairing agent further comprises a nutritional agent.
Furthermore, the nutrient added into each injection well is 0.4-0.6T.
Furthermore, the nutrient added into each injection well is 0.5T.
Further, the nutrient is emulsified oil.
Further, the microbial inoculum is sulfate reducing bacteria, nitrifying bacteria and denitrifying bacteria, and the weight ratio of the sulfate reducing bacteria to the nitrifying bacteria to the denitrifying bacteria is 1-2:1-1.5: 1-1.5.
Further, the microbial inoculum is sulfate reducing bacteria, nitrifying bacteria and denitrifying bacteria, and the weight ratio of the sulfate reducing bacteria to the nitrifying bacteria to the denitrifying bacteria is 2:1: 1.5.
Based on the technical scheme, the embodiment of the invention can at least produce the following technical effects:
the method for in-situ remediation of the underground water comprises the steps of adding the microbial remediation agent into the polluted soil through which the underground water flows to restore the underground water, wherein the corresponding substances are degraded when the underground water passes through the area to which the microbial remediation agent is added, the microbial inoculum in the microbial remediation agent can act on the restoration of pollutants, and simultaneously the added nutrient can provide a good growth environment for the microbes, so that the microbial inoculum can act on the polluted soil for a long time to restore the polluted soil for a long time, and the polluted underground water can be restored to the original water quality after 3 months to 12 months according to the weight of the pollution.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Example 1:
an in-situ groundwater remediation method comprises the following steps:
(1) sampling the polluted soil, separating and screening indigenous microorganisms from the sampled polluted soil, screening out microorganisms (sulfate reducing bacteria, nitrifying bacteria and denitrifying bacteria) capable of degrading pollutants according to functions, and culturing;
(2) the method comprises the steps of finding out the path compensating and draining way and the pollution range of underground water through early-stage hydrogeological survey, drilling an injection well in an underground water pollution area, and constructing an injection well according to the distance of 110m2Laying an injection well, wherein the well is deep to a water-resisting layer top plate, and adding a microbial repairing agent into the injection well to repair underground water; the microbial repairing agent comprises microbial inoculum and nutritional agent, wherein the microbial inoculum is sulfate reducing bacteria and nitrifying bacteriaBacteria and denitrifying bacteria, wherein the weight ratio of sulfate reducing bacteria to nitrifying bacteria to denitrifying bacteria is 2:1:1.5, and the nutrient is emulsified oil; the microbial inoculum added into each injection well is 0.2T, and the nutrient added into each injection well is 0.4T.
The change of the pollutant content in the groundwater during the soil remediation process is shown in the following table 1:
TABLE 1 pollutant content change in groundwater (unit: mg/L)
| Permanganate salt | Ammonia nitrogen | Sulfates of sulfuric acid | Benzene and its derivatives | Trichloromethane | |
| Microorganism repairing agent without adding | 6.8 | 2.2 | 287.2 | 19.5 | 76.1 |
| Adding the microbial repairing agent for 3 days | 6.8 | 2.0 | 285.1 | 19.0 | 75.8 |
| Adding the microbial repairing agent for 10 days | 6.2 | 1.6 | 270.9 | 17.2 | 69.4 |
| Adding the microbial repairing agent for 30 days | 5.2 | 0.8 | 247.4 | 12.7 | 58.3 |
| Adding the microbial repairing agent for 90 days | 2.3 | 0.4 | 223.0 | 9.1 | 50.2 |
| Standard water quality | 3.0 | 0.5 | 250.0 | 10.0 | 60.0 |
Example 2:
an in-situ groundwater remediation method comprises the following steps:
(1) sampling the polluted soil, separating and screening indigenous microorganisms from the sampled polluted soil, screening out microorganisms (sulfate reducing bacteria, nitrifying bacteria and denitrifying bacteria) capable of degrading pollutants according to functions, and culturing;
(2) the method comprises the steps of finding out the path compensating and draining way and the pollution range of underground water through early-stage hydrogeological survey, drilling an injection well in the polluted area of the underground water, and constructing an injection well according to the distance of 100m2Laying an injection well, wherein the well is deep to a water-resisting layer top plate, and adding a microbial repairing agent into the injection well to repair underground water; the microbial repairing agent comprises a microbial inoculum and a nutritional agent, wherein the microbial inoculum is sulfate reducing bacteria, nitrobacteria and denitrifying bacteria, the weight ratio of the sulfate reducing bacteria to the nitrobacteria to the denitrifying bacteria is 1:1:1, and the nutritional agent is emulsified oil; the microbial inoculum added into each injection well is 0.3T, and the nutrient added into each injection well is 0.5T.
The change in the contaminant content of the groundwater during the soil remediation process is shown in table 2 below:
TABLE 2 pollutant content change in groundwater (unit: mg/L)
| Permanganate salt | Ammonia nitrogen | Sulfates of sulfuric acid | Benzene and its derivatives | Trichloromethane | |
| Microorganism repairing agent without adding | 22.1 | 6.7 | 366.3 | 31.4 | 101.2 |
| Adding the microbial repairing agent for 3 days | 21.3 | 5.9 | 359.7 | 27.3 | 100.0 |
| Adding the microbial repairing agent for 10 days | 17.7 | 4.8 | 343.9 | 24.8 | 99.8 |
| Adding the microbial repairing agent for 30 days | 10.2 | 1.9 | 332.8 | 15.7 | 84.9 |
| Adding the microbial repairing agent for 90 days | 6.8 | 0.5 | 260.4 | 11.1 | 77.2 |
| Adding the microbial repairing agent for 180 days | 1.8 | 0.2 | 117.0 | 7.8 | 54.2 |
| Standard water quality | 3.0 | 0.5 | 250.0 | 10.0 | 60.0 |
Example 3:
an in-situ groundwater remediation method comprises the following steps:
(1) sampling the polluted soil, separating and screening indigenous microorganisms from the sampled polluted soil, screening out microorganisms (sulfate reducing bacteria, nitrifying bacteria and denitrifying bacteria) capable of degrading pollutants according to functions, and culturing;
(2) the method comprises the steps of finding out the path compensating and draining way and the pollution range of underground water through early-stage hydrogeological survey, drilling a hole in an underground water pollution area, and constructing an injection well according to the distance of 90m2Laying an injection well, wherein the well is deep to a water-resisting layer top plate, and adding a microbial repairing agent into the injection well to repair underground water; the microbial repairing agent comprises a microbial inoculum and a nutritional agent, wherein the microbial inoculum is sulfate reducing bacteria, nitrobacteria and denitrifying bacteria, the weight ratio of the sulfate reducing bacteria to the nitrobacteria to the denitrifying bacteria is 1:1.5:1, and the nutritional agent is emulsified oil; the microbial inoculum added into each injection well is 0.4T, and the nutrient added into each injection well is 0.6T.
The change in the contaminant content of the groundwater during the soil remediation process is shown in table 3 below:
TABLE 3 pollutant content in groundwater (unit: mg/L)
| Permanganate salt | Ammonia nitrogen | Sulfates of sulfuric acid | Benzene and its derivatives | Trichloromethane | |
| Microorganism repairing agent without adding | 45.7 | 11.2 | 553.9 | 54.3 | 188.1 |
| Adding the microbial repairing agent for 3 days | 43.9 | 11.2 | 520.1 | 49.7 | 186.4 |
| Adding the microbial repairing agent for 10 days | 38.8 | 9.4 | 487.3 | 42.5 | 177.9 |
| Adding the microbial repairing agent for 30 days | 32.4 | 8.7 | 421.1 | 40.3 | 151.8 |
| Adding the microbial repairing agent for 90 days | 20.8 | 5.1 | 322.8 | 29.4 | 88.3 |
| Adding the microbial repairing agent for 180 days | 7.2 | 1.6 | 299.4 | 12.8 | 62.1 |
| Adding the microbial repairing agent 270 days later | 2.5 | 0.9 | 277.2 | 9.6 | 44.7 |
| Adding the microbial repairing agent for 360 days | 1.2 | 0.1 | 121.9 | 8.9 | 30.5 |
| Standard water quality | 3.0 | 0.5 | 250.0 | 10.0 | 60.0 |
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (9)
1. An underground water in-situ remediation method is characterized by comprising the following steps: the method comprises the following steps:
(1) sampling the polluted soil, separating and screening indigenous microorganisms from the sampled polluted soil, screening out microorganisms capable of degrading pollutants according to functions, and culturing;
(2) the method comprises the steps of finding out the path compensating and draining way and the pollution range of underground water through early-stage hydrogeological survey, drilling an injection well in an underground water pollution area, and constructing injection wells according to the distance of 90-110m2Laying an injection well, wherein the well is deep to a water-resisting layer top plate, and adding a microbial repairing agent into the injection well to repair underground water; the microbial repairing agent comprises a microbial inoculum, and the microbial inoculum is any one or more of sulfate reducing bacteria, nitrifying bacteria and denitrifying bacteria.
2. An in situ groundwater remediation method as claimed in claim 1, wherein: in the step (2), the microbial inoculum added into each injection well is 0.2-0.4T.
3. An in situ groundwater remediation method as claimed in claim 2, wherein: the microbial inoculum added in each injection well is 0.3T.
4. An in situ groundwater remediation method as claimed in claim 1, wherein: in the step (2), the microbial repairing agent further comprises a nutritional agent.
5. An in situ groundwater remediation method as claimed in claim 4, wherein: the nutrient added into each injection well is 0.4-0.6T.
6. An in situ groundwater remediation method as claimed in claim 5, wherein: the nutrient added into each injection well is 0.5T.
7. An in situ groundwater remediation method as claimed in any one of claims 4 to 6 wherein: the nutritional agent is emulsified oil.
8. An in situ groundwater remediation method as claimed in claim 1, wherein: the microbial inoculum is sulfate reducing bacteria, nitrifying bacteria and denitrifying bacteria, and the weight ratio of the sulfate reducing bacteria to the nitrifying bacteria to the denitrifying bacteria is 1-2:1-1.5: 1-1.5.
9. An in situ groundwater remediation method as claimed in claim 8, wherein: the microbial inoculum is sulfate reducing bacteria, nitrifying bacteria and denitrifying bacteria, and the weight ratio of the sulfate reducing bacteria to the nitrifying bacteria to the denitrifying bacteria is 2:1: 1.5.
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