CN114850201B - In-situ bioremediation method for combined treatment of gas-coated belt and saturated belt - Google Patents
In-situ bioremediation method for combined treatment of gas-coated belt and saturated belt Download PDFInfo
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- CN114850201B CN114850201B CN202210586333.1A CN202210586333A CN114850201B CN 114850201 B CN114850201 B CN 114850201B CN 202210586333 A CN202210586333 A CN 202210586333A CN 114850201 B CN114850201 B CN 114850201B
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- 229920006395 saturated elastomer Polymers 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 68
- 230000008439 repair process Effects 0.000 claims abstract description 38
- 239000011159 matrix material Substances 0.000 claims abstract description 26
- 239000003124 biologic agent Substances 0.000 claims abstract description 12
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 8
- 230000015556 catabolic process Effects 0.000 claims abstract description 8
- 150000008280 chlorinated hydrocarbons Chemical class 0.000 claims abstract description 8
- 238000006731 degradation reaction Methods 0.000 claims abstract description 8
- 229910001882 dioxygen Inorganic materials 0.000 claims abstract description 8
- 230000000694 effects Effects 0.000 claims abstract description 7
- 230000000644 propagated effect Effects 0.000 claims abstract description 7
- 239000002689 soil Substances 0.000 claims description 33
- 241000894006 Bacteria Species 0.000 claims description 22
- 238000012544 monitoring process Methods 0.000 claims description 21
- 235000015097 nutrients Nutrition 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000000126 substance Substances 0.000 claims description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 14
- 239000001301 oxygen Substances 0.000 claims description 14
- 229910052760 oxygen Inorganic materials 0.000 claims description 14
- 239000002680 soil gas Substances 0.000 claims description 12
- 238000005067 remediation Methods 0.000 claims description 11
- 239000003344 environmental pollutant Substances 0.000 claims description 8
- 231100000719 pollutant Toxicity 0.000 claims description 8
- 150000001555 benzenes Chemical class 0.000 claims description 6
- 150000003863 ammonium salts Chemical class 0.000 claims description 3
- 229910002651 NO3 Inorganic materials 0.000 claims description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- 244000005700 microbiome Species 0.000 abstract description 13
- 235000016709 nutrition Nutrition 0.000 abstract description 4
- 125000001997 phenyl group Chemical class [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 abstract 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 26
- 239000000243 solution Substances 0.000 description 19
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 18
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 12
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 12
- 235000011130 ammonium sulphate Nutrition 0.000 description 12
- 239000007788 liquid Substances 0.000 description 10
- 239000001294 propane Substances 0.000 description 9
- 238000003860 storage Methods 0.000 description 9
- 239000003673 groundwater Substances 0.000 description 8
- CFXQEHVMCRXUSD-UHFFFAOYSA-N 1,2,3-Trichloropropane Chemical compound ClCC(Cl)CCl CFXQEHVMCRXUSD-UHFFFAOYSA-N 0.000 description 4
- 239000002957 persistent organic pollutant Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000035764 nutrition Effects 0.000 description 3
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 241000736262 Microbiota Species 0.000 description 1
- 102000008109 Mixed Function Oxygenases Human genes 0.000 description 1
- 108010074633 Mixed Function Oxygenases Proteins 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
- 231100001231 less toxic Toxicity 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000003895 organic fertilizer Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000001706 oxygenating effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 239000003440 toxic substance 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
-
- 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
-
- 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
Abstract
The embodiment of the invention provides an in-situ biological repair method for combined treatment of a gas-covered zone and a saturated zone, after an aerobic biological agent and a nutritional aid are simultaneously injected into repair wells of the gas-covered zone and the saturated zone, a mixed gas of oxygen gas and matrix gas required by microorganisms is injected into the repair wells of the saturated zone, and part of the injected mixed gas enters the gas-covered zone from the saturated zone so as to be utilized by the aerobic biological agent injected into the gas-covered zone. The injected aerobic biological agent can be propagated and grown by using matrix gas, has good co-metabolism degradation effect on chlorinated hydrocarbon or benzene series and the like under the aerobic condition, and finally achieves the aim of combined treatment and repair of an air-covering zone and a saturated zone.
Description
Technical Field
The embodiment of the invention relates to the technical field of soil and groundwater pollution treatment, in particular to an in-situ bioremediation method for combined treatment of a gas-covered zone and a saturated zone, which can be used for simultaneously remediating the gas-covered zone soil, the saturated zone soil and groundwater.
Background
The soil bioremediation technology is a remediation technology for converting pollutants into non-toxic substances by means of biodegradation of organic pollutants in soil by microorganisms. Microorganisms degrade organic pollutants by direct metabolism or co-metabolism, degrading the organic pollutants into less toxic pollutants or completely degrading the pollutants into carbon dioxide and water.
Patent document CN104607460a provides a bioremediation method of organic-contaminated soil, which mainly comprises stirring and crushing the soil; adding organic fertilizer and nutrient substances into soil and uniformly mixing; adding water to regulate the humidity of soil; adding specific high-efficiency microorganisms, a catalyst and a surfactant; aerating and oxygenating soil, and collecting and treating tail gas; and (5) sampling and detecting regularly. The method belongs to an ectopic bioremediation method, and has high remediation cost.
Patent document CN100553809C provides a method for repairing organic contaminated soil by in-situ microorganisms, which comprises screening and establishing functional microbiota, adding functional microorganisms, and controlling repairing conditions in stages. The method prolongs the survival time of functional microorganisms and improves the degradation rate of organic pollutants. The method adopts a method of disturbing soil at high frequency (80-130 times/day) to mix the medicament into the soil and enable oxygen in the air to enter the soil. The method has limited pollution depth; complicated operation, and difficult large-area popularization and use; because the contaminated soil is a solid phase, there is non-uniformity in treatment.
Patent CN105753178A discloses a method for reinforcing microorganism in-situ remediation of chlorinated hydrocarbon polluted groundwater, which needs to inject a large amount of weak acid ferric ammonium salt as a reducing agent into groundwater, and has limited remediation efficiency because of lack of reinforcing effect of exogenous microorganism, and the technology can only treat saturated zone area, and can not repair air-covered polluted soil.
Disclosure of Invention
Therefore, the embodiment of the invention provides an in-situ bioremediation method for combined treatment of a gas-covered belt and a saturated belt, which aims to solve the technical problem of how to achieve the aim of combined treatment and remediation of the gas-covered belt and the saturated belt.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
the embodiment of the application provides an in-situ bioremediation method for combined treatment of a gas-wrapping belt and a saturated belt, which comprises the following steps:
1) Respectively arranging a repairing well group on the gas-wrapping band and the saturation band;
2) Arranging soil gas monitoring well groups in the gas-wrapping zone, and arranging underground water monitoring well groups in the saturated zone;
3) Pressurizing and injecting nutrient substances into the gas-covered zone repairing well and the saturated zone repairing well respectively;
4) Then, injecting aerobic biological bacteria which are well domesticated for target pollutants into the gas-covered zone repair well and the saturated zone repair well;
5) Each gas-coated zone repair well and saturated zone repair well intermittently inject nutrient substances in small dose, so that the concentration of the nutrient substances reaches more than 2 mg/L;
6) And continuously or intermittently injecting compressed mixed gas of oxygen gas and matrix gas into the saturated zone restoration well to ensure that the content of the matrix gas in the soil gas monitoring well is maintained to be more than 2 percent until the gas-covered zone soil, the saturated zone soil and the underground water reach the standard.
After injecting the substance in steps 3), 4), and 5), there is a step of injecting a compressed gas so that the injected substance diffuses into the surrounding soil.
The nutrient substances are ammonium salt, nitrate or phosphate.
The aerobic gas may be air or oxygen, and the matrix gas may be methane or propane, etc.
The aerobic biological agent needs to be screened and domesticated in advance, can be propagated and grown by using matrix gas (such as methane or propane, and the like), and has good co-metabolism degradation effects on chlorinated hydrocarbon or benzene series, and the like under the aerobic condition, for example: methane oxidizing bacteria are propagated and grown by using methane to generate monooxygenase, and have good co-metabolism degradation effects on chlorinated hydrocarbons (such as trichloroethylene and the like) or benzene series (such as benzene, toluene and the like) and the like.
Further, the gas-covered zone repair well and the saturated zone repair well are multifunctional injection wells, and can be used for injecting nutrient substances and aerobic biological bacteria under pressure and injecting compressed mixed gas of oxygen gas and matrix gas.
Compared with the prior art, the embodiment of the invention provides an in-situ bioremediation method for combined treatment of a gas-covered zone and a saturated zone, after an aerobic biological agent and a nutrition aid are simultaneously injected into a remediation well of the gas-covered zone and the saturated zone, mixed gas of oxygen gas and matrix gas required by microorganisms is injected into the remediation well of the saturated zone, and part of the injected mixed gas enters the gas-covered zone from the saturated zone so as to be utilized by the aerobic biological bacteria injected into the gas-covered zone. The injected aerobic biological agent can be propagated and grown by using matrix gas, has good co-metabolism degradation effect on chlorinated hydrocarbon or benzene series and the like under the aerobic condition, and finally achieves the aim of combined treatment and repair of an air-covering zone and a saturated zone.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the invention, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present invention, should fall within the ambit of the technical disclosure.
FIG. 1 is a schematic diagram of an in-situ bioremediation method for combined treatment of a gas-coated zone and a saturated zone according to an embodiment of the present invention.
Detailed Description
Other advantages and advantages of the present invention will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to solve the technical problems, the embodiment of the invention discloses an in-situ bioremediation method for combined treatment of a gas-wrapping belt and a saturated belt, which specifically comprises the following steps:
1) Respectively arranging a repairing well group on the gas-wrapping band and the saturation band;
2) Arranging soil gas monitoring well groups in the gas-wrapping zone, and arranging underground water monitoring well groups in the saturated zone;
3) Pressurizing and injecting nutrient substances into the gas-covered zone repairing well and the saturated zone repairing well respectively;
4) Then, injecting aerobic biological bacteria which are well domesticated for target pollutants into the gas-covered zone repair well and the saturated zone repair well;
5) Each gas-coated zone repair well and saturated zone repair well intermittently inject nutrient substances in small dose, so that the concentration of the nutrient substances reaches more than 2 mg/L;
6) And continuously or intermittently injecting compressed mixed gas of oxygen gas and matrix gas into the saturated zone restoration well to ensure that the content of the matrix gas in the soil gas monitoring well is maintained to be more than 2 percent until the gas-covered zone soil, the saturated zone soil and the underground water reach the standard.
Example 1
For a pollution site of a solvent factory, the main pollutant of soil and groundwater is trichloroethylene. As shown in fig. 1, the embodiment of the invention discloses an in-situ bioremediation method for combined treatment of a gas-wrapping belt and a saturated belt, which specifically comprises the following steps:
1) Arranging repairing well groups on the gas-wrapping belt 09 and the saturated belt 10 respectively, wherein the distance between the gas-wrapping belt repairing wells 02 is 3m, and the distance between the saturated belt repairing wells 01 is 6m;
2) Arranging a soil gas monitoring well 07 between two gas-covered zone repairing wells 02, arranging a ground water monitoring well 08 between two saturated zone repairing wells 01, and arranging the soil gas monitoring well 07 and the ground water monitoring well 08 at a density of every 1000 square meters;
3) The nutrient solution storage tank 03 stores a nutrient solution, specifically, in the embodiment of the present invention, the nutrient solution is an ammonium sulfate solution; after 120L of ammonium sulfate (200 mg/L) solution is injected into each of the gas-coated zone repair well 02 and the saturated zone repair well 01 under pressure by adopting a water pump, continuously injecting compressed air for 20 minutes, and rapidly diffusing the ammonium sulfate (200 mg/L) solution into soil around the repair well;
4) The aerobic biological bacteria liquid storage tank 04 stores aerobic biological bacteria liquid, and specifically, in the embodiment of the invention, the aerobic biological bacteria liquid is methane aerobic biological bacteria liquid; pressurizing and injecting 20L of methane aerobic biological bacteria liquid into each of the gas-coated zone repair well 02 and the saturated zone repair well 01 by adopting a water pump, continuously injecting compressed air for 20 minutes, and rapidly diffusing the aerobic biological bacteria into soil around the repair wells;
5) Each of the gas-coated belt repairing well 02 and the saturated belt repairing well 01 was continuously pressurized and injected with an ammonium sulfate (200 mg/L) solution at a flow rate of 1L per minute, and after 60 minutes, was continuously injected with compressed air for 10 minutes, and then was intermittently pressurized and injected with an ammonium sulfate (200 mg/L) solution for 12 hours; circulating in this way, so that the concentration of ammonium sulfate in the underground water monitoring well 08 is maintained above 2 mg/L;
6) The co-metabolizing matrix gas storage tank 05 stores methane matrix gas; the oxygen-containing gas tank 06 stores compressed air; the matrix gas and the oxygen-containing gas generate compressed mixed gas, and each saturated zone repair well 01 is intermittently injected with compressed mixed gas of air and methane (the volume percentage content of methane is 10 percent), so that the methane content in the soil gas monitoring well 07 is maintained to be more than 2 percent until the trichloroethylene in the soil of the gas-covered zone 09, the soil of the saturated zone 10 and the underground water reach the standard.
Example 2
For a polluted site of a certain chemical plant, the main pollutants of soil and underground water are 1,2, 3-trichloropropane. As shown in fig. 1, the embodiment of the invention discloses an in-situ bioremediation method for combined treatment of a gas-wrapping belt and a saturated belt, which specifically comprises the following steps:
1) Arranging repairing well groups on the gas-wrapping belt 09 and the saturated belt 10 respectively, wherein the distance between the gas-wrapping belt repairing wells 02 is 5m, and the distance between the saturated belt repairing wells 01 is 8m;
2) Arranging a soil gas monitoring well 07 between two gas-coated zone repairing wells 02, arranging a groundwater monitoring well 08 between two saturated zone repairing wells 01, and arranging the soil gas monitoring well 07 and the groundwater monitoring well 08 at a density of 2000 square meters;
3) The nutrient solution storage tank 03 stores a nutrient solution, specifically, in the embodiment of the present invention, the nutrient solution is an ammonium sulfate solution; after 200L of ammonium sulfate (500 mg/L) solution is pressurized and injected into each of the gas-coated zone repair well 02 and the saturated zone repair well 01 by adopting a water pump, an oxygen-containing gas storage tank 06 stores oxygen-containing gas, and in the embodiment of the invention, the oxygen-containing gas can be compressed air, the compressed air is continuously injected for 20 minutes, and the ammonium sulfate (500 mg/L) solution is rapidly diffused into soil around the repair well;
4) The aerobic biological bacteria liquid storage tank 04 stores aerobic biological bacteria liquid, and specifically, in the embodiment of the invention, the aerobic biological bacteria liquid is propane aerobic biological bacteria liquid; pressurizing and injecting 20L of propane aerobic biological bacteria liquid into each of the gas-covered zone repair well 02 and the saturated zone repair well 01 by adopting a water pump, and continuously injecting compressed air for 20 minutes through an oxygen-containing gas storage tank 06 so as to quickly diffuse the aerobic biological bacteria into soil around the repair well;
5) After each of the gas-coated belt repairing well 02 and the saturated belt repairing well 01 is continuously pressurized and injected with the ammonium sulfate (200 mg/L) solution for 60 minutes at a flow rate of 1L per minute, compressed air is continuously injected for 10 minutes through the oxygen-containing gas storage tank 06, and then the ammonium sulfate (200 mg/L) solution is intermittently pressurized and injected for 12 hours; circulating in this way, so that the concentration of ammonium sulfate in the underground water monitoring well 08 is maintained above 5 mg/L;
6) The co-metabolizing matrix gas storage tank 05 stores propane matrix gas; the oxygen-containing gas tank 06 stores compressed air; the matrix gas and the oxygen-containing gas generate compressed mixed gas, and each saturated zone repair well 01 is intermittently injected with compressed mixed gas (the volume percentage content of methane is 10 percent) of air and propane, so that the propane content in the soil gas monitoring well 07 is maintained to be more than 2 percent until 1,2, 3-trichloropropane in the soil of the gas-covered zone 09, the soil of the saturated zone 10 and underground water reach the standard.
Compared with the prior art, the in-situ bioremediation method for combined treatment of the gas-covered zone and the saturated zone provided by the embodiment of the application has the advantages that after the aerobic biological agent and the nutrition auxiliary agent are simultaneously injected into the remediation well of the gas-covered zone and the saturated zone, the mixed gas of the oxygen gas and the matrix gas required by microorganisms is injected into the remediation well of the saturated zone, and part of the injected mixed gas enters the gas-covered zone from the saturated zone, so that the mixed gas is utilized by the aerobic biological bacteria injected into the gas-covered zone. The injected aerobic biological agent can be propagated and grown by using matrix gas, has good co-metabolism degradation effect on chlorinated hydrocarbon or benzene series and the like under the aerobic condition, and finally achieves the aim of combined treatment and repair of an air-covering zone and a saturated zone.
In the above embodiment of the present application, a repair well is respectively disposed in the gas-wrapping zone and the saturation zone in the contaminated area, for injecting a nutrient auxiliary solution and an aerobic biological agent (co-metabolizing bacteria), and the repair well is simultaneously used for injecting oxygen or air required by microorganisms and a mixture of co-metabolizing matrix gas (such as methane or propane). The injected aerobic biological agent can be propagated and grown by using matrix gas, and has good co-metabolism degradation effect on chlorinated hydrocarbon or benzene series and the like under the aerobic condition. After the aerobe bacteria and the nutrition auxiliary agent are injected into the repairing well of the gas-covered zone and the saturated zone, the mixed gas of the oxygen gas (such as air or oxygen) and the matrix gas (such as methane or propane and the like) required by microorganisms is injected into the repairing well of the saturated zone, and part of the injected mixed gas enters the gas-covered zone from the saturated zone, so that the mixed gas is utilized by the aerobe bacteria injected into the gas-covered zone. Finally, the purpose of combined treatment and repair of the gas-wrapping belt and the saturated belt is achieved.
While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (2)
1. An in-situ bioremediation method for combined treatment of a gas-coated belt and a saturated belt is characterized by comprising the following steps:
1) Respectively arranging a repairing well group on the gas-wrapping band and the saturation band;
2) Arranging soil gas monitoring well groups in the gas-wrapping zone, and arranging underground water monitoring well groups in the saturated zone;
3) Pressurizing and injecting nutrient substances into the gas-covered zone repairing well and the saturated zone repairing well respectively;
4) Then, injecting aerobic biological bacteria which are well domesticated for target pollutants into the gas-covered zone repair well and the saturated zone repair well; the aerobic biological agent needs to be screened and domesticated in advance, can be propagated and grown by using matrix gas, and has good co-metabolism degradation effect on chlorinated hydrocarbon or benzene series under the aerobic condition;
5) Each gas-coated zone repair well and saturated zone repair well intermittently inject nutrient substances in small dose, so that the concentration of the nutrient substances reaches more than 2 mg/L; the nutrient substances are ammonium salt, nitrate or phosphate;
6) And continuously or intermittently injecting compressed mixed gas of oxygen gas and matrix gas into the saturated zone restoration well to ensure that the content of the matrix gas in the soil gas monitoring well is maintained to be more than 2 percent until the gas-covered zone soil, the saturated zone soil and the underground water reach the standard.
2. The in-situ bioremediation method for combined treatment of a gas-covered zone and a saturated zone of claim 1, wherein the gas-covered zone remediation well and the saturated zone remediation well are multifunctional injection wells for injecting nutrients, aerobic biological agents and compressed mixtures of oxygen and matrix gases.
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