CN114054496A - Remediation method for VOCs pollution of low-permeability soil body - Google Patents
Remediation method for VOCs pollution of low-permeability soil body Download PDFInfo
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- CN114054496A CN114054496A CN202111182167.0A CN202111182167A CN114054496A CN 114054496 A CN114054496 A CN 114054496A CN 202111182167 A CN202111182167 A CN 202111182167A CN 114054496 A CN114054496 A CN 114054496A
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- 239000002689 soil Substances 0.000 title claims abstract description 85
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000005067 remediation Methods 0.000 title abstract description 13
- 238000005273 aeration Methods 0.000 claims abstract description 74
- 239000004094 surface-active agent Substances 0.000 claims abstract description 21
- 230000000694 effects Effects 0.000 claims abstract description 14
- 230000015556 catabolic process Effects 0.000 claims abstract description 11
- 238000006731 degradation reaction Methods 0.000 claims abstract description 11
- 230000035699 permeability Effects 0.000 claims abstract description 11
- 230000008439 repair process Effects 0.000 claims abstract description 11
- 244000005700 microbiome Species 0.000 claims abstract description 10
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 5
- 239000011734 sodium Substances 0.000 claims abstract description 5
- 238000002347 injection Methods 0.000 claims description 46
- 239000007924 injection Substances 0.000 claims description 46
- 239000007788 liquid Substances 0.000 claims description 22
- 239000000243 solution Substances 0.000 claims description 14
- 241000894006 Bacteria Species 0.000 claims description 13
- 239000007789 gas Substances 0.000 claims description 13
- 238000003795 desorption Methods 0.000 claims description 7
- 238000012258 culturing Methods 0.000 claims description 6
- 239000001963 growth medium Substances 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 230000000593 degrading effect Effects 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 229920006395 saturated elastomer Polymers 0.000 abstract description 3
- 238000009792 diffusion process Methods 0.000 abstract description 2
- ILRSCQWREDREME-UHFFFAOYSA-N dodecanamide Chemical compound CCCCCCCCCCCC(N)=O ILRSCQWREDREME-UHFFFAOYSA-N 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 4
- 239000002957 persistent organic pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003413 degradative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003904 radioactive pollution Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 238000005063 solubilization Methods 0.000 description 1
- 230000007928 solubilization Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 231100001234 toxic pollutant Toxicity 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—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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- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Biotechnology (AREA)
- General Health & Medical Sciences (AREA)
- Microbiology (AREA)
- Molecular Biology (AREA)
- Mycology (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to the technical field of soil remediation, and discloses a remediation method for low-permeability soil VOCs pollution. The surfactant adopted by the invention is N-sodium lauroyl amide, so that the surface tension of a saturated soil body can be reduced, the air intake value of the soil body is reduced, the permeability of gas in the soil body is enhanced, the aeration repair is carried out by adopting a pulse aeration method, the mixing degree of the gas and the polluted soil body is improved, the diffusion and volatilization capacities of VOCs are accelerated, the degradation effect of microorganisms is improved, the effective repair can be carried out on a low-permeability soil VOCs polluted area in an all-around manner, the aeration trailing effect of the low-permeability soil body is solved, and the invention has the advantages of simple operation, economy, effectiveness and environmental friendliness.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a remediation method for VOCs pollution of a hypotonic soil body.
Background
At present, the rapid development of the urbanization process brings good economic benefits on one hand and also brings serious environmental pollution problems such as heavy metal pollution, organic matter pollution, radioactive pollution and the like on the other hand. The pollution problem of volatile organic compounds is particularly prominent, such as petroleum hydrocarbons, organic chlorinated solvents and the like, and the volatile organic compounds become one of toxic pollutants with high risk in urban polluted sites in China. In order to solve this problem, various repair techniques such as a draw-out treatment technique, a heat treatment technique, and the like are currently available. The aeration method technology has the advantages of in-situ operation, environmental friendliness and the like, is widely used for removing volatile organic compounds in high-permeability media (such as sand and the like), and is one of the most effective repair technologies.
However, the actual polluted site has complicated stratum conditions, such as the problem of low-permeability soil pollution, which greatly reduces the remediation effect of the aeration method. On the one hand, the low intrinsic permeability and relative permeability of the soil are caused by the extremely small pores, irregular shapes and extremely poor connectivity among the particles of the low-permeability soil. On the other hand, because of the strong adsorption capacity and the large capillary retardation of the hypotonic soil body, the desorption and dissolution of the pollutants and the bioavailability are greatly reduced. Therefore, the low-permeability polluted soil body has extremely poor aeration repairing effect and obvious trailing effect, which greatly limits the application of the aeration method technology in the low-permeability polluted soil body. In order to solve the problem, the invention provides an operation method integrating surfactant, microorganism and pulse aeration, namely a remediation method for the VOCs pollution of low-permeability soil.
At this stage, the surfactant is a substance that can reduce the interfacial tension of liquid-liquid, solid-liquid, and gas-liquid. When the gas is injected into the saturated polluted soil body during aeration, the surface tension of pore water of the soil body can be reduced, the capillary pressure of gas-water two phases is reduced, and the permeability of the gas in the low-permeability soil body is improved. Therefore, the contact area between the air and the pollutants is greatly increased, and the aeration repair effect is improved. Meanwhile, the surfactant enhances the desorption of the organic pollutants from the soil particles through the solubilization of the surfactant, accelerates the mass transfer of the organic pollutants from the surface of the soil particles to a liquid phase, improves the bioavailability of the organic pollutants, accelerates the degradation rate, and provides a possible path for the biodegradation of the organic pollutants. In addition, the pulse aeration method can greatly enhance the mixing action between gas and soil particles by controlling the aeration action time at intervals, and improve the aeration affected area and gas phase permeability of the low-permeability soil. Therefore, the invention of the surfactant-microorganism-pulse aeration integrated operation method has important engineering practical significance for improving the hypotonic aeration repair effect and expanding the application of the aeration method technology in the hypotonic soil body.
At present, in order to improve the remediation effect of low-permeability VOCs polluted water and soil, the search for a more effective enhanced aeration technology has been widely concerned and deeply researched. Such as: the invention patent application with the publication number of CN109047302A provides an in-situ aeration remediation method for VOCs polluted underground water in a low-permeability zone, which is characterized in that on the basis of surfactant reinforced aeration, a point-position-adjustable hydraulic splitting technology is adopted to perform multi-point hydraulic splitting on the low-permeability polluted zone, a large number of artificial cracks are generated in the zone, and meanwhile, a pressure solution used for splitting is a surfactant solution, so that the gas permeability of the low-permeability polluted zone is enhanced, the desorption capacity of pollutants from fine soil is enhanced, and the problem that the low-permeability polluted zone is difficult to restore is solved. However, this repair method has the following disadvantages:
1) the surfactant solution is sodium dodecyl benzene sulfonate, is a chemical agent and is not easy to naturally decompose. Although the gas-water interfacial tension of the hypotonic soil body can be reduced and the pollutant dissolving effect can be enhanced, secondary pollution of underground water and soil can be caused;
2) the hydraulic fracturing technology is used, and a large number of macroscopic cracks are generated, so that on one hand, the permeability of a low-permeability soil body is enhanced, on the other hand, the mechanical stability of the soil body is influenced, and further, the safety of engineering construction is influenced to a certain extent.
Disclosure of Invention
The present invention has been made to solve the above-mentioned problems occurring in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for repairing the VOCs pollution of low-permeability soil includes such steps as injecting surfactant around the VOCs polluted region of low-permeability soil by multiple injection wells to increase the gas permeability of polluted soil and increase the desorption of VOCs in soil, injecting the degradative bacteria liquid with its advantages, aerating by air pump, mixing gas with low-permeability soil, and increasing the oxygen content of low-permeability soil. Specifically, the method comprises the following steps:
step 1, finding out the depth and range of a VOCs polluted area of a hypotonic soil body by means of geological exploration, and recording the depth of the upper end face of the VOCs polluted area of the hypotonic soil body as h0 and the depth of the lower end face as h 1;
step 2, laying an aeration well system;
the aeration well system comprises an air pump, an air pipeline and an aeration well; the aeration wells are distributed in a regular triangle mode, vertically penetrate through the unsaturated region of the soil body and are inserted into the VOCs polluted region of the low-permeability soil body; the bottom of the aeration well is provided with an aeration port, the depth of the lower end face of the aeration port is recorded as h2, and the depth is equal to or more than 1m and equal to or less than h2-h1 and equal to or less than 3 m;
the injection well system comprises an injection pump, a fluid conduit, and a plurality of injection wells; the multiple injection wells vertically penetrate through unsaturated zones of soil bodies and are uniformly distributed at the VOCs polluted zones of the hypotonic soil bodies, the depth of the bottom of each injection well is recorded as h3, and the depth of h0 is more than or equal to h3 and more than or equal to h 1;
injecting a surfactant into a low-permeability VOCs polluted area through a liquid pipeline and a plurality of injection wells by using an injection pump, and standing for one day after the injection is finished;
step 5.1, culturing microorganisms;
taking 500g of VOCs polluted soil on site, carrying out intermittent culture in a culture medium, replacing the culture medium every 2 days, and culturing for 14 days;
step 5.2, domesticating the microorganisms;
controlling pH value between 7.0-8.0, dissolved oxygen content between 3.0-4.0mg/L, solution temperature at 20 deg.C, and aeration flow rate at 30-60 ml/min; the VOCs solution is used as a unique carbon source, and the concentration of VOCs is gradually increased to be consistent with the concentration of VOCs on site;
step 5.3, injecting the domesticated and cultured indigenous dominant degrading bacteria liquid into a VOCs (volatile organic compounds) polluted area of a hypotonic soil body through a liquid pipeline and a plurality of injection wells by using an injection pump;
step 6, carrying out pulse aeration repair
After the injection of the indigenous dominant degradation bacteria liquid is finished, immediately carrying out pulse aeration; adjusting the air pump to an aeration pressure P, and aerating the air from the aeration port through the air pipeline and the aeration well; the pulse aeration pressure is 500-5000kPa, and the time interval is 120-480 min.
Preferably, the surfactant is a sodium N-lauroyl amino acid solution with the concentration of 2000-3000 mg/L.
Preferably, the distance between the aeration wells is 5-10m, and the distance between the injection wells is 2-5 m.
The invention has the beneficial effects that:
1. the surfactant adopted by the invention is N-sodium lauroyl amide, is an easily degradable and pollution-free anionic surfactant, can reduce the surface tension of a saturated soil body, reduce the air intake value of the soil body, enhance the permeability of gas in the soil body, improve the desorption capacity of VOCs on soil body particles and increase the solubility of the VOCs;
2. the microorganisms adopted by the invention are indigenous dominant degrading bacteria, VOCs in a soil solution can be effectively degraded, and the bioavailability is improved;
3. the invention adopts the pulse aeration method to carry out aeration repair, improves the mixing degree of gas and polluted soil, accelerates the diffusion and volatilization capacities of VOCs, and improves the degradation effect of microorganisms;
4. the remediation method for the VOCs pollution of the low-permeability soil body can comprehensively and effectively remediate the VOCs pollution area of the low-permeability soil body, and solve the aeration tailing effect of the low-permeability soil body;
5. the remediation method for the VOCs pollution of the hypotonic soil body has the advantages of simplicity and convenience in operation, economy, effectiveness and environmental friendliness.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a general schematic of the present invention;
fig. 2 is a schematic diagram of the aeration well distribution of the present invention.
In the figure: the device comprises an air pump 1, a gas pipeline 2, an injection pump 3, a liquid pipeline 4, a plurality of injection wells 5, an aeration well 6 and an aeration port 7.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
referring to fig. 1-2, a remediation method for low-permeability soil VOCs pollution utilizes an injection pump 3, injects a surfactant around a low-permeability soil VOCs polluted area through a plurality of injection wells 5 to improve the gas permeability of the polluted soil and enhance the desorption effect of the polluted VOCs in the soil, then injects cultured indigenous dominant degradation bacteria liquid around the low-permeability soil VOCs polluted area to improve the bioavailability of the polluted VOCs, and finally performs pulse aeration in an aeration well 6 through an air pump 1 to enhance the mixing effect of the gas and the low-permeability soil and improve the oxygen content of the low-permeability soil. Specifically, the method comprises the following steps:
step 1, finding out the depth and range of a VOCs polluted area of a hypotonic soil body by means of geological exploration, and recording the depth of the upper end face of the VOCs polluted area of the hypotonic soil body as h0 and the depth of the lower end face as h 1;
step 2, laying an aeration well system;
the aeration well system comprises an air pump 1, an air pipeline 2 and an aeration well 6; the aeration wells 6 are distributed in a regular triangle manner, vertically penetrate through the unsaturated region of the soil body and are inserted into the VOCs polluted region of the low-permeability soil body; the bottom of the aeration well 6 is provided with an aeration port 7, the depth of the lower end face of the aeration port 7 is recorded as h2, and the requirement that the depth is more than or equal to 1m and less than or equal to h2-h1 and less than or equal to 3m is met;
the injection well system comprises an injection pump 3, a fluid conduit 4 and a plurality of injection wells 5; the multiple injection wells 5 vertically penetrate through unsaturated zones of soil bodies and are uniformly distributed at the VOCs polluted zones of the hypotonic soil bodies, the depth of the bottom of each injection well 5 is recorded as h3, and the depth meets the condition that h0 is not less than h3 is not less than h 1;
injecting a surfactant into a low-permeability VOCs polluted area through a liquid pipeline 4 and a plurality of injection wells 5 by using an injection pump 3, and standing for one day after the injection is finished;
Step 5.1, culturing microorganisms;
taking 500g of VOCs polluted soil on site, carrying out intermittent culture in a culture medium, replacing the culture medium every 2 days, and culturing for 14 days;
step 5.2, domesticating the microorganisms;
controlling pH value between 7.0-8.0, dissolved oxygen content between 3.0-4.0mg/L, solution temperature at 20 deg.C, and aeration flow rate at 30-60 ml/min; the VOCs solution is used as a unique carbon source, and the concentration of VOCs is gradually increased to be consistent with the concentration of VOCs on site;
step 5.3, injecting the domesticated and cultured indigenous dominant degrading bacteria liquid into a VOCs (volatile organic compounds) pollution area of a hypotonic soil body through a liquid pipeline 4 and a plurality of injection wells 5 by using an injection pump 3;
and 6, performing pulse aeration repair.
After the injection of the indigenous dominant degradation bacteria liquid is finished, immediately carrying out pulse aeration; adjusting the air pump 1 to an aeration pressure P, and aerating the air from the aeration port 7 through the air pipeline 2 and the aeration well 6; the pulse aeration pressure is 500-5000kPa, and the time interval is 120-480 min.
Preferably, the surfactant is a sodium N-lauroyl amino acid solution with the concentration of 2000-3000 mg/L.
Preferably, the distance between the aeration wells 6 is 5-10m and the distance between the injection wells 5 is 2-5 m.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. The method for repairing the VOCs pollution of the hypotonic soil is characterized in that a surfactant is injected around a VOCs pollution area of the hypotonic soil through a plurality of injection wells (5) by using an injection pump (3) to improve the gas permeability of the polluted soil and enhance the desorption effect of the VOCs in the soil, then a cultured indigenous dominant degradation bacterium liquid is injected around the VOCs pollution area of the hypotonic soil, and finally pulse aeration is carried out in an aeration well (6) through an air pump (1), and specifically the method comprises the following steps:
step 1, finding out the depth and range of a VOCs polluted area of a hypotonic soil body by means of geological exploration, and recording the depth of the upper end face of the VOCs polluted area of the hypotonic soil body as h0 and the depth of the lower end face as h 1;
step 2, laying an aeration well system;
the aeration well system comprises an air pump (1), an air pipeline (2) and an aeration well (6); the aeration wells (6) are distributed in a regular triangle manner, vertically penetrate through the unsaturated region of the soil body and are inserted into the VOCs polluted region of the low-permeability soil body; the bottom of the aeration well (6) is an aeration opening (7), the depth of the lower end surface of the aeration opening (7) is recorded as h2, and the depth is equal to or more than 1m and equal to or less than h2-h1 and equal to or less than 3 m;
step 3, laying an injection well system;
the injection well system comprises an injection pump (3), a fluid conduit (4) and a plurality of injection wells (5); the multiple injection wells (5) vertically penetrate through unsaturated regions of soil bodies and are uniformly distributed at the VOCs polluted regions of the low-permeability soil bodies, the depth of the bottom of each injection well (5) is recorded as h3, and the requirement that h0 is not less than h3 is not less than h1 is met;
step 4, injecting a surfactant;
injecting a surfactant into a low-permeability VOCs polluted area through a liquid pipeline (4) and a plurality of injection wells (5) by using an injection pump (3), and standing for one day after the injection is finished;
step 5, injecting indigenous dominant degradation bacteria liquid; and it mainly includes the following steps:
step 5.1, culturing microorganisms;
taking 500g of VOCs polluted soil on site, carrying out intermittent culture in a culture medium, replacing the culture medium every 2 days, and culturing for 14 days;
step 5.2, domesticating the microorganisms;
controlling pH value between 7.0-8.0, dissolved oxygen content between 3.0-4.0mg/L, solution temperature at 20 deg.C, and aeration flow rate at 30-60 ml/min; the VOCs solution is used as a unique carbon source, and the concentration of VOCs is gradually increased to be consistent with the concentration of VOCs on site;
step 5.3, injecting the domesticated and cultured aboriginal dominance degrading bacteria liquid into a VOCs polluted area of a hypotonic soil body through a liquid pipeline (4) and a plurality of injection wells (5) by using an injection pump (3);
step 6, performing pulse aeration repair;
after the injection of the indigenous dominant degradation bacteria liquid is finished, immediately carrying out pulse aeration; adjusting the air pump (1) to an aeration pressure P, and aerating the air from the aeration port (7) through the air pipeline (2) and the aeration well (6); the pulse aeration pressure is 500-5000kPa, and the time interval is 120-480 min.
2. The method of claim 1, wherein the surfactant is a sodium N-lauroyl amino acid solution with a concentration of 2000-3000 mg/L.
3. A method for remediating contaminated hypotonic soil mass VOCs as claimed in claim 1, wherein the distance between the aeration wells (6) is 5-10m and the distance between the injection wells (5) is 2-5 m.
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2021
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