CN111687206A - In-situ enhanced biological ventilation restoration method for petroleum hydrocarbon polluted site - Google Patents
In-situ enhanced biological ventilation restoration method for petroleum hydrocarbon polluted site Download PDFInfo
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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- B09C1/00—Reclamation of contaminated soil
- B09C1/005—Extraction of vapours or gases using vacuum or venting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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Abstract
The invention relates to an in-situ reinforced biological ventilation restoration method for a petroleum hydrocarbon polluted site, which mainly solves the problems of low restoration efficiency, poor restoration effect, high restoration cost and limited application range of in-situ restoration technology in the prior art. The invention adopts an in-situ reinforced biological ventilation restoration method for a petroleum hydrocarbon polluted site, firstly, a hydraulic fracturing technology is utilized to form a soil layer crack and a sand layer in the soil layer around an injection well of the petroleum hydrocarbon polluted site, so as to improve the permeability coefficient of the polluted site, further, air or oxygen, nutrient solution and an external efficient degrading microbial inoculum are supplied to soil and underground water, the degradation of pollutants is promoted by means of aerobic activity of microorganisms, meanwhile, a pressure gradient in the soil is utilized to promote volatile organic compounds and degradation products to flow to an extraction well, and the technical scheme of extraction removal better solves the problems and can be used for restoring the petroleum hydrocarbon polluted site.
Description
Technical Field
The invention relates to an in-situ reinforced biological ventilation restoration method for a petroleum hydrocarbon polluted site, and belongs to the technical field of in-situ restoration of soil and underground water of a petroleum hydrocarbon organic matter polluted site.
Background
The petroleum hydrocarbon leakage in the processes of oil and gas drilling, oil extraction, crude oil gathering and storage, oil refining chemical industry, oil product sale and the like causes soil and underground water pollution. Taking a gas station as an example, a survey in the united states shows that nearly 42 thousand tanks are identified as having leakage problems, and 15 thousand contaminated sites wait for remediation due to leakage problems, and the gas station leakage has been considered as one of the largest sources of contamination of the groundwater in the united states. The field environment investigation is carried out on 242 gas stations in Shaanxi, Shanxi, Hebei, Sichuan, Chongqing, Jiangsu and the like, and the result shows that the number of the detected pollutant gas stations is 116, and the proportion is 47.9%. And 56 of 116 detected pollutant gas stations have the pollutant detection exceeding, which accounts for 23.1 percent of the total number of the monitored gas stations, and the average pollutant exceeding multiple is 70 times.
At present, the polluted site restoration technology is numerous and mainly comprises two major categories of in-situ restoration and ex-situ restoration, including soil replacement, normal-temperature desorption, thermal desorption, vapor extraction, multiphase extraction, extraction treatment, chemical leaching, solidification stabilization, chemical oxidation reduction, incineration, natural attenuation monitoring, biological ventilation restoration and the like. In-situ remediation does not need to carry out remote transportation on pollutants, is more economical, has small soil disturbance and light damage, and is suitable for remediation of deep soil and underground water with larger scale. Wherein, the in-situ biological ventilation promotes the degradation of pollutants by supplying air or oxygen, nutrient solution, exogenous high-efficiency degrading bacteria agent and the like to soil and underground water and relying on the aerobic activity of microorganisms; meanwhile, the pressure gradient in the soil is utilized to promote the volatile organic compounds and the degradation products to flow to an extraction well for extraction and removal. According to years of foreign treatment experience, with the continuous maturity of the repair technology, economic and environment-friendly in-situ repair technologies, such as in-situ biological ventilation and the like, will be developed into mainstream in the future. The in-situ biological ventilation technology promotes the degradation of pollutants by supplying air or oxygen, nutrient solution, exogenous high-efficiency degrading bacteria agent and the like to soil and underground water and relying on the aerobic activity of microorganisms; meanwhile, the pressure gradient in the soil is utilized to promote the volatile organic compounds and the degradation products to flow to an extraction well for extraction and removal. The in-situ biological ventilation technology has a good repairing effect on high-permeability organic polluted sites, and when polluted soil such as clay and silty clay with low soil permeability coefficient is repaired, the repairing efficiency is affected due to the fact that air or oxygen transmission is blocked, the repairing effect is poor, and repairing cost is increased.
The key link of the polluted site remediation is to screen and determine the polluted site remediation technology according to comprehensive factors such as pollutant type concentration, remediation period, remediation target value and soil permeability, wherein the soil permeability is the most key index. For high permeability soils, the techniques of choice are numerous. When in-situ remediation is performed on low-permeability soil, such as clay, silty clay and other polluted soil with low soil permeability coefficient, the remediation efficiency is affected due to slow chemical agent transmission rate, poor hydraulic conductivity or small extraction radius, so that the remediation effect is poor, the remediation cost is increased, and the application range of the in-situ remediation technology is greatly limited. Also, in situ bioremediation techniques are greatly limited in their application to low permeability soil and groundwater contaminated sites.
The patent CN104275344A discloses a soil remediation method by a micro-explosion method, which is characterized in that explosives are packaged into explosive bags in advance or non-explosive explosion sources are used and put into a packaging container, and soil remediation agents are filled in the container, after the explosives and the soil remediation agents are packaged, the explosive bags are dispersedly arranged in polluted soil, and explosion shock waves are generated by continuous detonation, so that the soil is loosened and broken in a large range, meanwhile, the soil remediation agents are rapidly diffused into a spherical range taking the explosion sources as centers under the action of the shock waves to form the maximum mixing with the polluted soil, and the in-situ remediation of the soil with the soil permeability coefficient is realized. However, this method requires the installation of the explosive charge in advance, increases the amount of labor, and has problems of safety and secondary contamination.
Patent CN104624623A discloses a contaminated site normal position extraction repair method, forms the sand bed in the soil horizon around the well through the fracturing, repeats this process, forms a plurality of sand beds that are in the not co-altitude of well, increases the infiltration ability of stickness soil for normal position extraction speed to improve and extract the repair effect.
The patent relates to a method for improving the permeability of a polluted site by forming soil layer cracks in a soil layer around an injection well by utilizing a hydraulic fracturing technology, filling a sand layer and further promoting the degradation of pollutants by supplying air or oxygen, nutrient solution, exogenous high-efficiency degrading bacteria agent and the like to soil and underground water and relying on aerobic activity of microorganisms; meanwhile, the pressure gradient in the soil is utilized to promote the volatile organic compounds and the degradation products to flow to an extraction well for extraction and removal.
Disclosure of Invention
The invention aims to solve the technical problems of low restoration efficiency, poor restoration effect, high restoration cost and limited application range of in-situ restoration technology in the prior art, and provides a novel in-situ reinforced biological ventilation restoration method for petroleum hydrocarbon polluted sites, which has the advantages of high restoration efficiency, good restoration effect, low restoration cost and unlimited application range of in-situ restoration technology.
In order to solve the problems, the technical scheme adopted by the invention is as follows: a method for restoring the in-situ reinforced biologic ventilation of the petroleum hydrocarbon polluted site includes such steps as hydraulic fracturing to form soil layer crack and sand layer in the soil layer around the injection well of petroleum hydrocarbon polluted site, supplying air or oxygen, nutritive liquid and efficient degradating bacteria to soil and underground water, and aerobic activity of microbes to promote the degradation of pollutants while using the pressure gradient in soil to make the volatile organic substances and degradating products flow to sucking well for extracting and removing them.
In the above technical solution, preferably, the pollutant is petroleum hydrocarbon organic pollution including but not limited to gasoline, diesel oil, aviation kerosene, and the pollution depth depends on a specific site; the underground water should not contain light non-aqueous phase fluid LNAPL, and the pumping treatment mode is adopted for the polluted underground water containing LNAPL.
In the technical scheme, preferably, the soil type of the polluted site is clay and silty clay with low soil permeability coefficient, the soil permeability coefficient of the clay or the silty clay is improved by utilizing a hydraulic fracturing technology, the fracturing fluid is selected from water-based fracturing fluid, and the building sand with the grain diameter of 7-12 meshes, the gelling agent cellulose less than 5 wt% and the water 20 wt% are formed by 75-80 wt%, and the fracturing fluid components ensure that secondary pollution cannot be caused.
In the above technical solution, preferably, the number of the injection wells is specifically determined according to the area and concentration of the contaminated site, but the influence radius of the injection wells is ensured to cover the contaminated site; the number of extraction wells depends in particular on the area of the site of contamination and on the concentration of contaminants, but ensures that extraction affects each injection well.
In the technical scheme, preferably, a single injection well is taken as a reference, the injection well pipe is a water filter pipe, 3-4 openings are arranged in the water filter pipe in the same circumferential direction, the distance between the openings in the axial direction is 10-20cm, and the openings are strip-shaped openings, so that slurry outlets are uniformly distributed on the side wall of the water filter pipe.
In the technical scheme, preferably, fracturing injection is sequentially carried out from bottom to top according to the pollution distribution depth to form a plurality of sand layers, and the slurry pressing pressure is determined according to the influence radius of hydraulic fracturing design and the soil texture; and after the hydraulic fracturing of the injection well is finished to form a plurality of sand layers, if the underground water and the soil need to be repaired simultaneously, blowing air or oxygen into the underground water in the injection well.
In the above technical solution, preferably, the gas phase extraction is performed in the extraction well while air or oxygen is introduced into the injection well, and the extracted gas phase is disposed on the ground in an activated carbon or catalytic combustion manner.
In the above technical solution, preferably, when the injection well is filled with air or oxygen, if the number of indigenous microorganisms in the soil is less than 105The order of magnitude, or soil pollutants are not suitable for the degradation of indigenous microorganisms, or soil environment conditions are not suitable for the mass growth of indigenous degradation bacteria, exogenous high-efficiency degradation bacteria agents are inoculatedThe source efficient degradation microbial inoculum can efficiently degrade petroleum hydrocarbon, and does not generate intermediate products with toxicity.
In the above technical solution, preferably, the carbon in the soil: nitrogen: the ratio of phosphorus (C: N: P) should be maintained at 100:5-10:1 to satisfy aerobic microorganism growth and propagation and pollutant degradation, and NH should be added if the condition is not satisfied4 +Or PO4 3-(ii) a Adjusting the soil temperature to 20-40 deg.C, and the soil pH to 5-9.
In the above technical solution, preferably, the nutrient solution contains C, N, P nutrient substances and a small amount of trace element nutrient substances, and the specific components and proportions of the nutrient solution are configured according to site conditions; the exogenous high-efficiency degradation microbial inoculum is a mixed microbial inoculum which is screened from polluted soil and can efficiently degrade petroleum hydrocarbon pollutants.
According to the method, a hydraulic fracturing technology is utilized to form a soil layer crack and a sand layer in a soil layer around an injection well, so that the permeability coefficient of a polluted site is improved, and the microbial degradation of pollutants is promoted through an in-situ biological ventilation technology; meanwhile, the pressure gradient in the soil is utilized to promote the volatile organic compounds and the degradation products to flow to the extraction well for extraction and removal, and the method has the advantages of high repair efficiency, good repair effect, low repair cost and unlimited application range of the in-situ repair technology, and obtains better technical effect.
The present invention will be further illustrated by the following examples, but is not limited to these examples.
Detailed Description
Example 1
Taking in-situ biological ventilation and restoration of soil and underground water in a certain gas station as an example.
The service time of the gas station is 24 years, the pollution to the soil and underground water around the oil tank and the oiling machine is serious, wherein the highest concentration of benzene in the soil reaches 25ppm, the highest concentration of methyl tert-butyl ether (MTBE) reaches 980ppm, the highest concentration of MTBE in the underground water reaches 240ppb, the benzene repair target value in the soil is 3.8ppm, the MTBE repair target value is 220ppm, and the MTBE repair target value in the underground water is 12 ppb. The depth of pollution is 8m from the ground to the underground, the depth of a water line is about 4.3m, a field is clay, and the soil permeability coefficient is 8×10-7m/s, the flow speed of underground water is 1 cm/day, the pollution plume reaches 15m downstream of the pollution source, and the widest position reaches 6 m. Indigenous microbial digital 8 x 105In order of magnitude, the ratio of C to N to P is 100:4: 0.7.
The number of the injection wells is 7, the depth of each injection well is 9m, the design influence radius of each injection well is 3m, the number of the extraction wells is 3, the depth of each extraction well is 5m, for each injection well, the water system fracturing fluid consists of 80 wt% of building sand with the grain diameter of 7-12 meshes, 1 wt% of guar gum and 19 wt% of water, an injection well pipe is a water filter pipe, 3 strip-shaped openings are arranged in the same circumference direction of the water filter pipe, the distance between the openings in the axial direction is 15 cm., the slurry pressing pressure is 1.4-1.6MPa, fracturing injection is sequentially carried out from bottom to top from the well bottom to form a plurality of sand layers, the soil permeability coefficient of the area is greatly improved, and the sand layer permeability coefficient is 7 × 10-4m/s, cracks are generated in the soil between the sand layers due to fracturing, and the average permeability coefficient of the soil is improved to 3 × 10-5m/s, the permeability is improved by nearly 40 times, the influence radius is averagely up to 2.9m, and the expected target is met.
After fracturing is finished to form a plurality of sand layers, air is blown into underground water, and the inflating rate of a single well is 8m3H, make up NH4 +Or PO4 3-The ratio of C to N to P is adjusted to 100 to 10 to 1.
And (3) introducing air into the injection well and simultaneously performing gas phase extraction in the extraction well, wherein the extracted gas phase is adsorbed by active carbon on the ground.
After 3 months of continuous remediation, the benzene remediation value in the soil was 5.4ppm, the MTBE remediation value was 380ppm, and the MTBE remediation value in the groundwater was 18 ppb.
After 5 months of continuous remediation, the benzene remediation value in the soil is 2.8ppm, the MTBE remediation value is 200ppm, and the MTBE remediation value in the groundwater is 9ppb, so that the remediation target is met.
Example 2
Taking in-situ biological ventilation restoration of soil and underground water of an oil depot in a certain refinery site as an example.
The oil depot of the refining site has the service life of more than 30 years and is still used at present, and the pollution of the downstream soil and the underground water of the oil depot is serious due to the flowing of the underground water, wherein the highest concentration of benzene in the soil1500ppm, the highest concentration of ethylbenzene is 850ppm, the target value of benzene repair in soil is 5ppm, the target value of ethylbenzene repair is 77ppm, the pollution depth is 4m from the ground to the underground, the water line depth is about 4m, the site is clay, and the soil permeability coefficient is 5 × 10-6m/s, the flow speed of underground water is 0.8cm/d, the pollution plume reaches 45m downstream of the pollution source, and the widest position reaches 20 m. Indigenous microorganism number 3 x 105In order of magnitude, the ratio of C to N to P is 100:2: 0.5.
The number of the injection wells is 15, the depth of each injection well is 5m, the design influence radius of each injection well is 4.5m, the number of the extraction wells is 5, the depth of each extraction well is 5m, for each injection well, the water system fracturing fluid consists of 75 wt% of building sand with the grain diameter of 7-12 meshes, 5 wt% of guar gum and 20 wt% of water, an injection well pipe is a strainer, 3 strip-shaped openings are arranged in the strainer in the same circumference direction, the interval between the openings in the axial direction is 15 cm., the slurry pressing pressure is 1.0-1.4MPa, fracturing injection is sequentially carried out from bottom to top from the bottom of the well to form a plurality of sand layers, the soil permeability coefficient of the area is greatly improved, and the sand layer permeability coefficient is 5 × 10-4m/s, cracks are generated in the soil between the sand layers due to fracturing, and the average permeability coefficient of the soil is improved to 8 × 10-5m/s, the permeability is improved by about 16 times, the influence radius is averagely up to 4.3m, and the expected target is met.
After fracturing is finished to form a plurality of sand layers, air is blown into underground water, and the inflating rate of a single well is 5m3H, simultaneous NH make-up4 +Or PO4 3-The ratio of C to N to P is adjusted to 100 to 5 to 1.
And (3) introducing air into the injection well and simultaneously performing gas phase extraction in the extraction well, wherein the extracted gas phase is adsorbed by active carbon on the ground.
After 2 months of continuous remediation, the benzene remediation value in the soil is 160ppm, and the ethylbenzene remediation value is 320 ppm.
After the continuous remediation for 6 months, the benzene remediation value in the soil is 4.8ppm, the ethylbenzene remediation value is 82ppm, and the remediation target is basically met.
Example 3
Taking in-situ biological ventilation and restoration of soil and underground water in a certain gas station as an example.
The gas stationThe service life is 20 years, the pollution to the soil and underground water around the oil tank and the oiling machine is serious, wherein the highest concentration of benzene in the soil reaches 180ppm, the highest concentration of benzene in the underground water reaches 450ppb, the target value of benzene repair in the soil is 21ppm, the target value of benzene repair in the underground water is 120ppb, the pollution depth is 5m from the ground to the underground, the depth of a water line is about 4m, a field is clay, and the soil permeability coefficient is 7 × 10-6m/s, the flow speed of underground water is 0.4 cm/day, the pollution plume reaches 25m downstream of the pollution source, and the widest position reaches 7 m. The number of indigenous microorganisms is less than 105In order of magnitude, the ratio of C to N to P is 100 to 2 to 1.
The number of injection wells is 12, the depth of each injection well is 6m, the design influence radius of each injection well is 2.6m, the number of extraction wells is 6, the depth is 5m, for each injection well, the water system fracturing fluid consists of 78 wt% of building sand with the grain diameter of 7-12 meshes, 4 wt% of guar gum and 18 wt% of water, an injection well pipe is a strainer, 3 strip-shaped openings are arranged in the strainer in the same circumference, the interval between the openings in the axial direction is 15 cm., the slurry pressing pressure is 1.5-1.9MPa, fracturing injection is sequentially carried out from bottom to top from the bottom of the well to form a plurality of sand layers, the soil permeability coefficient of the area is greatly improved, and the sand layer permeability coefficient is 9 × 10-5m/s, cracks are generated in the soil between the sand layers due to fracturing, and the average permeability coefficient of the soil is improved to 3 × 10-5m/s, the permeability is improved by nearly 13 times, the influence radius is averagely up to 2.8m, and the expected target is met.
After fracturing is finished to form a plurality of sand layers, air is blown into underground water, and the inflating rate of a single well is 7m3H, inoculating mixed bacteria agent which is screened from polluted soil and can efficiently degrade petroleum hydrocarbon pollutants, and supplementing NH4 +Or PO4 3-The ratio of C to N to P is adjusted to 100 to 8 to 1.
And (3) introducing air into the injection well and simultaneously performing gas phase extraction in the extraction well, wherein the extracted gas phase is adsorbed by active carbon on the ground.
After 3 months of continuous remediation, the benzene remediation value in the soil was 58ppm and the benzene remediation value in the groundwater was 210 ppb.
After 5 months of continuous remediation, the benzene remediation value in the soil was 19ppm and the benzene remediation value in the groundwater was 106 ppb.
Example 4
Taking in-situ biological ventilation and restoration of soil and underground water in a certain gas station as an example.
The service time of the gas station is 20 years, the pollution of the soil and the underground water around the oil tank and the oiling machine is serious, wherein the highest concentration of benzene in the soil reaches 180ppm, the highest concentration of benzene in the underground water reaches 450ppb, the target value of benzene repair in the soil is 21ppm, the target value of benzene repair in the underground water is 120ppb, the pollution depth is 5m from the ground to the underground, the depth of a water line is about 4m, a field is clay, and the soil permeability coefficient is 7 × 10-6m/s, the flow speed of underground water is 0.4 cm/day, the pollution plume reaches 25m downstream of the pollution source, and the widest position reaches 7 m. The number of indigenous microorganisms is less than 105In order of magnitude, the ratio of C to N to P is 100 to 2 to 1.
The number of injection wells is 12, the depth of each well is 6m, the number of extraction wells is 6, and the depth is 5 m.
Air is blown into underground water, and the aeration rate of a single well is 7m3H, inoculating mixed bacteria agent which is screened from polluted soil and can efficiently degrade petroleum hydrocarbon pollutants, and supplementing NH4 +Or PO4 3-The ratio of C to N to P is adjusted to 100 to 8 to 1.
And (3) introducing air into the injection well and simultaneously performing gas phase extraction in the extraction well, wherein the extracted gas phase is adsorbed by active carbon on the ground.
After 3 months of continuous remediation, the benzene remediation value in the soil was 125ppm, and the benzene remediation value in the groundwater was 360 ppb.
After 5 months of continuous remediation, the benzene remediation value in the soil was 98ppm and the benzene remediation value in the groundwater was 304 ppb.
Claims (10)
1. A method for restoring the in-situ reinforced biologic ventilation of the petroleum hydrocarbon polluted site includes such steps as hydraulic fracturing to form soil layer crack and sand layer in the soil layer around the injection well of petroleum hydrocarbon polluted site, supplying air or oxygen, nutritive liquid and efficient degradating bacteria to soil and underground water, and aerobic activity of microbes to promote the degradation of pollutants while using the pressure gradient in soil to make the volatile organic substances and degradating products flow to sucking well for extracting and removing them.
2. The in-situ enhanced biological ventilation remediation method for a petroleum hydrocarbon contaminated site as claimed in claim 1, wherein the contaminants are organic contaminants of petroleum hydrocarbon, including but not limited to gasoline, diesel, aviation kerosene, and the depth of contamination is site specific; the underground water should not contain light non-aqueous phase fluid LNAPL, and the pumping treatment mode is adopted for the polluted underground water containing LNAPL.
3. The in-situ enhanced biological ventilation remediation method for the petroleum hydrocarbon contaminated site as claimed in claim 1, wherein the contaminated site soil is of a type of clay or silty clay with a low soil permeability coefficient, the soil permeability coefficient of the clay or silty clay is improved by using a hydraulic fracturing technology, and the fracturing fluid is selected from an aqueous fracturing fluid consisting of 75-80 wt% of building sand with a particle size of 7-12 meshes, < 5 wt% of gelling agent cellulose and 20 wt% of water, and the fracturing fluid components ensure that secondary pollution is not caused.
4. The in-situ enhanced bio-ventilation remediation method for a petroleum hydrocarbon contaminated site as claimed in claim 1, wherein the number of injection wells is specifically determined by the surface area and concentration of the contaminated site, but the injection wells are positioned to influence the radius of the contaminated site to ensure coverage of the contaminated site; the number of extraction wells depends in particular on the area of the site of contamination and on the concentration of contaminants, but ensures that extraction affects each injection well.
5. The in-situ enhanced bio-ventilation restoration method for the petroleum hydrocarbon polluted site as claimed in claim 3, wherein the injection well pipe is a strainer pipe based on a single injection well, 3-4 openings are arranged in the same circumference of the strainer pipe, the distance between the openings in the axial direction is 10-20cm, and the openings are strip-shaped openings, so that slurry outlets are uniformly distributed on the side wall of the strainer pipe.
6. The in-situ enhanced biological ventilation restoration method for the petroleum hydrocarbon polluted site as claimed in claim 1, wherein the fracturing injection is sequentially carried out from bottom to top according to the pollution distribution depth to form a plurality of sand layers, and the slurry pressing pressure is determined according to the hydraulic fracturing design influence radius and the soil texture; and after the hydraulic fracturing of the injection well is finished to form a plurality of sand layers, if the underground water and the soil need to be repaired simultaneously, blowing air or oxygen into the underground water in the injection well.
7. The in-situ enhanced biological ventilation restoration method for the petroleum hydrocarbon polluted site as claimed in claim 6, wherein the injection well is filled with air or oxygen, and simultaneously the extraction well is used for gas phase extraction, and the extracted gas phase is disposed on the ground by activated carbon or catalytic combustion.
8. The in-situ enhanced bio-ventilation remediation method for petroleum hydrocarbon contaminated site as claimed in claim 1, wherein the injection well is filled with air or oxygen, and if the number of indigenous microorganisms in the soil is less than 105The order of magnitude, or soil pollutants are not suitable for the degradation of indigenous microorganisms, or soil environment conditions are not suitable for the mass growth of indigenous degrading bacteria, an exogenous high-efficiency degrading microbial inoculum is required to be inoculated, the exogenous high-efficiency degrading microbial inoculum can efficiently degrade petroleum hydrocarbon, and no toxic intermediate product is generated.
9. The in situ enhanced biological ventilation remediation method of a petroleum hydrocarbon contaminated site as claimed in claim 1, wherein the carbon in the soil: nitrogen: the molar ratio of phosphorus should be maintained at 100:5-10:1 to satisfy the growth and reproduction of aerobic microorganisms and the degradation of pollutants, and if not, NO should be added3 -、NH4 +Or PO4 3-(ii) a Adjusting the soil temperature to 20-40 deg.C, and the soil pH to 5-9.
10. The in-situ enhanced biological ventilation remediation method for the petroleum hydrocarbon contaminated site as claimed in claim 1, wherein the nutrient solution comprises carbon, nitrogen, phosphorus and a small amount of trace element nutrients, and the specific nutrient solution components and proportions thereof are configured according to site conditions; the exogenous high-efficiency degradation microbial inoculum is a mixed microbial inoculum which is screened from polluted soil and can efficiently degrade petroleum hydrocarbon pollutants.
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| CN112872022A (en) * | 2021-03-15 | 2021-06-01 | 中国石油化工股份有限公司 | Method for in-situ remediation of petroleum organic polluted site |
| CN112974494A (en) * | 2021-02-05 | 2021-06-18 | 四川国润和洁环境科技有限公司 | In-situ remediation method for underground water |
| CN112980450A (en) * | 2021-02-05 | 2021-06-18 | 北京沃太斯环保科技发展有限公司 | Activator for in-situ remediation of deep polluted soil microorganisms and application thereof |
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