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In-situ enhanced biological ventilation remediation method for petroleum hydrocarbon contaminated site

A biological ventilation and repair method technology, applied in the restoration of contaminated soil, etc., can solve the problems of limited application range, poor repair effect, and low repair efficiency of in-situ repair technology, and achieve the promotion of microbial degradation of pollutants and repair efficiency High and low repair cost

Inactive Publication Date: 2020-09-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the problem of low repair efficiency, poor repair effect, high repair cost, and limited application range of in-situ repair technology in the prior art. It provides a new in-situ enhanced biological ventilation repair for petroleum hydrocarbon contaminated sites method, which has the advantages of high repair efficiency, good repair effect, low repair cost, and unlimited application range of in-situ repair technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take the in-situ bio-ventilation restoration of soil and groundwater in a gas station as an example.

[0023] The gas station has been in use for 24 years, and the soil and groundwater around the oil tanks and fuel dispensers are seriously polluted. The highest concentration of benzene in the soil is 25ppm, the highest concentration of methyl tert-butyl ether MTBE is 980ppm, and the highest concentration of MTBE in groundwater is 240ppb. The benzene remediation target value in soil is 3.8ppm, the MTBE remediation target value is 220ppm, and the MTBE remediation target value in groundwater is 12ppb. The pollution depth is 8m from the ground to the ground, the depth of the water level is about 4.3m, the site is clay, and the soil permeability coefficient is 8×10 -7 m / s, the groundwater flow rate is 1cm / day, the pollution plume reaches 15m downstream of the pollution source, and the widest point reaches 6m. The number of indigenous microorganisms is 8*10 5 Order of magni...

Embodiment 2

[0030] Take the in-situ bio-ventilation restoration of soil and groundwater in an oil depot of a refinery site as an example.

[0031] The oil depot of the refinery site has been used for more than 30 years and is still in use now. Due to the flow of groundwater, the soil and groundwater downstream of the oil depot are seriously polluted. The highest concentration of benzene in the soil is 1500ppm, and the highest concentration of ethylbenzene is 850ppm. The target value of benzene in the soil is 5ppm, the ethylbenzene repair target value is 77ppm. The pollution depth is 4m from the ground to the ground, the depth of the water level is about 4m, the site is clay, and the soil permeability coefficient is 5×10 -6 m / s, the groundwater velocity is 0.8cm / d, the pollution plume reaches 45m downstream of the pollution source, and the widest point reaches 20m. The number of native microorganisms is 3*10 5 Order of magnitude, the ratio of C:N:P is 100:2:0.5.

[0032] The number of i...

Embodiment 3

[0038] Take the in-situ bio-ventilation restoration of soil and groundwater in a gas station as an example.

[0039] The gas station has been in use for 20 years, and the soil and groundwater around the oil tanks and fuel dispensers are seriously polluted. The highest concentration of benzene in the soil is 180ppm, and the highest concentration of benzene in the groundwater is 450ppb. The target value of benzene in the soil is 21ppm. The repair target value is 120ppb. The pollution depth is 5m from the ground to the ground, the depth of the water level is about 4m, the site is clay, and the soil permeability coefficient is 7×10 -6 m / s, the groundwater flow rate is 0.4cm / day, the pollution plume reaches 25m downstream of the pollution source, and the widest point reaches 7m. Native microbes count below 10 5 Order of magnitude, the ratio of C:N:P is 100:2:1.

[0040] The number of injection wells is 12, the depth of each well is 6m, and the design influence radius of each inj...

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Abstract

The invention relates to an in-situ enhanced biological ventilation remediation method for a petroleum hydrocarbon contaminated site. The problems that in the prior art, the remediation efficiency islow, the remediation effect is poor, the remediation cost is high, and the application range of an in-situ remediation technology is limited are mainly solved. By the in-situ enhanced biological ventilation remediation method for a petroleum hydrocarbon contaminated site, firstly, a soil layer crack and a sand layer are formed in a soil layer around an injection hoistway of a petroleum hydrocarboncontaminated site by utilizing a hydraulic fracturing technology to increase the permeability coefficient of the contaminated site, further, air or oxygen, a nutrient solution and an exogenous efficient degrading bacterium agent are supplied into the soil and the underground water, and by means of aerobic activity of microorganisms, pollutant degradation is promoted; meanwhile, volatile organic compounds and degradation products are promoted to flow to a gas extraction well through the pressure gradient in soil. The above problems are well solved through the technical scheme of extraction andremoval, and the method can be used for petroleum hydrocarbon contaminated site remediation.

Description

technical field [0001] The invention relates to an in-situ enhanced biological ventilation restoration method for petroleum hydrocarbon-contaminated sites, and belongs to the technical field of in-situ restoration of soil and groundwater in petroleum hydrocarbon-contaminated sites. Background technique [0002] Petroleum hydrocarbon leakage occurs in the process of oil and gas drilling, oil production, crude oil gathering, transportation and storage, refining and chemical industry, and oil product sales, resulting in soil and groundwater pollution. Taking gas stations as an example, a survey in the United States shows that nearly 420,000 oil tanks have been confirmed to have leakage problems, and 150,000 pollution sites due to leakage problems are waiting for remediation. The United States has regarded gas station leakage as the largest groundwater in the United States. one of the sources of pollution. A total of 242 gas stations in Shaanxi, Shanxi, Hebei, Sichuan, Chongqin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/00
CPCB09C1/10B09C1/00B09C1/005B09C2101/00
Inventor 张树才张宏哲刘政伟房师平张志远郭磊牟桂芹
Owner CHINA PETROLEUM & CHEM CORP
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