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In-situ remediation method for petroleum-contaminated soil

A technology for in-situ remediation and oil pollution. It is applied in the restoration of polluted soil and other directions. It can solve the problems of contaminated soil, soil compaction, and in-situ remediation that cannot be involved, and achieve the effect of easy acquisition and easy degradation.

Inactive Publication Date: 2017-05-31
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction period of this method is more than 40 days, and after the surfactant is added, the soil will be seriously polluted, and the degradation process will easily cause soil compaction
In addition, most of the remediation of related soils is limited to ex-situ remediation, and has no involvement in in-situ remediation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Crush the straw and mix it with the biogas residue. The mixing ratio is 1:1, and at the same time add 1% of the biogas residue KNO 3 , maintain the moisture content of the mixture at 200%, react for 20 days, and prepare biogas residue bacterial agent;

[0016] (2) Mix biogas residue bacteria agent with alcohol solution, the mixing ratio is 1:5, pressurize the mixed solution into the soil through the injection well, the injection pressure is 0.1-1Mpa, the injection volume of the mixed solution and the soil ratio are 3:10 ;

[0017] (3) After an interval of 1-20 days, extract the groundwater, pressurize the groundwater into the soil through the injection well, the injection pressure is 0-1Mpa, and monitor the COD and oil content of the groundwater;

[0018] (4) After repeating step (3) 5 times, no oil was detected in the groundwater, COD<50mg / L, the soil remediation was completed, and the oil in the soil was reduced from 2000mg / kg to below 5mg / kg.

Embodiment 2

[0020] (1) Crush the straw and mix it with biogas residue. The mixing ratio is 3:1 by mass of straw: biogas residue. At the same time, add KNO which accounts for 5% of the mass of biogas residue. 3 , maintain the moisture content of the mixture at 60%, react for 20 days, and prepare biogas residue bacterial agent;

[0021] (2) Mix biogas residue bacteria agent with alcohol solution, the mixing ratio is 1:5, pressurize the mixed solution into the soil through the injection well, the injection pressure is 0.1-1Mpa, the ratio of mixed solution injection to soil is 9:10 ;

[0022] (3) After an interval of 1-20 days, extract the groundwater, pressurize the groundwater into the soil through the injection well, the injection pressure is 0-1Mpa, and monitor the COD and oil content of the groundwater;

[0023] (4) After repeating step (3) 3 times, no petroleum was detected in the groundwater, COD<50mg / L, the soil remediation was completed, and the petroleum in the soil was reduced fro...

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Abstract

The invention provides a novel in-situ treatment method for petroleum-contaminated soil. The thought of the method is that firstly, a biogas residue fungicide with the relatively strong hydrolytic acidification function is cultivated and is injected into the contaminated soil, and meanwhile, alcohol is used for dissolving petroleum in the soil; and microorganisms in biogas residues use the alcohol as a carbon source so that decomposition and conversion of the petroleum in the solution can be more effectively realized, and meanwhile, the alcohol is added so that the bioavailability of the petroleum in the soil can be improved.

Description

technical field [0001] The invention provides a new method for in-situ treatment of petroleum-contaminated soil. The idea is to first cultivate a biogas residue bacterial agent with a strong hydrolysis and acidification function. Microorganisms use alcohol as a carbon source to more effectively decompose and transform petroleum in solution, and the addition of alcohol also improves the bioavailability of petroleum in soil. The method is a method for ecological restoration of petroleum soil and belongs to the field of environmental protection. Background technique [0002] With the development of industry and agriculture and the expansion of urbanization, a large amount of soil has been polluted by oil. At present, there are mainly thermal analysis methods and advanced oxidation methods for petroleum treatment. Thermal analysis methods are costly and easy to generate air pollution. The advanced oxidation method adds a lot of chemicals, which is easy to pollute the soil. At...

Claims

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Application Information

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IPC IPC(8): B09C1/10
CPCB09C1/10B09C2101/00
Inventor 张大磊罗文涛袁宪正
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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