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In-situ chemical oxidation remediation method for soil contaminated by benzene series

An in-situ chemical oxidation and polluted soil technology, which is applied in the field of in-situ chemical oxidation of soil, can solve the problems of high disposal cost, high disposal cost, soil loss of function, etc., to prolong effective reaction time, save restoration input cost, and high The effect of redox potential

Inactive Publication Date: 2021-02-23
NANJING GW ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Soil remediation technology is divided into in-situ remediation and ex-situ remediation according to the location of soil remediation. The disadvantage of in-situ remediation is the disposal of "three wastes" during the remediation process, while the disadvantage of ex-situ remediation is that the disposal cost is high and the soil loses its own functions after disposal.
Soil remediation technology is divided into physical remediation technology, chemical remediation technology, biological remediation technology and phytoremediation technology according to the operating principle. Limited to the type of pollutants, long remediation period

Method used

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  • In-situ chemical oxidation remediation method for soil contaminated by benzene series

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A chemical polluted site, the main pollutants are benzene (11.5mg / kg), toluene (30.5mg / kg), o-xylene (3.2mg / kg), m-xylene (4.7mg / kg), ethylbenzene (1.7mg / kg), pollution depth 8m, pollution area 40000m 2 , the site is open and flat, and the soil layer in the site is mainly silt and silt. By simulating the field conditions to carry out small tests, it is determined that the soil remediation agent combination is a mixed reagent of hydrogen peroxide and ferrous sulfate, and the injection method is tube well injection. The results of the small test show that after multiple cycles of chemical oxidation, the concentration of each pollutant is as follows: benzene (0.4mg / kg), toluene (2.7mg / kg), o-xylene (0.3mg / kg), m-xylene (0.2mg / kg), ethylbenzene (0.1mg / kg).

[0055] To simulate a small test, take 10g of contaminated soil samples in a conical flask, add 50mL of water, and add 30% H to the conical flask respectively. 2 o 2 , 30%H 2 o 2 +FeSO 4 、Na 2 S 2 o 8 For diff...

Embodiment 2

[0061] Material leakage in a chemical plant caused surrounding soil pollution. The main pollutants were benzene (7.3mg / kg), toluene (1.4mg / kg), and styrene (21.5mg / kg). The pollution depth was 6m and the pollution area was 15,000m 2 , the site is densely covered with structures, and the soil layer in the site is mainly silt and silty clay. By simulating field conditions to carry out small tests, it is determined that the soil remediation agent combination is a mixed reagent of hydrogen peroxide, ferrous sulfate, and sodium persulfate, and the injection method adopts a combination of well point injection and jet injection. The results of the small test show that after repeated cycles of chemical oxidation, the concentration of each pollutant is as follows: benzene (0.3mg / kg), toluene (0.4mg / kg), styrene (2.6mg / kg).

[0062] To simulate a small test, take 10g of contaminated soil samples in a conical flask, add 50mL of water, and add 30% H to the conical flask respectively. 2 o...

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Abstract

The invention relates to an in-situ chemical oxidation remediation method for soil contaminated by benzene series. The method comprises the following steps: injecting a soil remediation agent, carrying out ex-situ treatment after extraction and conducting periodic monitoring. After the injected soil remediation agent is in full contact with pollutants adsorbed on soil particles in a contaminated soil layer under the action of underground water runoff, permeation and hydraulic gradient, the pollutants are degraded into low-molecular simple organic matters by utilizing relatively high oxidation-reduction potential of the soil remediation agent, so the in-situ chemical oxidation remediation method for the soil contaminated by benzene series is realized.

Description

technical field [0001] The invention relates to an in-situ chemical oxidation restoration method for soil polluted by benzene series, and belongs to the field of in-situ chemical oxidation methods for soil. Background technique [0002] Benzene series is a general term for benzene and its derivatives. Common benzene series include benzene, toluene, ethylbenzene, o-xylene, m-xylene, p-xylene, and styrene. Benzene series are not only fuel oil components, but also widely used chemical raw materials. Due to the industrial wastewater discharged from petrochemical, pesticide, organic chemical, coking chemical and other industries contains a lot of benzene series, they become organic pollutants in rivers, air and groundwater. important source of pollutants. The benzene series pollution in the soil mainly comes from the discharge of industrial and domestic sewage, the leakage of petroleum and chemical solvents, and the benzene series attached to the atmosphere and particulate matte...

Claims

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Application Information

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IPC IPC(8): B09C1/08C09K17/02
CPCB09C1/08C09K17/02B09C2101/00
Inventor 韩正昌马军军卜旭凌陶志慧朱家明张寿兵周啸
Owner NANJING GW ENVIRONMENT ENG
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