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Thermal strengthening assisted in-situ chemical oxidation method for remediating organic contaminated soil

An in-situ chemical oxidation and organic pollution technology, applied in the field of organic polluted soil treatment, can solve problems such as high repair cost and constraints, and achieve the effects of high repair efficiency, heat saving, and increased diffusion radius.

Inactive Publication Date: 2019-07-16
GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for repairing organic polluted soil by thermally enhanced assisted in-situ chemical oxidation. Technical Issues with Environmental Constraints

Method used

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  • Thermal strengthening assisted in-situ chemical oxidation method for remediating organic contaminated soil
  • Thermal strengthening assisted in-situ chemical oxidation method for remediating organic contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment is used to repair the soil polluted by the organochlorine pesticide HCH, and the specific operations are as follows:

[0024] Step (1), remove sundries such as steel bars, gravels, wood, etc. on the surface of the polluted soil, and use a rotary tiller to mix the restoration agent with the contaminated soil with a thickness of 300mm on the surface and then flatten and compact it. The dosage of the restoration agent is polluted 10% of the soil mass, the restoration agent is an aqueous solution of sodium hydroxide and sodium persulfate composition, its mass concentration is 20%, and the dosage of the sodium hydroxide is 2% of the mass of sodium persulfate;

[0025] Step (2), use the GPS locator to arrange points according to the triangle method, and the parameters of the point arrangement ensure that the repair area is completely covered within the diffusion radius of the repair agent;

[0026] Step (3), using a high-pressure rotary jet injection device to...

Embodiment 2

[0032] This embodiment is used to repair the soil polluted by the organochlorine pesticide HCH, and the specific operations are as follows:

[0033] Step (1), remove sundries such as steel bars, gravels, wood, etc. on the surface of the polluted soil, and use a rotary tiller to mix the restoration agent with the contaminated soil with a thickness of 300mm on the surface and then flatten and compact it. The dosage of the restoration agent is polluted 4% of the soil quality, the restoration agent is an aqueous solution of sodium hydroxide and sodium persulfate composition, and its mass concentration is 20%, and the dosage of the sodium hydroxide is 4% of the quality of sodium persulfate;

[0034] Step (2), use the GPS locator to arrange points according to the triangle method, and the parameters of the point arrangement ensure that the repair area is completely covered within the diffusion radius of the repair agent;

[0035] Step (3), using a high-pressure rotary jet injection ...

Embodiment 3

[0041] This embodiment is used to repair the soil polluted by the organochlorine pesticide HCH, and the specific operations are as follows:

[0042] Step (1), remove sundries such as steel bars, gravels, wood, etc. on the surface of the polluted soil, and use a rotary tiller to mix the restoration agent with the contaminated soil with a thickness of 300mm on the surface and then flatten and compact it. The dosage of the restoration agent is polluted 6% of the soil quality, the restoration agent is an aqueous solution of sodium hydroxide and sodium persulfate composition, and its mass concentration is 20%, and the dosage of the sodium hydroxide is 8% of the quality of sodium persulfate;

[0043] Step (2), use the GPS locator to arrange points according to the triangle method, and the parameters of the point arrangement ensure that the repair area is completely covered within the diffusion radius of the repair agent;

[0044] Step (3), using a high-pressure rotary jet injection ...

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Abstract

The invention discloses a thermal strengthening assisted in-situ chemical oxidation method for remediating organic contaminated soil. The method comprises the following steps: 1) uniformly mixing a remediating agent and the contaminated soil with a thickness of 300 mm of a surface layer by using a rotary tiller, and performing flattening and compacting; 2) arranging points by adopting a GPS locator combined with a triangle method, wherein point arrangement parameters ensure that all remediation areas are covered in a diffusion radius range of the remediating agent; 3) injecting the remediatingagent solution in situ by adopting a high-pressure rotary jetting injection device at arranged point locations; and 4) installing a heating device in each medicine injection hole, heating the contaminated soil to 30-40 DEG C, and maintaining the design temperature until target pollutants and the remediating agent are fully reacted and the concentration of the target pollutants is reduced to a remediation target value or less. The remediating method provided by the invention has the advantages of low costs and a wide application range, and solves the problems of high energy consumption of an in-situ thermal desorption system, and low remediation efficiency, poor effects and limited by a low-temperature environment of a chemical oxidation method in general technologies for remediating organic contaminated soil.

Description

technical field [0001] The invention relates to the technical field of organic polluted soil treatment, in particular to a method for repairing organic polluted soil through thermal strengthening assisted in-situ chemical oxidation. Background technique [0002] In recent years, due to the rapid economic development and the continuous optimization and upgrading of the industrial structure, the chemical industry enterprises with heavy pollution have been relocated from developed cities to remote areas one after another. At the same time, it also poses a safety hazard to the soil ecosystem and human survival. [0003] The commonly used remediation techniques for organically polluted soil are divided into two categories: in-situ remediation and ex-situ remediation. Ex-situ remediation involves excavation, transportation, off-site remediation / disposal or in-situ ex-situ treatment of contaminated soil, which may easily cause leakage and diffusion of pollutants, and the disposal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/06
CPCB09C1/06B09C1/08B09C2101/00
Inventor 宋海农周永信杨崎峰林宏飞赵志勇廖长君黎秋君杨燕媛张德明廖瑾宣
Owner GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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