Contaminated soil repair method and repair device

A technology for polluted soil and a remediation method is applied in the field of volatile organic compounds and heavy metal cadmium composite polluted soil remediation methods and remediation devices, which can solve the problems of low remediation efficiency, long treatment period and high treatment cost, and achieves the effect of low cost

Pending Publication Date: 2019-03-26
SHANGHAI ONEDEAR ENVIRONMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In general, there are problems such as low repair efficiency, in

Method used

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  • Contaminated soil repair method and repair device
  • Contaminated soil repair method and repair device
  • Contaminated soil repair method and repair device

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0099] Example one

[0100] In an embodiment of the present invention, the soil of the contaminated plot is excavated, and 50 kg of halogenated hydrocarbon and cadmium compound contaminated soil are taken, and the PH value, halogenated hydrocarbon content and total cadmium content are tested; processed by crusher + screening machine Then put the soil particles into a closed reactor, vacuum, keep the internal pressure of the reactor at 18kpa, heat through an external device, and control the internal temperature of the reactor at 145℃, and the treatment time is 15min , The volatile halogenated hydrocarbons in the soil can be removed. Then the hydrochloric acid concentration is 3mol / L, the ethylenediaminetetraacetic acid (EDTA) concentration is 0.04mol / L; the ratio of hydrochloric acid: EDTA=1.5:1 is configured into a mixed aqueous solution; the configured hydrochloric acid is prepared according to the ratio of 0.85L / kg The mixed aqueous solution of EDTA and EDTA circulates the soi...

Example Embodiment

[0101] Example two

[0102] In an embodiment of the present invention, the soil of the contaminated plot is excavated, and 100kg of the halogenated hydrocarbon and cadmium compound contaminated soil is taken, and the PH value, the content of halogenated hydrocarbon and the total cadmium content are detected; processed by crusher + screening machine Then put the soil particles into a closed reactor, vacuum, keep the internal pressure of the reactor at 18kpa, heat by an external device, and control the internal temperature of the reactor at 155℃, and the treatment time is 20min , The volatile halogenated hydrocarbons in the soil can be removed. Then the hydrochloric acid concentration is 3mol / L, the ethylenediaminetetraacetic acid (EDTA) concentration is 0.04mol / L; the ratio of hydrochloric acid: EDTA=1.5:1 is configured into a mixed aqueous solution; the configured hydrochloric acid is prepared according to the ratio of 0.85L / kg The mixed aqueous solution of EDTA and EDTA circula...

Example Embodiment

[0105] Example three

[0106] In an embodiment of the present invention, the soil of the contaminated plot is excavated, and 50 kg of halogenated hydrocarbon and cadmium compound contaminated soil are taken, and the PH value, halogenated hydrocarbon content and total cadmium content are tested; processed by crusher + screening machine Then put the soil particles into a closed reactor, vacuum, keep the internal pressure of the reactor at 18kpa, heat through an external device, and control the internal temperature of the reactor at 165℃, and the treatment time is 15min , The volatile halogenated hydrocarbons in the soil can be removed. Then the hydrochloric acid concentration is 3mol / L, the ethylenediaminetetraacetic acid (EDTA) concentration is 0.04mol / L; the ratio of hydrochloric acid: EDTA=1.5:1 is configured into a mixed aqueous solution; the configured hydrochloric acid is prepared according to the ratio of 0.85L / kg The mixed aqueous solution of EDTA and EDTA circulates the s...

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Abstract

The invention discloses a contaminated soil repair method and a repair device. The repair method comprises the steps of (S1) vacuum thermal separation: performing thermal separation on soil in a vacuum environment so as to separate hazardous substances, and purifying the hazardous substances; (S2) chemical washing: chemically washing the soil on which the vacuum thermal separation is performed; (S3) reduction treatment: adding a reducing agent to the soil on which the chemical washing is performed; (S4) repair: applying a soil repair agent to the soil on which the reduction treatment is performed; (S5) stabilizing treatment: applying a heavy metal cadmium stabilizer and a microbial agent to the repaired soil; and (S6) improvement and maintenance: improving and maintaining the stabilized soil. According to the contaminated soil repair method, the contaminated soil can be thoroughly repaired once with low cost and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of soil pollution remediation, and relates to a method for remediating polluted soil, in particular to a remediation method and a remediation device for compound polluted soil composed of volatile organic compounds and heavy metal cadmium. Background technique [0002] At present, about 200 million mu of cultivated land in China has food safety and ecological safety problems, and nearly 30% of the land has been moderately or severely polluted by heavy metals. Among them, some areas in Liaoning, Hunan, Zhejiang, Jiangxi, Sichuan, Guizhou, Guangdong, Guangxi and other provinces have heavy metal pollution problems to varying degrees, and most of the soils have compound pollution of volatile organic compounds and cadmium, and most of them are polluted by cadmium. Mainly factories and mines. Exhaust gas, waste water, waste residues, vehicle exhaust emissions from industrial and mining enterprises, sludge from se...

Claims

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Application Information

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IPC IPC(8): B09C1/02B09C1/06B09C1/08B09C1/10
CPCB09C1/02B09C1/005B09C1/06B09C1/08B09C1/10
Inventor 朱明扬肖文发
Owner SHANGHAI ONEDEAR ENVIRONMENT TECH
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