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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

AI Technical Summary

Problems solved by technology

In general, there are problems such as low repair efficiency, incomplete removal, long treatment cycle, and high treatment cost.

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

Embodiment 1

[0100]In one embodiment of the present invention, the soil of the polluted plot is dug out, and 50kg of halogenated hydrocarbon and cadmium compound polluted soil is taken, and the pH value, halogenated hydrocarbon content and total cadmium content are detected; into 3-15mm soil particles; then put the soil particles into a closed reactor, vacuumize, keep the internal pressure of the reactor at 18kpa, heat through an external device, control the internal temperature of the reactor at 145°C, and process for 15 minutes , the volatile halogenated hydrocarbons in the soil can be removed. Then the concentration of hydrochloric acid is 3mol / L, and the concentration of ethylenediaminetetraacetic acid (EDTA) is 0.04mol / L; hydrochloric acid: EDTA=1.5:1 ratio is configured into a mixed aqueous solution; The mixed aqueous solution of EDTA is used for circular washing of the soil after vacuum thermal separation for 15 minutes, and the washing liquid is collected and then subjected to redu...

Embodiment 2

[0102] In one embodiment of the present invention, the soil of the polluted plot is dug out, and 100kg of halogenated hydrocarbon and cadmium composite polluted soil is taken to detect the pH value, halogenated hydrocarbon content and total cadmium content; into 3-15mm soil particles; then put the soil particles into a closed reactor, vacuumize, keep the internal pressure of the reactor at 18kpa, and heat through an external device to control the internal temperature of the reactor at 155°C, and the processing time is 20min , the volatile halogenated hydrocarbons in the soil can be removed. Then the concentration of hydrochloric acid is 3mol / L, and the concentration of ethylenediaminetetraacetic acid (EDTA) is 0.04mol / L; hydrochloric acid: EDTA=1.5:1 ratio is configured into a mixed aqueous solution; The mixed aqueous solution of EDTA and EDTA is used for circular washing of the soil after vacuum thermal separation for 25 minutes, and the washing liquid is collected and then s...

Embodiment 3

[0106] In one embodiment of the present invention, the soil of the polluted plot is dug out, and 50kg of halogenated hydrocarbon and cadmium compound polluted soil is taken, and the pH value, halogenated hydrocarbon content and total cadmium content are detected; into 3 ~ 15mm soil particles; then put the soil particles into a closed reactor, vacuumize, keep the internal pressure of the reactor at 18kpa, heat through an external device, control the internal temperature of the reactor at 165°C, and process for 15 minutes , the volatile halogenated hydrocarbons in the soil can be removed. Then the concentration of hydrochloric acid is 3mol / L, and the concentration of ethylenediaminetetraacetic acid (EDTA) is 0.04mol / L; hydrochloric acid: EDTA=1.5:1 ratio is configured into a mixed aqueous solution; The mixed aqueous solution of EDTA is used to circulate and wash the soil after vacuum thermal separation for 20 minutes, and the washing liquid is collected and then subjected to red...

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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
CPCB09C1/005B09C1/02B09C1/06B09C1/08B09C1/10
Inventor 朱明扬肖文发
Owner SHANGHAI ONEDEAR ENVIRONMENT TECH
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