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A method for remediation of volatile organic compounds and heavy metal chromium composite polluted soil

A volatile organic compound and compound pollution technology, applied in the field of soil pollution remediation, can solve the problems of low remediation efficiency, high treatment cost, incomplete removal, etc., and achieve the effects of improving physical properties, high reduction performance, and shortening treatment time.

Active Publication Date: 2018-09-18
湖南省和清环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are generally problems such as low restoration efficiency, incomplete removal, long treatment cycle, and high treatment cost.

Method used

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  • A method for remediation of volatile organic compounds and heavy metal chromium composite polluted soil
  • A method for remediation of volatile organic compounds and heavy metal chromium composite polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: Get 10kg of halogenated hydrocarbon and chromium compound polluted soil, carry out pH value, halogenated hydrocarbon content and total chromium content detection; The soil of polluted plot is dug out, is processed into the soil particle of 1-15mm by crusher; Then put the soil particles into a closed reactor, vacuumize to keep the pressure of the reactor at 20kpa, control the temperature of the reactor at 160°C by external heating, and process for 20 minutes, and carry out vacuum thermal separation to remove volatile halogens in the soil Then add solid powder polyacrylamide into the prepared 3% dilute acetic acid solution according to the ratio of 10g / L to form a mixed aqueous solution of acetic acid and polyacrylamide; put the soil after vacuum thermal separation into the water In the washing container, add the mixed aqueous solution of acetic acid and polyacrylamide to the soil in an amount of 1L / kg while stirring, and perform circular leaching for 10 minu...

Embodiment 2

[0024] Embodiment 2: Take 10kg of halogenated hydrocarbon and chromium composite polluted soil, and carry out the detection of pH value, halogenated hydrocarbon content and total chromium content; dig out the soil of the polluted plot, and process it into 1-15mm soil particles by a crusher; Then put the soil particles into a closed reactor, vacuumize to keep the pressure of the reactor at 20kpa, control the temperature of the reactor at 180°C by external heating, and process for 30min, and carry out vacuum thermal separation to remove volatile halogens in the soil Hydrocarbons; then according to the ratio of 10g / L, solid powder polyacrylamide is added to the prepared 3% dilute acetic acid solution to form a mixed aqueous solution of acetic acid and polyacrylamide; the soil after vacuum thermal separation is placed in the rinse In the container, add the mixed aqueous solution of acetic acid and polyacrylamide to the soil in an amount of 1L / kg while stirring, and perform circular...

Embodiment 3

[0025]Embodiment 3: Take 10kg of halogenated hydrocarbon and chromium compound polluted soil, carry out the detection of pH value, halogenated hydrocarbon content and total chromium content; dig out the soil of the polluted plot, and process it into 1-15mm soil particles by crusher; Then put the soil particles into a closed reactor, vacuumize to keep the pressure of the reactor at 20kpa, control the temperature of the reactor at 160°C by external heating, and process for 10 minutes, and carry out vacuum thermal separation to remove volatile halogens in the soil Hydrocarbons; then according to the ratio of 10g / L, solid powder polyacrylamide is added to the prepared 3% dilute acetic acid solution to form a mixed aqueous solution of acetic acid and polyacrylamide; In the washing container, add the mixed aqueous solution of acetic acid and polyacrylamide to the soil in an amount of 1L / kg while stirring, and carry out circular leaching for 20 minutes; collect the eluent for reductio...

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Abstract

The invention relates to a method for repairing volatile organic matter and heavy metal chromium combined polluted soil and belongs to the technical field of soil pollution repairing. The method comprises the following steps: firstly, carrying out vacuum hot separation to remove volatile organic matter, namely halogenated hydrocarbon, in the soil; then sequentially eluting by a chemical eluting agent and carrying out reducing agent treatment and stabilization treatment to carry out heavy metal chromium separation and stabilization; and finally, carrying out improved maintenance treatment on the soil to obtain repaired clean soil. With the adoption of the method, the repairing of the volatile halogenated hydrocarbon and heavy metal chromium combined polluted soil is realized; and a technical process is simple and efficient and no secondary pollution is caused.

Description

Technical field: [0001] The invention relates to the technical field of soil pollution remediation, in particular to a method for composite pollution remediation of volatile organic compounds and heavy metal chromium. technical background: [0002] Soil organic pollution has gradually become the focus of public attention. [0003] Volatile organic compounds—halogenated hydrocarbon pollution is disgusting because of its strong toxicity. Among them, volatile halogenated hydrocarbons (trichloromethane, carbon tetrachloride, trichloroethylene, tetrachloroethylene, 1,2-dichloroethane, etc.) pollute groundwater most commonly. Halogen is a highly toxic group, and halogenated hydrocarbons are generally more toxic than parent hydrocarbons. Many studies have shown that halogenated hydrocarbons have carcinogenic, teratogenic and mutagenic effects on mammals and humans after entering the animal body. After being absorbed through the skin, halogenated hydrocarbons invade the nerve cen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/02B09C1/08B09C1/06
CPCB09C1/02B09C1/06B09C1/08
Inventor 周益辉
Owner 湖南省和清环境科技有限公司
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