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A method for in situ remediation of soil heavy metal pollution

An in-situ remediation and heavy metal technology, which is applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc., can solve the problems that farmland treatment has not been widely used, and achieve rapid and low-cost in-situ clean soil, high performance The effect of stability and avoiding secondary pollution

Active Publication Date: 2022-04-15
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its low cost, good effect, and fast speed, it has been widely used in developed countries such as the Netherlands, Germany, Sweden, Norway, Belgium, Canada, and the United States, but it has not been widely used in farmland management.

Method used

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  • A method for in situ remediation of soil heavy metal pollution
  • A method for in situ remediation of soil heavy metal pollution
  • A method for in situ remediation of soil heavy metal pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: a kind of method for remediating soil heavy metal pollution in situ, comprises the steps:

[0029] (1) Soaking: 0.05mol·L -1 The citric acid solution is poured into the cultivation layer of the heavy metal polluted soil, wherein the mass volume ratio of the soil to the citric acid solution is 1g:2mL, and the heavy metals are fully dissolved;

[0030] (2) Adsorption: Add modified hair containing at least part of mercapto groups to the soil, wherein the mass volume ratio of citric acid solution, soil and modified hair is 250mL:125g:1g, and stir intermittently to fully absorb heavy metals.

Embodiment 2

[0031] Embodiment 2: a kind of method for remediating soil heavy metal pollution in situ, comprises the steps:

[0032] (1) Soaking: 0.1mol·L -1 The citric acid solution is poured into the cultivation layer of the heavy metal polluted soil, wherein the mass volume ratio of the soil to the citric acid solution is 1g:2mL, and the heavy metals are fully dissolved;

[0033] (2) Adsorption: Collect the supernatant in step (1), and then add modified hair containing at least part of mercapto groups, wherein the mass volume ratio of citric acid solution, soil and modified hair is 250mL:125g:8g, intermittently Stir to fully absorb heavy metals. Then put the clear liquid back to the field.

Embodiment 3

[0034] Embodiment 3: a kind of method of remediating soil heavy metal pollution in situ, comprises the steps:

[0035] (1) Soaking: 0.08mol·L -1 The citric acid solution is poured into the cultivation layer of the heavy metal polluted soil, wherein the mass volume ratio of the soil to the citric acid solution is 1g:2mL, and the heavy metals are fully dissolved;

[0036] (2) Adsorption: Add modified hair containing at least part of mercapto groups to the soil, wherein the mass volume ratio of citric acid solution, soil and modified hair is 250mL:125g:5g, stirring intermittently to fully absorb heavy metals.

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Abstract

The invention provides a method for in-situ restoration of soil heavy metal pollution, comprising the following steps: (1) soaking: pouring a heavy metal dissolution agent into the heavy metal-contaminated soil to dissolve heavy metals; (2) adsorption: adding at least part of the Mercapto-modified hair, intermittent stirring, adsorption of heavy metals. In the method for in-situ remediation of soil heavy metal pollution in the present invention, a joint soil purification technology of lead adsorption material and soil cleaning method is invented, which can realize rapid and low-cost in-situ soil purification, and effectively avoid secondary pollution of the soil, ensuring Soil safety, food safety and ecological environment safety.

Description

technical field [0001] The invention belongs to the technical field of soil pollution prevention and control, and in particular relates to a method for in-situ remediation of soil heavy metal pollution. Background technique [0002] At present, there are many physical, chemical and biological methods to control soil pollution in the world. Physical method is an engineering measure to control soil heavy metal pollution by physical (mechanical) and physical and chemical methods. Mainly include guest soil, topsoil removal, plowing, isolation, soil washing, thermal desorption, electric restoration, vitrification, etc. These methods are effective but costly. Biological measures refer to the use of certain animals, plants or microorganisms to remove or degrade pollutants in the soil. Bioremediation is widely welcomed by the scientific community and government departments because of its low cost, good effect, environmental friendliness, and convenient operation. But the biologic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/02B09C1/00C09K17/32
CPCB09C1/08B09C1/02B09C1/00C09K17/32B09C2101/00
Inventor 张晓霞余炜敏王荣萍梁嘉伟廖新荣
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI