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Layering remediation method for heavy metal contaminated soil

A technology of contaminated soil and layered restoration, applied in the field of soil restoration, which can solve the problems of low soil restoration efficiency, uncontrollable soil restoration dose, waste of soil restoration agent, etc., to shorten the restoration period, reduce construction difficulty, and save costs Effect

Inactive Publication Date: 2019-10-18
鸿灌环境技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, people need comprehensive treatment by physical means, chemical means and biological means to achieve relatively good treatment effect. However, due to the different components of soil remediation agents, and after adding soil remediation agents, the amount of soil remediation agents cannot be determined. control, resulting in the waste of soil remediation agent, and the efficiency of soil remediation is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A layered restoration method for heavy metal contaminated soil, characterized in that it comprises the following steps:

[0022] a. Carry out geological survey on polluted soil, take samples at different depths to detect the concentration of metal pollutants, and determine the vertical and horizontal heavy metal concentration distribution of polluted soil;

[0023] b. According to the vertical concentration distribution of pollutants, the soil is divided into heavy metal-polluted soil in the upper layer and light metal-polluted soil in the bottom layer, and the dividing line in the middle is determined. The depth of the dividing line between heavily metal-polluted soil and light metal-polluted soil is 1.5m ;

[0024] c. Use machinery to dig out the heavily polluted soil on the upper layer, use screening equipment to remove construction waste and sundries, and transfer the heavily polluted metal soil to the restoration reaction pool. Spinning engineering cloth, adding r...

Embodiment 2

[0028] a. Carry out geological survey on polluted soil, take samples at different depths to detect the concentration of metal pollutants, and determine the vertical and horizontal heavy metal concentration distribution of polluted soil;

[0029] b. According to the vertical concentration distribution of pollutants, the soil is divided into heavy metal-contaminated soil in the upper layer and light metal-contaminated soil in the bottom layer, and the dividing line in the middle is determined. The depth of the dividing line between heavily metal-contaminated soil and light metal-contaminated soil is 2m;

[0030] c. Use machinery to dig out the heavily polluted soil on the upper layer, use screening equipment to remove construction waste and sundries, and transfer the heavily polluted metal soil to the restoration reaction pool. Spinning engineering cloth, adding reducing agent A, said reducing agent A includes the following components: 40 parts of biomass charcoal, 10 parts of pe...

Embodiment 3

[0034] a. Carry out geological survey on polluted soil, take samples at different depths to detect the concentration of metal pollutants, and determine the vertical and horizontal heavy metal concentration distribution of polluted soil;

[0035] b. According to the vertical concentration distribution of pollutants, the soil is divided into heavy metal-contaminated soil in the upper layer and light metal-contaminated soil in the bottom layer, and the dividing line in the middle is determined. The depth of the dividing line between heavy metal-contaminated soil and light metal-contaminated soil is 2.5m ;

[0036] c. Use machinery to dig out the heavily polluted soil on the upper layer, use screening equipment to remove construction waste and sundries, and transfer the heavily polluted metal soil to the restoration reaction pool. Spinning engineering cloth, adding reducing agent A, said reducing agent A includes the following components: 50 parts of biochar, 15 parts of perlite, ...

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Abstract

The invention discloses a layering remediation method for heavy metal contaminated soil. The layering remediation method comprises the following steps: carrying out geological investigation on contaminated soil; dividing the soil into upper-layer metal severely contaminated soil and bottom-layer metal mildly contaminated soil according to the longitudinal concentration distribution of pollutants,and determining a middle boundary line; digging out the upper-layer metal severely contaminated soil by a machine, removing construction waste and sundries through screening equipment, transferring the metal severely contaminated soil into a remediation reaction tank, adding a reducing agent A according to a ratio to remediate the upper-layer metal severely contaminated soil, applying a reducing agent B on the surface of the metal mildly contaminated soil, uniformly mixing the contaminated soil 20-25cm below the surface layer of the contaminated soil with the reducing agent B through plowing,and carrying out reacting for 8-20 days; and periodically detecting the concentration change of metal pollutants until the detected concentration is lower than a restoration target concentration. Thelayering remediation method for the heavy metal contaminated soil is good in remediation effect, and cost is greatly saved.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a layered remediation method for heavy metal polluted soil. Background technique [0002] Soil heavy metal pollution refers to the excess of various heavy metal elements in the soil, exceeding the limit value that the soil can bear. Excessive heavy metals have a great impact on the self-circulation capacity of the soil. According to statistics, the current area of ​​polluted soil in my country has reached 50 million mu. The heavy metal elements in the soil mainly include mercury, cadmium, lead, chromium, zinc, copper and other elements. In recent years, the content of heavy metal elements in the soil has gradually increased. the trend of. [0003] Soil pollution is different from other environmental pollution in that it has a certain degree of concealment, while air pollution and water pollution are very obvious, and once pollution occurs, it will immediately manifest it...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/10C09K17/40
CPCB09C1/08B09C1/10B09C1/105B09C2101/00C09K17/40
Inventor 姚清
Owner 鸿灌环境技术有限公司
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