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A CD in-situ and ex-situ coupling detoxification method in heavily polluted sites

A heavy pollution, site technology, applied in the restoration of polluted soil, etc., can solve the problems of secondary pollution, high cost, high energy consumption, etc., and achieve the effect of strong natural tolerance, long-lasting and effective fixation, and cost reduction

Active Publication Date: 2021-04-27
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high temperature melting method is costly and consumes a lot of energy
The biological method has a long reaction cycle and is likely to cause secondary pollution by foreign biological agents
The effect of the curing method is unstable, and the curing agent is likely to cause secondary pollution to the soil
Patent No. 201510056406.6 introduces a solidification method for soil containing heavy metals, but this method uses a large amount of materials, and the cost is high. On the other hand, the solidification effect is unstable. For example, the added calcium oxide is prone to carbonation under natural conditions. Reduces the effect of alkaline curing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Mix sodium sulfate, sludge or carbon source solution according to a certain ratio, so that the dry sludge content of the mixed solution is 0.1-5%, the solid content is 0.5-5%, the organic carbon content is 0.5-5%, and the sulfate (in SO4 record) / organic carbon mass ratio is 0.7: 1, and the solution reaction after mixing is 2 days, obtains Cd soil remediation agent;

[0019] (2) Excavate 10m of soil on the surface of the Cd-containing site, then lay a geomembrane with mesh at the bottom of the excavated site, and lay anti-seepage materials around the excavated site to build a semi-closed storage yard;

[0020] (3) The soil in step (2) is crushed to below 5mm, then mixed with the medicament described in step (1), the mixing ratio is that the mass ratio of Cd-containing soil to medicament is 1:0.5, and then placed in step (2) Closed storage in the semi-enclosed yard;

[0021] (4) During the stockpiling period, keep the soil moisture content in the range of 5-60% in th...

Embodiment 2

[0023] (1) Mix sodium sulfate, sludge or carbon source solution according to a certain ratio, so that the dry sludge content of the mixed solution is 5-15%, the solid content is 5-15%, the organic carbon content is 5-15%, and the sulfate (in SO4 record) / organic carbon mass ratio is 0.5: 1, and the mixed solution is reacted for 1 day to obtain the Cd soil remediation agent;

[0024] (2) Excavate the 5m soil of the surface layer of the Cd-containing site, then lay a geomembrane with mesh at the bottom of the excavated site, and lay anti-seepage materials around the excavated site to build a semi-closed storage yard;

[0025] (3) The soil in step (2) is crushed to below 5mm, then mixed with the medicament described in step (1), the mixing ratio is that the mass ratio of Cd-containing soil to medicament is 1:0.5, and then placed in step (2) Closed storage in the semi-enclosed yard;

[0026] (4) During the stockpiling period, keep the soil moisture content in the range of 5-60% in...

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Abstract

The invention adopts an in-situ and ex-situ coupling detoxification method for Cd in a heavily polluted site, prepares sludge, carbon source and sulfate into medicaments and applies them to Cd-containing soil, and then adopts special construction and maintenance methods to restore ecological bacteria. The agent gradually penetrates into the ground and reduces the Cd in the deep contaminated soil. This method can remediate the Cd-containing sites with high pollution depth at low cost and high efficiency, and treat the sludge with waste treatment at the same time.

Description

technical field [0001] The present invention provides a new method for treating Cd-contaminated soil. Sludge, carbon sources and sulfates are formulated into medicaments and applied to Cd-containing soils, and then a special maintenance method is adopted to efficiently reduce Cd while avoiding sulfates. Secondary pollution, which belongs to the field of environmental protection. Background technique [0002] Due to the random discharge of mining and metallurgical wastewater, a large amount of soil has been polluted by Cd. Current methods for treating cadmium-containing soils are flawed. The high temperature melting method is costly and consumes a lot of energy. The biological method has a long reaction cycle and is likely to cause secondary pollution by foreign biological agents. The effect of the curing method is unstable, and the curing agent is likely to cause secondary pollution to the soil. Patent No. 201510056406.6 introduces a solidification method for soil contai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/10B09C1/08
CPCB09C1/08B09C1/10B09C2101/00
Inventor 张大磊李瑞栋王欣玉
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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