A detoxification method based on in-situ and ex-situ coupling of cu in heavily polluted sites based on biogas residues

A heavy pollution and site technology, applied in the restoration of polluted soil and other directions, can solve the problems of secondary pollution, high energy consumption and high cost, and achieve the effect of strong natural tolerance, cost reduction and cost reduction.

Active Publication Date: 2020-11-13
山东环保产业集团有限公司
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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, biogas residue or carbon source solution according to a certain ratio, so that the dry biogas residue 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 SO 4 The mass ratio of / organic carbon is 0.7: 1, and the mixed solution reacts for 2 days to obtain Cu soil remediation agent;

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

[0020] (3) crush the soil in step (2) to less than 5 mm, then mix it with the agent described in step (1), the mixing ratio is 1:0.5 for the mass ratio of Cu-containing soil to agent, and place it 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 the initial 20 ...

Embodiment 2

[0023] (1) Mix sodium sulfate, biogas residue or carbon source solution according to a certain ratio, so that the dry biogas residue content of the mixed solution is 5-15%, the solid content is 5-15%, the organic carbon content is 5-15%, and the SO 4 The mass ratio of / organic carbon is 0.5: 1, and the mixed solution is reacted for 1 day to obtain Cu soil remediation agent;

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

[0025] (3) crush the soil in step (2) to less than 5 mm, then mix it with the agent described in step (1), the mixing ratio is 1:0.5 for the mass ratio of Cu-containing soil to agent, and place it 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 the initial 20 days,...

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PUM

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Abstract

The present invention adopts an in-situ and ex-situ coupling detoxification method of Cu in heavily polluted sites based on biogas residues. Biogas residues, carbon sources, and ferrous sulfate are formulated into medicaments and applied to Cu-containing soils, and then special construction and maintenance methods are adopted. , so that the reducing ecological bacteria agent gradually penetrates into the ground, and restores Cu in the deep polluted soil. This method can remediate Cu-containing sites with high pollution depth at low cost and high efficiency, and at the same time treat waste with waste, and treat the biogas residue.

Description

technical field [0001] The present invention provides a new method for treating Cu-contaminated soil. Biogas slag, carbon source and sulfate are prepared into medicaments and applied to Cu-containing soil, and then a special maintenance method is adopted to efficiently fix Cu while avoiding sulfate. Secondary pollution, which belongs to the field of environmental protection. Background technique [0002] Due to the arbitrary discharge of mining and metallurgical wastewater, a large amount of soil is polluted by Cu. Current methods of treating copper-bearing 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 containing heavy m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/10B09C1/08
CPCB09C1/08B09C1/105B09C2101/00
Inventor 张大磊李瑞栋王欣玉
Owner 山东环保产业集团有限公司
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