An in-situ and ex-situ coupling detoxification method for CD in heavily polluted sites based on biogas residues

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

Active Publication Date: 2021-01-05
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

[0017] (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 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;

[0018] (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;

[0019] (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;

[0020] (4) During the stockpiling period, keep the soil moisture content in the rang...

Embodiment 2

[0022] (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 sulfate (in SO4 record) / organic carbon mass ratio is 0.5: 1, and the solution reaction after mixing is 1 day, obtains Cd soil remediation agent;

[0023] (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;

[0024] (3) The soil in step (2) is crushed to below 5mm, then mixed with the agent described in step (1), the mixing ratio is that the mass ratio of Cd-containing soil to agent is 1:0.5, and then placed in step (2) Closed storage in the semi-enclosed yard;

[0025] (4) During the stockpiling period, keep the soil water content in the range of 5-60% ...

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PUM

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Abstract

The present invention adopts an in-situ and ex-situ coupling detoxification method of Cd in heavily polluted sites based on biogas residues. Biogas residues, carbon sources, and sulfates are prepared into medicaments and applied to Cd-containing soils, and then special construction and maintenance methods are adopted. Make the reducing ecological bacterial agent gradually seep into the ground, and reduce the Cd in the deep polluted soil. This method can remediate Cd-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 Cd-contaminated soil. Biogas residues, carbon sources and sulfates are prepared 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/08B09C1/10
Inventor 张大磊李公伟郝志鹏赵昱皓
Owner 山东环保产业集团有限公司
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