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A detoxification method for in-situ and ex-situ coupling of hg in heavily polluted sites

A heavy-pollution, field-based technology, applied in the field of new treatment of Hg-contaminated soil, can solve the problems of soil secondary pollution, high energy consumption, secondary pollution, etc.

Active Publication Date: 2020-10-23
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, 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 SO4 / The mass ratio of organic carbon is 0.7: 1, and the mixed solution is reacted for 2 days to obtain Hg soil remediation agent;

[0019] (2) Excavate 10m of soil on the surface of the Hg-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;

[0020] (3) The soil in step (2) is crushed to below 5 mm, then mixed with the medicament described in step (1), the mixing ratio is 1:0.5 for the mass ratio of Hg-containing soil to medicament, 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 the initial 20 days,...

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 SO4 / The mass ratio of organic carbon is 0.5: 1, and the mixed solution is reacted for 1 day to obtain Hg soil remediation agent;

[0024] (2) Excavate 5m of the surface layer soil containing Hg, 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 5 mm, then mixed with the medicament described in step (1), the mixing ratio is 1:0.5 for the mass ratio of Hg-containing soil to medicament, 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 the initial 20 days, so that the b...

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PUM

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Abstract

The present invention adopts a detoxification method of in-situ and ex-situ coupling of Hg in heavily polluted sites. Sludge, carbon sources and sulfates are prepared into medicaments and applied to Hg-containing soils, and then special construction and maintenance methods are adopted to make the reduction of ecological bacteria The agent gradually penetrates into the ground and restores the Hg in the deep polluted soil. This method can remediate Hg-containing sites with high pollution depth at low cost and high efficiency, and at the same time treat waste with waste, and treat sludge.

Description

technical field [0001] The present invention provides a new method for treating Hg-contaminated soil. Sludge, carbon sources and sulfates are formulated into medicaments and applied to Hg-containing soils, and then a special maintenance method is adopted to efficiently reduce Hg while avoiding sulfates. 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 Hg. Current methods for treating antimony-bearing soils have drawbacks. 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 contain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/10C09K17/40
CPCB09C1/08B09C1/105B09C2101/00C09K17/40
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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