Heavily-polluted site Cu in-situ and ex-situ coupling detoxification method based on biogas residues

A heavy pollution, site technology, applied in the restoration of polluted soil, etc., can solve the problems of long reaction period, secondary pollution, high cost, and achieve the effect of easy large-scale reproduction, strong natural tolerance, lasting and effective fixation

Active Publication Date: 2016-09-21
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 proportion, 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 The mass ratio of (in SO ) / organic carbon was 0.7: 1, and the mixed solution reacted for 2 days to obtain Cu soil remediation agents;

[0018] (2) Excavate 10m of soil on the surface layer of the site containing Cu, then lay a geomembrane with mesh at the bottom of the excavated site, and lay anti-seepage materials around the excavation site to build a semi-closed yard;

[0019] (3) Crushing the soil in step (2) to less than 5mm, then mixing with the agent described in step (1), the mixing ratio is that the mass ratio of Cu-containing soil and agent is 1:0.5, and then placed in step (2) The semi-enclosed storage yard is closed for storage;

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

Embodiment 2

[0022] (1) Mix sodium sulfate, biogas residue or carbon source solution according to a certain proportion, 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 content is 5-15%. The mass ratio of (in SO4) / organic carbon is 0.5: 1, and the mixed solution reacts for 1 day to obtain Cu soil remediation agent;

[0023] (2) Excavate 5m of soil on the surface layer of the site containing Cu, then lay a geomembrane with mesh at the bottom of the excavated site, and lay anti-seepage materials around the excavation site to build a semi-closed yard;

[0024] (3) crushing the soil in step (2) to less than 5mm, then mixing with the agent described in step (1), the mixing ratio is that the mass ratio of Cu-containing soil and agent is 1:0.5, and then placed in step (2) The semi-enclosed storage yard is closed for storage;

[0025] (4) During the stockpiling period, keep the soil moisture con...

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PUM

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Abstract

The invention discloses a heavily-polluted site Cu in-situ and ex-situ coupling detoxification method based on biogas residues. The biogas residues, a carbon source and ferrous sulfate are prepared into a medicament to be applied to Cu-containing soil; and then a special construction and curing mode is adopted to enable a reducing ecological microbial agent to gradually permeate underground so as to reduce Cu in deep polluted soil. The method can repair deeply-polluted Cu-containing sites at low cost and with high efficiency, and treats wastes by using wastes to treat the biogas residues.

Description

technical field [0001] The present invention provides a new method for treating Cu-contaminated soil. Biogas residue, carbon source and sulfate are formulated into chemicals and applied to the soil containing Cu, and then a special maintenance method is adopted, which can efficiently fix Cu and avoid sulfates at the same time. The secondary pollution 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 has high cost and high energy consumption. The biological method has a long reaction period and is prone to secondary pollution of foreign biological agents. The effect of the curing method is unstable, and the curing agent is easy to cause secondary pollution to the soil. Patent No. 201510056406.6 introduces a solidification method for soi...

Claims

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Application Information

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Patent Type & Authority Applications(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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