Novel contaminated site Hg in-situ detoxifying method based on biogas residues

A site and biogas residue technology, applied in the field of new treatment of Hg-contaminated soil, can solve the problems of long reaction cycle, secondary pollution, high cost, etc., and achieve the effect of easy large-scale reproduction, strong natural tolerance, and long-lasting and effective fixation

Inactive Publication Date: 2016-09-14
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

[0015] (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 SO Record) / organic carbon mass ratio is 0.07: 1, and the mixed solution reacts 3 days, obtains Hg soil remediation medicament;

[0016] (2) The restoration agent in the step (1) is pressurized injected into the Hg-containing soil through the injection well, and the control pressure is in the range of 0.2-0.5Mpa. If it exceeds, the injection is stopped, and the injection dose of the site per square meter per day is 1-2 on average. 5 cubic meters, the first 2 injections were separated by 3 days; then injected once every 10 days, the injection agent was changed to carbon source and sulfate mixed solution, and the mass ratio of sulfate (in SO4) / organic carbon in the mixed solution was 0.1: 1; after 6 consecutive injections, ...

Embodiment 2

[0019] (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 10-20%, the solid content is 10-25%, the organic carbon content is 10-25%, and the sulfate (in SO Record) / the mass ratio of organic carbon is 0.1: 1, and the solution reaction after mixing is 3 days, obtains Hg soil remediation medicament;

[0020] (2) The restoration agent in the step (1) is pressurized injected into the Hg-containing soil through the injection well, and the control pressure is in the range of 0.2-0.5Mpa. If it exceeds, the injection is stopped, and the injection dose of the site per square meter per day is 1-2 on average. 5 cubic meters, the first 2 injections are separated by 3 days, and then injected every 10 days. After 5 consecutive injections, the injection is stopped;

[0021] (3) During the repair period, the water is replenished by spraying water on the surface every 2-5 days, so that th...

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PUM

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Abstract

The invention discloses a novel contaminated site Hg in-situ detoxifying method based on biogas residues. The biogas residues, a carbon source and sulfate are prepared into an agent to be injected into Hg-containing soil in situ, then, a special construction and maintenance manner is adopted, fixed ecological fungicide gradually seeps into the ground, and the deep layer contaminated soil Hg is fixed. According to the method, the Hg-containing site with the high pollution depth can be repaired with the low cost and high efficiency, meanwhile, waste is treated through waste, and the biogas residues are treated.

Description

technical field [0001] The invention provides a new method for treating Hg-contaminated soil, which is mainly aimed at the soil with high Hg-polluted depth. Biogas residues, carbon sources and sulfates are formulated into medicaments and injected into the Hg-containing soil in situ, and then special The maintenance method can efficiently fix Hg while saving costs, and 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 Hg-containing 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 so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/08
CPCB09C1/105B09C1/08B09C2101/00
Inventor 张大磊李健孙箫赵昱皓
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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