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Novel pollution site Cd in-situ detoxification method based on biogas residues

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

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 SO4 record) / organic carbon mass ratio is 0.07: 1, and the solution reaction after mixing is 3 days, obtains Cd soil remediation medicament;

[0016] (2) inject the repair agent in the step (1) into the Cd-containing soil through the injection well under pressure, control the pressure in the range of 0.2-0.5Mpa, stop the injection if it exceeds, and inject the drug dose at 1-0.0000000000000000000000000000000000000 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, stop the injectio...

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 SO4 record) / organic carbon mass ratio is 0.1: 1, and the solution reaction after mixing is 3 days, obtains Cd soil remediation medicament;

[0020] (2) inject the repair agent in the step (1) into the Cd-containing soil through the injection well under pressure, control the pressure in the range of 0.2-0.5Mpa, stop the injection if it exceeds, and inject the drug dose at 1-0.0000000000000000000000000000000000000 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 surface is sprayed with water every 2-5 days for water replenishment, so that the agent can continuously seep to the...

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Abstract

The invention provides a novel pollution site Cd in-situ detoxification method based on biogas residues. The biogas residues, a carbon source and sulfate are prepared into chemical agents to be injected into Cd-containing soil in an in-situ manner; and then a special constructing and curing manner is adopted, and a fixation ecological bacterium agent is made to gradually permeate into the underground to fix Cd of the deep-layer polluted soil. By means of the method, the Cd-containing site large in pollution depth can be efficiently restored at low cost; and meanwhile, waste is treated through waste, and the biogas residues are treated.

Description

technical field [0001] The invention provides a new method for treating Cd-contaminated soil, which is mainly aimed at the soil with high Cd-contaminated depth, and injects biogas residue, carbon source and sulfate into the Cd-containing soil in situ, and then uses a special The maintenance method can efficiently fix Cd while saving costs, and 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 Cd-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 s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/08
CPCB09C1/10B09C1/08B09C2101/00
Inventor 张大磊李公伟郝志鹏赵昱皓
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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