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Novel pollution site Zn in-situ detoxification method

A new type of technology, applied in the field of new treatment of Zn-contaminated soil, can solve the problems of secondary pollution, high cost, high energy consumption, etc., and achieve the effect of lasting and effective fixation, strong natural tolerance and cost reduction.

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

[0016] (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 sulfate (in SO4 record) / organic carbon mass ratio is 0.1: 1, and the mixed solution reacts 1 day, obtains Zn soil remediation medicament;

[0017] (2) Intermittent pressurized injection of the restoration agent in step (1) into the Zn-containing soil, the injection pressure is 0.5-1Mpa, and the average daily injection volume is 10-20 cubic meters per square meter, and continues until the restoration is completed;

[0018] (3) During the repair period, the average annual rainfall of the site is required to be above 200mm, and if it is insufficient, the method of spraying water on the surface should be used to supplement, so that the agent can continuously seep downward; after 2 years of project implementation, the soil Zn at a depth of more than 20 m...

Embodiment 2

[0020] (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 5-20%, the solid content is 5-25%, the organic carbon content is 5-25%, and the sulfate (in SO4 record) / organic carbon mass ratio is 0.5: 1, and the solution reaction after mixing is 2 days, obtains Zn soil remediation medicament;

[0021] (2) intermittently inject the restoration agent in step (1) into the Zn-containing soil, the injection pressure is 0.1-0.5Mpa, and the average daily injection amount is 30-50 cubic meters per square meter, and continues until the restoration is completed;

[0022] (3) During the repair period, the average annual rainfall of the site is required to be above 200mm, and if it is insufficient, the method of spraying water on the surface should be used to supplement, so that the agent can continuously seep downward; after one year of project implementation, Zn is dissolved in the soil above 40 meters...

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Abstract

The invention provides a novel pollution site Zn in-situ detoxification method. Sludge, a carbon source and sulfate are prepared into chemical agents to be injected into Zn-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 Zn of the deep-layer polluted soil. By means of the method, the Zn-containing site large in pollution depth can be efficiently restored at low cost; and meanwhile, waste is treated through waste, and the sludge is treated.

Description

technical field [0001] The invention provides a new method for treating Zn-contaminated soil, which is mainly aimed at the soil with high Zn-contaminated depth. Sludge, carbon source and sulfate are formulated into medicaments and injected into the Zn-containing soil in situ, and then special The maintenance method can efficiently fix Zn while saving costs, and belongs to the field of environmental protection. Background technique [0002] A large amount of soil is polluted by Zn due to the random discharge of mining and metallurgical wastewater. Current methods for treating Zn-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 m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 张大磊李瑞栋王欣玉
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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