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Novel pollution site Cu in-situ detoxification method

An on-site, in-situ technology, applied in the field of new treatment of Cu-contaminated soil, can solve the problems of secondary pollution, high energy consumption, secondary soil pollution, etc., and achieve the effects of strong natural tolerance, cost reduction, and avoidance of excavation.

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, the mixed solution reacts 1 day, obtains Cu soil remediation agent;

[0017] (2) Inject the restoration agent in step (1) intermittently into the Cu-containing soil under pressure at an injection pressure of 0.1-1 MPa, with an average injection volume of 0-500 L per square meter per day, 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 make up for it, so that the agent can continuously seep downward; after 2 years of project implementation, Cu is dissolved in the soil at a depth of more than 20 meters Cu c...

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 Cu soil remediation agent;

[0021] (2) Inject the restoration agent in step (1) intermittently into the Cu-containing soil under pressure at an injection pressure of 0.1-1 MPa, with an average injection volume of 0-500 L per square meter per day, 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 it, so that the agent can continuously seep downward; one year after the project is implemented, Cu will be dissolved in the soil above 40 meters dee...

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Abstract

The invention provides a novel pollution site Cu in-situ detoxification method. Sludge, a carbon source and sulfate are prepared into chemical agents to be injected into Cu-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 Cu of the deep-layer polluted soil. By means of the method, the Cu-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 present invention provides a new method for treating Cu-contaminated soil, which is mainly aimed at the soil with high Cu-contaminated depth. Sludge, carbon source and sulfate are formulated into medicaments and injected into the Cu-containing soil in situ, and then special The maintenance method can efficiently fix Cu 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 Cu. Current methods for treating Cu-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 soli...

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 张大磊李瑞栋王欣玉
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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