Chemical stabilization compound medicament for reducing heavy metal leaching concentration of soil

A technology of leaching concentration and chemical stability, applied in the restoration of polluted soil, etc., can solve the problems of reducing the leaching concentration of various heavy metals, which are rare, and achieve the effect of reducing migration ability, reducing leaching concentration, and easy promotion

Inactive Publication Date: 2012-02-22
SHENYANG ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most curing and stabilizing agents only target one kind of heavy metal, and the research on stabil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0008] Example 1

[0009] Take: 5 parts of Ca(OH) 2 , 4 parts of fly ash, 1 part of Na 2 CO 3 , 0.5 parts of polyacrylamide or modified Na 2 SO 4 , Mix uniformly to make the present invention.

[0010] Obtained soil from a complex heavy metal contaminated site in Shenyang, dried it in air, and ground it into the soil before treatment.

[0011] According to the present invention: the soil before treatment = 1:20, the present invention is added to the soil before treatment, and then water is adjusted so that the soil moisture content before treatment is 20%, and it is ventilated and maintained for 24 hours under natural conditions.

[0012] Use the method of "Determination of Solid Waste Leaching Toxicity" (GB / T15555.1-155555.11) to determine the leaching status of heavy metals in the soil.

[0013] The leaching concentrations of heavy metals in the soil before and after treatment in Example 1 are:

[0014] mg / L Pb Zn CdCu A compound heavy metal contaminated soil in Shenyang2.861.370....

Example Embodiment

[0015] Example 2

[0016] Take: 7 parts of Ca(OH) 2 , 3 parts of fly ash, 0.8 parts of Na 2 CO 3 , 0.5 parts of polyacrylamide and 0.5 parts of modified Na 2 SO 4 , Mix uniformly to make the present invention.

[0017] The rest is the same as in Example 1.

[0018] The leaching concentrations of heavy metals in the soil before and after treatment in Example 2 are:

[0019] mg / L Pb Zn Ni Lead contaminated soil in Shenyang 5.962.051.82 After the agent is stabilized0.570.630.75

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Abstract

The invention provides a chemical stabilization compound medicament for reducing a heavy metal leaching concentration of soil, and aims to solve the technical problem that: most solidification and stabilization medicaments are only directed at one heavy metal, and research on stabilization medicaments able to simultaneously reduce leaching concentrations of a plurality of heavy metals is uncommon. The main points of the invention lie in that: the medicament comprises 5-10 parts of Ca(OH)2, 2-5 parts of coal ash, and 0.1-2 parts of Na2CO3 that are mixed uniformly. The compound medicament provided in the invention can reduce leaching concentrations of a plurality of heavy metals in soil.

Description

technical field [0001] The invention relates to a chemically stabilized compound agent for reducing the leaching concentration of heavy metals in soil, and is specifically aimed at the treatment of complex heavy metal polluted soil. The so-called compound heavy metal-polluted soil refers to the soil polluted by two or more heavy metals of lead, cadmium, copper, zinc, chromium, and nickel. Background technique [0002] my country's heavy metal pollution is relatively serious. At present, heavy metal pollution incidents occur frequently, and the prevention and control of heavy metal pollution has received more and more attention at the national level. The "Heavy Metal Pollution Comprehensive Prevention and Control Plan" is the first approved 12th Five-Year Plan. my country's heavy metal-contaminated soil area is large, and the pollution persists for a long time. Many heavy metal-contaminated sites have been formed, many of which are complex heavy metal-contaminated sites, whic...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 孙俊惠怀胜王鑫李述贤陈辉郭传正
Owner SHENYANG ACAD OF ENVIRONMENTAL SCI
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