Chemical leaching restoration method for copper-contaminated soil

A technology of chemical leaching and remediation method, applied in the field of leaching and remediation of copper-contaminated soil, can solve problems such as lack of research, and achieve the effects of low environmental risk, strong operability, and high remediation efficiency
CN103706628AInactive Publication Date: 2014-04-09LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
Publication Date
2014-04-09
Estimated Expiration
Not applicable · inactive patent
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Abstract

The invention discloses a chemical leaching restoration method for copper-contaminated soil. The method is high in biodegradability and leaching efficiency. The method comprises the following steps of punching small holes in the bottom of a PVC (polyvinyl chloride) leaching column with an internal diameter of 5cm and a height of 15cm, fixing filter paper at the bottom of the leaching column, accurately weighing 100.00 grams of contaminated soil into the column, adding a 1 to 22mol / L BHMTPMPA [bis(hexamethylene triamine penta (methylene phosphonic acid))] solution to the upper end of the column in the ratio of the soil to the solution of 1:1 to 1:5 for one time, and determining the content of heavy metal copper in leachate after leaching, wherein 2 to 16 small holes are uniformly punched in the bottom of the leaching column; two layers of filter paper are fixed at the bottom of the column; the copper concentration of the contaminated soil is 800 to 2,975mg.kg<-1>. Due to the adoption of a measure for the enhanced restoration of the copper-contaminated soil with BHMTPMPA, the method has the characteristics of high restoration efficiency, high operability, low environmental risks and the like.
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Description

technical field

[0001] The invention relates to the technical field of leaching and restoration of copper-contaminated soil, and relates to a chemical leaching and restoration method for copper-contaminated soil. Background technique

[0002] The heavy metal Cu is not only one of the essential micronutrient elements for plant growth, but also a polluting element. Cu pollution in the soil environment mainly comes from Cu-containing fertilizers, Cu-containing pesticides, livestock and poultry manure, fly ash, domestic garbage, sludge, and wastewater from copper smelters. The ecotoxicity caused by excessive accumulation of Cu in the soil environment will inhibit the photosynthesis of plants, lead to crop yield reduction, and also pose a threat to the safety of the ecosystem and human health. A large amount of copper-contaminated soil needs to be repaired urgently.

[0003] In European and American countries, chemical leaching technology has been used to treat heavy metal-conta...

Claims

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