Method for repairing heavy metal contaminated soil by nanometer zero-valent iron

A nano-zero-valent iron and contaminated soil technology, applied in the field of environmental remediation, can solve the problems of little soil remediation effect, achieve the effect of reducing leaching toxicity and bioavailability, small time and economic cost, and simple operation
CN106984640AInactive Publication Date: 2017-07-28HUNAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUNAN UNIV
Publication Date
2017-07-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for repairing heavy metal contaminated soil by nanometer zero-valent iron. The method comprises the following steps of: filling heavy metal contaminated soil in a fiberglass-reinforced column; introducing water until constant weight is obtained; and introducing nanometer zero-valent iron suspension liquid in the fiberglass-reinforced column to perform elution on the heavy metal contaminated soil. Through the adoption of the method disclosed by the invention, heavy metal with high toxicity in the soil can be eliminated or reduced once under the condition that the original ecological structure of the soil is not damaged, and secondary contamination of nanometer zero-valent iron and heavy metal desorption are avoided; and the method has the advantages of being simple in treating technology, low in cost and obvious in treatment effect.
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Description

technical field

[0001] The invention relates to the technical field of environmental restoration, in particular to a method for restoring heavy metal-contaminated soil with nanometer zero-valent iron. Background technique

[0002] In recent years, with the rapid development of industrialization and urbanization, the area of ​​cultivated land polluted by heavy metals such as Cd, Pb, Cu and Zn in my country is nearly 20 million hectares, accounting for about one-fifth of the total cultivated land area. Soil heavy metal pollution has become an issue that cannot be ignored. outstanding environmental issues. Studies have shown that even if the concentration of heavy metals in the soil is at a low level, it will still cause varying degrees of harm to macroscopic aquatic plants, algae, benthic animals, fish and microorganisms, and even affect food safety through food chain enrichment, indirectly affecting human beings. Health is a threat. Therefore, the remediation of heavy metal-...

Claims

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