Remediation method for heavy metal contaminated soil

Abstract

The invention relates to the field of soil remediation methods, and particularly discloses a remediation method for heavy metal contaminated soil, according to the remediation method, high heavy metals in the soil are enriched and converted through a bioremediation agent, the toxicity of the heavy metals in the soil is reduced, then the heavy metals in the soil are passivated through a passivating agent, and the toxicity of the heavy metals is generally reduced, and finally, restoring of the soil fertility by using an organic fertilizer is carried out, and further treating of the heavy metals remaining in the soil is carried out by using the organic fertilizer. According to the method, the heavy metal contaminated soil is remedied through progressive step-by-step treatment, the content of toxic heavy metal in the soil is effectively reduced, especially, an efficient conversion effect on mercury in the soil is achieved, and finally remediation of the soil is achieved.

Description

technical field [0001] The invention relates to the field of soil remediation methods, in particular to a method for remediation of heavy metal polluted soil. Background technique [0002] Heavy metal pollution refers to environmental pollution caused by metals or their compounds with a density above 5, mainly caused by human factors such as mining, exhaust gas discharge, sewage irrigation, and the use of heavy metal products. Due to the discharge of industrial "three wastes" motor vehicle exhaust, sewage irrigation and the use of pesticides, herbicides, fertilizers, etc., as well as the development of mining, the soil, water quality and atmosphere have been seriously polluted. In recent years, soil heavy metal pollution has attracted great attention. The basis for the development of high-quality agriculture is high-quality soil. With the development of science and technology, soil heavy metal pollution has become more and more serious. Heavy metals are more likely to endang...

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Problems solved by technology

[0006] At present, the treatment of heavy metal pollution in soil includes the soil replacement method, which can be effective immediately, but it cannot fundamentally solve the problem, and the project is huge; the thermal restoration method has high energy consumption, high cost, and is easy to damage the microbial structure of the soil; the current Bioremediation is a method recognized by the public, but its restoration of heavy metals in soil is relatively simple, often only effective for certain heavy metals, and most of the restoration effects are often less than 50%, especially for mercury and highly toxic heavy metals such as lead are difficult to handle

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