Method for repairing heavy metal-contaminated soil

Abstract

The invention discloses a method for repairing heavy metal-contaminated soil. The method comprises the steps: taking the soil which is contaminated by heavy metal cadmium and zinc, performing leachingoperation, planting Sedum alfredii Hance, performing harmless treatment, planting an interaction plant corn, removing the whole plant of Sedum alfredii Hance from the soil after a growth cycle, performing formation of a shading effect on the Sedum alfredii Hance through the number of the planted corn, detecting the concentration of heavy metal cadmium and zinc in the soil, and repeating the stepsother than leaching operation if the preset environmental safety standards are not met until the concentration of heavy metal cadmium and zinc in the soil reaches the preset standard requirements. According to the technical scheme, the technology of interaction between Sedum alfredii Hance and corn is adopted, the growth condition of Sedum alfredii Hance in summer is improved, so that normal growth of Sedum alfredii Hance is maintained in summer; and the method has the advantages of low cost, high operability, safety and the like when compared with traditional repair techniques.

Description

technical field [0001] The invention relates to the technical field of contaminated soil remediation, in particular to a method for remediating soil polluted by heavy metals. Background technique [0002] Sites polluted by heavy metals will cause changes in the physical, chemical and biological properties of the soil, and cause irritation and physiological toxicity to the plants and animals that depend on them for survival. It has a certain selection and induction effect on the biomass and species. While changing the soil environment and ecosystem, the heavy metals accumulated in the soil will be enriched through the food chain and eventually cause harm to human health. It will also cause long-term direct exposure to polluted sites. Residents have a greater risk of pain, which seriously threatens the health of residents. Therefore, it is particularly necessary to study the remediation of heavy metal-contaminated soil in the research site. [0003] Cadmium and zinc are comm...

AI Technical Summary

Problems solved by technology

Although the traditional method of covering with sunshade nets can alleviate the problem of the southeast sedum safely in summer to a certain extent, in the process of large-scale engineering implementation and application, the cost is high, the space utilization rate is not high, and the economic benefits are not high

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