Multilevel index empowerment method for evaluating passivation restoring effect of polluted soil

Abstract

The invention provides a multi-level index weighting method for evaluating the effect of passivation restoration of polluted soil. The method of the present invention includes index establishment, graded assignment, weight distribution, and comprehensive evaluation, and specifically, according to the occurrence characteristics and interaction laws of heavy metals in the soil-crop-passivator system, quantitative technical, economic, ecological and Social factors establish an index system for evaluating the effectiveness of in situ passivation remediation of heavy metal contaminated farmland (4 first-level indicators and 19 second-level indicators); through risk and effect comparison, the evaluation indicators are graded and weighted to obtain a soil-crop-passivation The comprehensive scores of different combinations of soil-crop-passivation agents were compared to obtain the in-situ passivation remediation effect of heavy metal-contaminated farmland as the evaluation result. The method can be used for risk and effect prediction of heavy metal-contaminated farmland soil passivation remediation and similar technical systems, and formulation of prevention and control countermeasures.

Description

technical field [0001] The invention relates to a multi-level index weighting method for evaluating the effectiveness of passivation restoration of polluted soil, and belongs to the technical field of risk and effect evaluation of environmental pollution control technology. Background technique [0002] The primary and urgent goal of solving heavy metal pollution in farmland soil is to ensure the safety of agricultural products. The heavy metal content of agricultural products is mainly affected by the dual effects of soil external factors and crop internal factors. Based on the dual influencing factors of heavy metal content in agricultural products, there may be two ways to regulate the influencing factors through physical, chemical or biological means to ensure the safety of agricultural products: one is passivation restoration technology, by changing the form of heavy metals in soil, such as by applying passivating agent to reduce the effective content of heavy metals i...

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Problems solved by technology

[0003] At present, passivation remediation technology has been applied to varying degrees in heavy metal-contaminated cultivated soil in typical areas of my country. However, the design and implementation of passivation remediation technology are still in the initial stage of development, and the risk and effectiveness evaluation indicators of passivation remediation technology Single, there is no unified understanding of the durability evaluation of the passivation effect, the fine-grained supervision of the restoration process, and the medium and long-term safety of cultivated soil pollution restoration, and it is difficult to obtain credible and scalable methods and conclusions

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