Comprehensive evaluation method for remediation effect of heavy metal contaminated soil based on plants, soil and microorganisms

Abstract

The invention particularly discloses a comprehensive evaluation method for remediation effects of heavy metal contaminated soil based on plants, soil and microorganisms. The method comprises the steps that (1) a contaminated soil remediation effect evaluation system is constructed; (2) evaluation indicators are determined; (3) the evaluation indicators are subjected to normalization processing; (4) weights of all the evaluation indicators are determined; and (5) an evaluation score of remedied soil is calculated, and comparison is performed in combination with evaluation standards to obtain the remediation effects of the heavy metal contaminated soil treated by different remediation means. According to the evaluation method, the evaluation indicators include three criterion layer factors, nine element layer factors and fourteen indicator layer factors in total and cover content in the aspects of chemistry, microorganisms and plants, farmland functions and contamination remediation actual conditions are comprehensively considered, the method is suitable for comprehensive evaluation of contamination remediation work and large-range remediation work evaluation, and compared with existing evaluation methods, the method is more comprehensive, accurate and scientific.

Description

technical field [0001] The invention belongs to the technical field of pollution safety evaluation, in particular to a method for comprehensive evaluation of remediation effect of heavy metal polluted soil based on plants, soil and microorganisms. Background technique [0002] In recent years, due to the rapid development of industry and agriculture, as well as the acceleration of product production, consumption, and abandonment processes, more and more areas of soil have been polluted by heavy metals and organic pollutants. At present, more than 10% of my country's arable land is polluted by heavy metals, and the polluted area reaches tens of millions of hectares. The annual reduction in grain production and related economic losses due to heavy metal pollution in the country reaches 20 billion yuan. At the same time, since heavy metal elements in soil cannot be decomposed through physical, chemical and biological pathways, they are easy to accumulate and endanger human heal...

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Problems solved by technology

However, soil is an open system, and relying solely on the total amount of pollutants in the soil cannot comprehensively represent its risks to surrounding plants, animals, and human bodies, which is not conducive to a comprehensive and credible evaluation of the restoration effect, which is not conducive to land use and land conservation. planning decision

[0005] In recent years, scholars at home and abroad have made a lot of achievements in the evaluation of heavy metal pollution in soil according to their own research (Research Progress in Remediation and Remediation Effect Evaluation of Heavy Metal Contaminated Soil. China Agricultural Science Bulletin, 2014.30(20): p.161-167.), However, there are still few methods for comprehensive evaluation of the remediation effect of heavy metal-contaminated soil in farmland.

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