Method for determining heavy metal emission management and control value based on critical load

Abstract

The invention discloses a method for determining a heavy metal emission management and control value based on a critical load. The method is based on a biogeochemical process of heavy metals, and studies the trending processes of the biogeochemical process under different land utilization modes. The method comprises the steps of: firstly, optimizing a traditional critical load model according to aplant absorption type and water environment migration and transformation model; secondly, determining a critical load value based on three environmental effects of current situation balance, a waterenvironment effect and a health risk; thirdly, carrying out critical load drawing and supercritical load drawing; and finally, determining a final heavy metal emission management and control value according to a probability distribution method. Through ingenious design, a spatial refined heavy metal critical load model is further constructed, the degrees and ranges of heavy metal supercritical loads under different environmental effects are recognized, heavy metal emission control values under different land utilization modes and different management targets are determined, and the method canbe applied to pollution source control management.

Description

technical field [0001] The invention relates to the technical field of prevention and control of soil heavy metal pollution, in particular to a method for determining a control value of heavy metal discharge based on a critical load. Background technique [0002] In recent years, with the widespread use of chemical fertilizers and pesticides, large-scale industrial, traffic emissions, and urban expansion, the problem of heavy metals in my country's soil has become increasingly significant, seriously threatening the ecological environment and human health. This requires people to pay attention to the hazards of heavy metals, and to effectively prevent, control and manage the discharge and accumulation of heavy metals. Critical load mapping is an important tool for the prevention and control of heavy metals. It can prevent the human input of various pollutants and the occurrence of pollution hazard events through source blocking. Compare the actual heavy metal input flux with ...

AI Technical Summary

Problems solved by technology

The BCF value of heavy metal enrichment factor will be affected by many environmental factors, such as the type of crops, natural environment, soil properties, climate, soil spatial heterogeneity, etc., which makes it difficult to find a suitable one during the calculation process. BCF value to measure the heavy metal uptake capacity of crops in a region

[0011] (2) The process is cumbersome

In order to calculate the value of the heavy metal enrichment factor BCF, it is necessary to measure the heavy metal content in the soil and crops in the research process, which requires us to collect plant samples, sample processing and content determination analysis in the research area, as well as research The pre-field and post-experiment work will be particularly cumbersome

[0012] (3) Lack of management value for pollution source control

Moreover, the existing technology 2 is only applicable to the critical load estimation of cultivated land, but there is no corresponding estimation method for the estimation of non-cultivated land

[0019] (2) The estimation process is not rigorous enough

Different land use patterns should be estimated corresponding to different environmental effects, but the existing technology only uses the status quo balance model to estimate the cultivated land, which is obviously not rigorous enough

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