Dual limit value heavy metal pollution degree degrading method

A technology of pollution degree and grading method, which is applied in the restoration of polluted soil, etc.

Active Publication Date: 2015-08-12
TIANJIN MUNICIPAL ENG DESIGN & RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of this, the present invention aims to propose a method for grading the pollution degree of heavy metals with double limits, so as to

Method used

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  • Dual limit value heavy metal pollution degree degrading method
  • Dual limit value heavy metal pollution degree degrading method

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Embodiment 1

[0034] Such as figure 1 As shown, a dual-limit heavy metal pollution degree classification method includes the following steps,

[0035] 1) Combining the relevant soil standards and the local soil background value of the project, and through the environmental risk assessment, determine the base content value M and limit value N of the total heavy metal content applicable to the project; where the base content value is the environmental permit value, A value lower than this value is safe and need not be treated; a value higher than this value is a pollution value, which has been considered for treatment; a limit value content value is a repair action value, and it must be treated if it exceeds this value.

[0036] 2) Combined with the functional zoning and land attributes after the project regional governance, the effective mobility of heavy metals can be judged by analyzing the chemical form composition, combined with the relevant national leaching concentration standards, and...

Embodiment 2

[0044] Such as figure 2 As shown, a dual-limit heavy metal pollution degree classification method includes the following steps,

[0045] 1) Combining the relevant soil standards and the local soil background value of the project, and through the environmental risk assessment, determine the benchmark content value M and limit value content N of the total heavy metal content applicable to the project, wherein the total heavy metal content has two sets Level limit content, which are the first limit value N1 and the second limit content N2, and N1

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Abstract

The invention provides a dual limit value heavy metal pollution degree degrading method, which is based on two dimensions with two limit values namely total heavy metal content and leaching concentration. The benchmark value and limit value of total heavy metal content are used to grade polluted soil or sediment, the control on total heavy metal content is emphasized, and the environment capacity of soil and sediment is increased. The benchmark value and limit value of leaching concentration of heavy metals are used to grade polluted soil or sediment, the control on the heavy metal chemical morphology easy for mobility is emphasized, and the risk that heavy metals in the soil and sediment migrate to the environment is reduced. The provided method solve that problems that (1) the method that solely relies on total amount to grade cannot really represent the bio-toxicity and mobility of pollutants; (2) the operation of the method that solely relies on morphology is bad, moreover, the evaluation is exaggerated, and the result is not accord with the actual situation.

Description

technical field [0001] The invention belongs to the technical field of treatment and restoration of heavy metal-contaminated soil or water body sediment bottom mud, and in particular relates to a dual-limit heavy metal pollution degree grading method. Background technique [0002] At present, there are two methods commonly used at home and abroad to evaluate the heavy metal pollution degree of soil and water sediment sediment. One is to classify based on the difference between the total content of heavy metals and the target value of the soil. Such methods are: Single pollution index method, Nemerow pollution comprehensive index method, potential ecological hazard index method. With the in-depth understanding of the biological toxicity of human heavy metals, a second classification method has emerged, which is to evaluate the pollution status of heavy metals based on the morphology of heavy metals, and provide a more scientific basis for the treatment of heavy metal pollutio...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 魏新庆王松王立彤张云霞王秀朵王瑞潘留明张泳张雪梅张建华史志利王浩
Owner TIANJIN MUNICIPAL ENG DESIGN & RES INST
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