Method for remediation of mercury contaminated soil by reducing volatile mercury emission flux

A release flux and soil remediation technology, applied in the field of mercury-contaminated soil remediation, can solve the problems of reduction and deficiency, achieve the effect of reducing release flux, simple method, and easy to realize large-scale promotion

Inactive Publication Date: 2019-10-15
INST OF GEOCHEM CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there have been extensive and in-depth studies on the environmental behavior, characteristics, laws and hazards of gaseous mercury pollution, but the related research on reducing and solving gaseous mercury pollution is still quite insufficient, and a lot of research work needs to be carried out in depth

Method used

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  • Method for remediation of mercury contaminated soil by reducing volatile mercury emission flux
  • Method for remediation of mercury contaminated soil by reducing volatile mercury emission flux
  • Method for remediation of mercury contaminated soil by reducing volatile mercury emission flux

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The polluted farmland was sorted and subdivided into 10 small cube fields of 1m×1m×0.1m, and each field was separated by a plastic film to prevent cross-contamination; then, 2.1kg of bentonite was put into one of the small fields and 0.35kg of diammonium hydrogen phosphate, mix bentonite and diammonium hydrogen phosphate with the soil evenly, and keep it stable for more than 10 days, and use a dynamic flux box connected to an atmospheric mercury detector to monitor the release flux of volatile mercury in polluted farmland soil in real time.

Embodiment 2

[0021] Drop into 1.4kg sodium selenite to a small field piece in embodiment 1, mix sodium selenite and soil, stabilize more than 10 days, adopt dynamic flux box to connect atmospheric mercury meter to monitor the volatility of polluted farmland soil in real time Mercury release flux.

Embodiment 3

[0023] Put 0.5kg biochar into a small field in Example 1, mix the biochar and soil evenly, and stabilize it for more than 10 days, and use a kinetic flux box to connect an atmospheric mercury meter to monitor the release flux of volatile mercury in polluted farmland soil in real time. quantity.

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Abstract

The invention discloses a method for remediation of mercury contaminated soil by reducing volatile mercury emission flux. The method includes the steps of: 1. consolidating contaminated farmland for subdivision into a plurality of identical small field blocks, and separating the small field blocks from each other by a film; and 2. putting a passivator and its composition for soil remediation intoall the small field blocks, mixing the substances evenly, and stabilizing the state for 10d or more. The method provided by the invention utilizes the chemical bond effect of the passivator and mercury, absorption effect and the like to immobilize mercury in contaminated soil, and can significantly reduce the emission flux of volatile mercury in contaminated farmland and reduce the hazard of atmospheric mercury pollution.

Description

technical field [0001] The invention relates to a mercury-polluted soil remediation method for reducing the volatile mercury release flux of polluted soil, and belongs to the technical field of farmland soil remediation and treatment. Background technique [0002] Mercury (Hg) is one of the most toxic heavy metal elements in the environment. Due to its special physical and chemical properties, it mainly exists in the atmosphere in the form of gaseous phase. sex pollutants. On the other hand, this gaseous mercury can also accumulate in vegetables and other crops through the respiration of leaves and enter the food chain, posing a huge threat to the health of residents. The sources of atmospheric mercury include natural sources and man-made sources, among which mercury volatilization from polluted soil is one of the sources. At present, there have been extensive and in-depth studies on the environmental behavior, characteristics, laws and hazards of gaseous mercury pollution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C09K17/02
CPCB09C1/08B09C2101/00C09K17/02
Inventor 张华申远黄国培徐国敏
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI
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