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Method for passivating heavy metal contaminated soil

A technology for polluted soil and heavy metals, applied in the restoration of polluted soil, chemical instruments and methods, land preparation methods, etc. The effect of passivation

Inactive Publication Date: 2020-09-08
中节能大地环境修复有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved in the present invention is to overcome the defects of poor passivation effect and low crop yield in the passivation method of heavy metal-contaminated soil in the prior art, thereby providing a method for passivation of heavy metal-contaminated soil

Method used

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  • Method for passivating heavy metal contaminated soil
  • Method for passivating heavy metal contaminated soil
  • Method for passivating heavy metal contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] The present embodiment provides a method for passivation of heavy metal-contaminated soil in a paddy field, selects 7000 square meters of heavy metal-contaminated plots, and then takes 3500 square meters of them to carry out the following steps successively:

[0088] (1) Drainage and site leveling: After the farmland is drained, use bulldozers to clean up the straw on the surface and level the site. After cleaning the straw, the surface soil is basically exposed, and there are no obvious potholes in the cultivated land;

[0089] (2) Passivating agent spreading: 30 times of sampling granules altogether, 30 times are all qualified; Sampling liquid medicament (7wt% aqueous solution) 30 times, 30 times are all qualified; Adopt spreader to evenly spray 735kg above-mentioned sampling inspection earlier and pass liquid medicament (7wt% aqueous solution); then adopt spreader to evenly spread 2940kg above-mentioned sampling qualified granule medicament;

[0090] (3) Rotary tilla...

Embodiment 2

[0107] The present embodiment provides a method for passivation of heavy metal-contaminated soil in a paddy field. Select 7,000 square meters of polluted plots, and then take 3,500 square meters of them to carry out the following steps successively:

[0108] (1) Drainage and site leveling: After the farmland is drained, use bulldozers to clean up the straw on the surface and level the site. After cleaning the straw, the surface soil is basically exposed, and there are no obvious potholes in the cultivated land;

[0109] (2) Spraying of passivating agent: altogether 30 times of random inspection of granules, all qualified for 30 times; 30 times of random sampling of liquid medicine (7wt% aqueous solution), all qualified for 30 times; first adopt the spreader to evenly spray 1102.5kg of qualified samples Liquid medicament (7wt% aqueous solution); Then use a spreader to evenly spread 6247.5kg of granular medicaments that have passed the sampling inspection;

[0110] (3) Rotary ti...

Embodiment 3

[0127] The present embodiment provides a method for passivation of heavy metal-contaminated soil in a paddy field. Select 7,000 square meters of polluted plots, and then take 3,500 square meters of them to carry out the following steps successively:

[0128] (1) Drainage and site leveling: After the farmland is drained, use bulldozers to clean up the straw on the surface and level the site. After cleaning the straw, the surface soil is basically exposed, and there are no obvious potholes in the cultivated land;

[0129] (2) Spraying of passivating agent: 30 times of sampling granules in total, 30 times are all qualified; 30 times of sampling 1% liquid medicament are in total, 30 times are all qualified; 30 times of sampling liquid (7wt% aqueous solution) are in total, 30 times of which Qualified; first use a spreader to evenly spray 262.5kg of a qualified 1% aqueous solution of liquid medicine, then irrigate until the water surface is 5cm higher than the ground surface, let it ...

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Abstract

The invention provides a method for passivating heavy metal contaminated soil. The method comprises the following steps of performing passivation construction: sequentially performing passivator spreading, rotary tillage, pulping, first standing and first draining on the heavy metal contaminated soil; and performing redundant passivator removal: performing flood irrigation until the water surfaceis higher than the earth surface of the passivated soil, and performing second standing and second draining. Rotary tillage mixing in an oxidation environment and pulping mixing in a reduction environment are cooperatively performed, so that the construction efficiency is improved, and the reaction of a passivator and heavy metal is promoted; meanwhile, redistribution of the passivator and balanced passivation of the contaminated soil are promoted; after the passivation construction, namely the sufficient reaction of the passivator, the flood irrigation is carried out until the water surface is higher than the earth surface of the passivated soil, and standing is carried out, so that redistribution work of the passivator and the balanced passivation of the contaminated soil can be effectively promoted; and finally the redundant passivator is removed from an area with the relatively low contamination degree (few passivators are needed) through drainage, so that the soil is effectively repaired, and the passivation effect and the crop yield are improved.

Description

technical field [0001] The invention relates to the field of heavy metal polluted soil treatment, in particular to a passivation method for heavy metal polluted soil. Background technique [0002] With the rapid economic growth, the overall quality of the soil environment is not optimistic, especially the environmental quality of cultivated land is worrying. Heavy metal pollution in farmland soil has the characteristics of concealment, long-term and irreversibility, which directly threaten the safety of agricultural products and human health. Therefore, the prevention and control of heavy metal soil pollution is the top priority of soil governance. [0003] At present, for the prevention and control of heavy metal soil pollution, the common restoration methods can generally be divided into physical restoration methods, chemical passivation restoration methods, biological restoration methods and agricultural ecological restoration methods. Among them, the chemical passivation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01B79/00A01B79/02B09C1/08B09C1/10C05G3/80C09K17/40C09K17/02C09K101/00
CPCA01B79/00A01B79/02B09C1/08C05D9/02C05D3/02C05D9/00C05G3/80C09K17/40C09K17/02B09C2101/00C09K2101/00C05F11/00
Inventor 肖满杨鹤峰万鹏卜繁婷王轶嘉
Owner 中节能大地环境修复有限公司
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