Comprehensive repair method of heavy metal contaminated soil and application

A technology for polluted soil and remediation methods, applied in the field of environmental pollution control and new energy, can solve the problems of crop products with no obvious economic value, single heavy metal species, and low biomass of heavy metal hyperaccumulation plants, so as to avoid re-pollution and avoid The effect of secondary pollution and reduction of use
CN104324933AInactive Publication Date: 2015-02-04TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2015-02-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a comprehensive repair method of heavy metal contaminated soil and application, and belongs to the technical field of environmental pollution control and new energy. The method provided by the invention comprises the following steps: cultivating sorgos on the heavy metal contaminated soil to absorb heavy metals via the sorgos, harvesting the sorgos after the sorgos are ripe, crushing the sorgo straws, performing solid fermentation, distilling to recycle ethanol in the fermentation product after fermentation, primarily drying the distillation residues, combined firing the distillation residues with crop roots and leaves, and recycling and treating the heavy metals in the ash. The method provided by the invention has the advantages of high crop biomass and high heavy metal absorption efficiency, meanwhile, the produced straws can be used for fermenting to produce biofuel, such secondary pollutants as biogas slurry and biogas residue can not be produced after fermentation, thus the environmental benefits are good; ears of sorghum can be used for producing a culture medium or used as a feed, thus having huge social benefit and economic benefit and being suitable for industrial promotion.
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Description

technical field

[0001] The invention relates to a comprehensive restoration method and application of heavy metal-contaminated soil, in particular to a restoration method for heavy metal-cadmium-contaminated soil, which belongs to the technical fields of environmental pollution control and new energy. Background technique

[0002] Due to pollution caused by mining, metallurgy, chemical industry and other industries, the cultivated land area polluted by heavy metals in my country has reached 20 million hectares, accounting for 1 / 6 of the total cultivated land area in the country. Among them, cadmium pollution is the most serious, and the prevention and control situation is very severe. showing an increasing trend. Compared with other major heavy metal pollutants, cadmium is more easily adsorbed by crops. Because of its strong biological toxicity, it causes serious food safety hazards. Cadmium pollution sources are mainly lead-zinc mines, non-ferrous metal smelting, electropl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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