Preparation and application method of soil heavy metal composite passivating agent

A technology of heavy metals and passivating agents, applied in chemical instruments and methods, restoration of polluted soil, soil conditioning materials, etc. problem, to achieve the effect of significant passivation, improved soil fertility, and rapid repair
CN102719255AInactive Publication Date: 2012-10-10GUANGXI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGXI UNIV
Publication Date
2012-10-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a soil heavy metal composite passivating agent, comprising the following raw materials in percentage by mass of: 25% of slaked lime, 10-20% of monopotassium phosphate, 20-45% of plant ash and 20-45% of silkworm excrement. With the adoption of the soil heavy metal composite passivating agent disclosed by the invention, compared with a control group, an effective state lead content of the soil polluted by heavy metal is reduced by 20.23-47.61% within culture time of 30 days, and an effective state cadmium content is reduced by 20.15-50.57%; the passivating effect of the soil heavy metal composite passivating agent on the heavy metal is extremely obvious; and meanwhile, compared with the control group, the content of organic matters is improved by 48.62-64.47%, and the soil fertility is obviously improved. A method disclosed by the invention is applicable to repairing large-area heavy metal polluted soil and comprises the steps of repairing a heavy metal polluted farmland and repairing a heavy metal polluted mine; and the method has the advantages of lower cost, rapidness for repairing, simplicity in operation, feasible method and extremely great popularization value.
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Description

technical field

[0001] The invention relates to a method for preparing and using a heavy metal composite passivator for repairing soil polluted by heavy metals. Background technique

[0002] Soil heavy metal pollution is concealed, latent, accumulative and long-term, among which the more serious elements are mainly Pb, Cd and other elements. Soil heavy metal pollution will first affect the growth and development of plants, and then affect the yield and quality of crops. Finally, it will be enriched in human and animal bodies through the food chain, endangering the health of humans and animals, and causing cancer and other diseases. Therefore, it is extremely important to effectively control soil heavy metal pollution and reduce its harm for sustainable development.

[0003] The remediation of heavy metal-contaminated soil mainly includes physical, chemical and biological remediation methods, and each remediation method has its advantages and disadvantages. At present, the ...

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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