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Soil cadmium passivator and processing method thereof

A passivating agent and soil technology, which is applied in the restoration of heavy metal-contaminated soil in farmland, and in the field of repairing heavy metal-contaminated soil in farmland, can solve the problems of long bioremediation cycle, damage to farmers' income, and reduce the bioavailability and mobility of heavy metal pollutants. Achieve the effects of reducing the content of available cadmium, reducing the content of available Cd, and improving utilization and stability

Inactive Publication Date: 2018-04-06
湖北农谷畅响土壤修复科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the restoration methods of cadmium in soil mainly include physical measures: guest soil method, soil replacement method, etc.; It is a green and eco-friendly technology mainly used to remove heavy metal pollution in soil. It has become an important means to solve the problem of heavy metal pollution in soil. However, there are problems such as long bioremediation cycle and long-term occupation of farmland soil will damage farmers' income. ;Chemical measures: chemical passivation reduces the bioavailability and mobility of heavy metal pollutants by means of heavy metal passivation agents, so as to achieve the purpose of remediation

Method used

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  • Soil cadmium passivator and processing method thereof
  • Soil cadmium passivator and processing method thereof

Examples

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Effect test

Embodiment example 1

[0050] The raw materials of the passivator collected and prepared include the following components according to the weight ratio: 25 bentonite, 10 lime, 20 ferric chloride, 30 decomposed straw, and 15 phosphate fertilizer; among them, bentonite and lime are purchased from the market in Wuhan City, Hubei Province, and the source of decomposed straw In the abandoned crops in Jingmen City, diammonium phosphate and ferric chloride are chemically pure reagents for phosphate fertilizer. The above raw materials are dried in the sun, pulverized and sieved to 20 meshes through a standard sieve to obtain granular raw materials, which are uniformly mixed to obtain a soil cadmium passivator.

Embodiment example 2

[0052] The raw materials of the passivator collected and prepared include the following components according to the weight ratio: 20 bentonite, 10 lime, 20 ferric chloride, 35 decomposed straw, and 15 phosphate fertilizer; among them, bentonite and lime are purchased from the market in Wuhan City, Hubei Province, and decomposed straw comes from In the abandoned crops in Jingmen City, diammonium phosphate and ferric chloride are chemically pure reagents for phosphate fertilizer. The above raw materials are dried in the sun, pulverized and sieved to 20 meshes through a standard sieve to obtain granular raw materials, which are uniformly mixed to obtain a soil cadmium passivator.

Embodiment example 3

[0054] The raw materials of the passivator collected and prepared include the following components according to the weight ratio: 25 bentonite, 5 lime, 20 ferric chloride, 35 decomposed straw, and 15 phosphate fertilizer; among them, bentonite and lime are purchased from the market in Wuhan City, Hubei Province, and the source of decomposed straw In the abandoned crops in Jingmen City, diammonium phosphate and ferric chloride are chemically pure reagents for phosphate fertilizer. The above raw materials are dried in the sun, pulverized and sieved to 20 meshes through a standard sieve to obtain granular raw materials, which are uniformly mixed to obtain a soil cadmium passivator.

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Abstract

The invention discloses a soil cadmium passivator which is characterized by comprising the following raw materials in parts by weight: 15-25 parts of bentonite, 5-10 parts of lime, 15-25 parts of ferric chloride, 20-35 parts of decomposed straws and 10-15 parts of phosphatic fertilizer. The soil cadmium passivator has the advantages that the heavy metal passivator in the invention has an excellentadsorption-chelation effect, cadmium in soil can be effectively fixed, and available cadmium in the soil is prevented from entering crops; and by controlling the conditions such as the soil pH value,soil moisture content, passivator addition and the like, the utilization rate and stability of the soil heavy metal passivator can be effectively improved. The method is low in cost, simple and easyto operate, high in practicality, high in safety, excellent in stability and excellent in soil cadmium passivating effect, does not cause secondary pollution to the soil, does not influence the quality and yield of crops, can effectively reduce the content of available cadmium in the soil, is suitable for farmland soil subjected to moderate heavy metal pollution, and has wide application value andmarket space.

Description

technical field [0001] The invention belongs to the category of soil pollution prevention and restoration of the discipline of environmental science and engineering in the technical field of environmental protection, and relates to a method for repairing heavy metal-contaminated soil in farmland, which is mainly used in the repair of heavy metal-contaminated soil in farmland. Background technique [0002] Soil is an important part of the earth's environment. The quality of the soil environment is closely related to our life. It is also an important part of the ecological environment, and it is the final destination of various pollutants. 90% of the pollutants in the world are finally stranded in in the soil. [0003] Soil heavy metal pollution has the characteristics of universality, concealment, superficial aggregation and regionality, complexity, irreversibility, persistence, seriousness after pollution, difficult treatment and long cycle, which makes it more difficult to ...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08C09K109/00
CPCC09K17/40B09C1/08C09K2109/00
Inventor 王帅高鷃铭钟早
Owner 湖北农谷畅响土壤修复科技股份有限公司
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