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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

Inactive Publication Date: 2012-10-10
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of inorganic passivation agents can greatly reduce the content of available heavy metals in the soil, thereby effectively inhibiting the content in plants, but a large amount of application of inorganic passivation agents will have a certain impact on the physical properties of the soil, and the overall fertility level will also decrease.
The general passivation agent is mainly based on inorganic materials. Although the passivation effect of inorganic passivation agent is long-lasting, it will cause great damage to the soil properties.
Organic passivators have both the functions of passivating heavy metals and improving the physical and chemical properties of soil, but they are easy to decompose and the passivation effect is not durable.

Method used

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  • Preparation and application method of soil heavy metal composite passivating agent
  • Preparation and application method of soil heavy metal composite passivating agent
  • Preparation and application method of soil heavy metal composite passivating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of soil heavy metal compound passivation agent: A. Preparation of plant ash: select cassava, corn and rice straw for incineration and pass through a 40-mesh sieve for later use; B. Preparation of silkworm excrement: select silkworm excrement and grind it through a pulverizer Cross 40 mesh sieves for subsequent use; C. according to the ratio of 25% slaked lime, 20% potassium dihydrogen phosphate, 20% plant ash and 35% silkworm excrement, mix four kinds of passivation materials, after fully stirring, make Soil-forming heavy metal compound passivation agent;

[0025] (2) Mixing with soil: without adding passivation materials as a control treatment, mix the passivation agent with the heavy metal-contaminated soil at a mass ratio of 1:50, stir evenly, and keep the soil moisture up to 60-70% of the maximum water holding capacity in the field. %.

[0026] (3) Reaction: After 30 days, use the EDTA extraction method to measure the content of available Pb and Cd ...

Embodiment 2—4

[0028] The difference from Example 1 is that the proportions of various raw materials are different, see Table 1 for details; the preparation method and measurement method are the same as in Example 1.

[0029] Table 1: Raw material composition in each embodiment

[0030]

[0031] figure 1 It reflects the influence of passivation treatment on soil available Pb in different examples. Compared with the control group, the available Pb in the soil of the four examples decreased by 47.61%, 20.23%, 42.17%, and 23.73%, respectively.

[0032] figure 2 It reflects the influence of passivation treatment on soil available Cd in different examples. Compared with the control group, the available Cd in the soil of the four examples decreased by 50.57%, 20.15%, 45.29%, and 25.58%, respectively.

[0033] It can be seen from the figure that in each embodiment, the passivation effect of the passivating agent on the two heavy metals Pb and Cd is not much different. With the increase of ...

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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.

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

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/06B09C1/08C09K101/00
Inventor 王英辉黎大荣陈仁义张金莲郭送军董海丽
Owner GUANGXI UNIV
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