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Soil conditioner for repairing heavy metal polluted farmland and production method of same

A soil conditioner and heavy metal technology, which is applied in the field of pollution remediation, can solve the problems of soil heavy metal pollution, complex process and high production cost, and achieve the advantages of reducing the toxicity of heavy metals in the soil, adding no chemical substances, and improving the utilization rate of fertilizer and water. Effect

Active Publication Date: 2017-04-26
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0004] However, the above scheme does not solve the problem of heavy metal pollution in the soil, and the process is complicated and the production cost is high

Method used

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  • Soil conditioner for repairing heavy metal polluted farmland and production method of same
  • Soil conditioner for repairing heavy metal polluted farmland and production method of same
  • Soil conditioner for repairing heavy metal polluted farmland and production method of same

Examples

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Effect test

Embodiment 1

[0030] A soil conditioner for repairing heavy metal pollution in farmland, including 30kg of pyrolysis biochar, 20kg of hydrothermal biochar, 20kg of diatomaceous earth compound and 1kg of cyclodextrin.

[0031] In this example, the diatomite compound is made by mixing diatomite powder and chitosan at a mass ratio of 3:1, and the pyrolysis biochar is made of hickory cattail charcoal at 450-600°C under inert gas conditions. It is obtained by calcining, and the hydrothermal biochar is obtained under high-pressure hydrothermal conditions at 180-240°C.

Embodiment 2

[0033] This example is basically the same as Example 1, except that this soil conditioner includes 40 parts of pyrolysis biochar, 30 parts of hydrothermal biochar, 30 parts of diatomaceous earth compound and 2 parts of cyclodextrin.

Embodiment 3

[0035] This example is basically the same as Example 1, except that this soil conditioner includes 35kg of pyrolysis biochar, 25kg of hydrothermal biochar, 25kg of diatomaceous earth compound, 10kg of sheep manure and 1.5kg of cyclodextrin. The moisture content of the sheep manure of the present embodiment is 5-7%.

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Abstract

The invention belongs to the technical field of pollution repairing and relates to a soil conditioner for repairing heavy metal polluted farmland and a production method of same. The soil conditioner includes biochar, minerals and cyclodextrin. The production method includes the steps of: (A) preparation of the biochar: calcining carya cathayensis peel carbon to obtain pyrolyzed biochar and performing high-pressure hydrothermal treatment to the carya cathayensis peel carbon to obtain hydrothermal biochar, and mixing the pyrolyzed biochar and the hydrothermal biochar to obtain the biochar; (B) preparation of the minerals: uniformly diatomite powder and chitosan according to the mass ratio of 3:1 to prepare a diatomite composite; (C) blending: uniformly mixing the pyrolyzed biochar, the hydrothermal biochar, the diatomite composite and sheep manure to prepare the soil repairing agent; and (D) granulation: mixing the soil repairing agent with cyclodextrin and performing granulation to obtain the soil conditioner. The soil conditioner, when being used for rice farmland, is economical and effective, allows in-situ repairing and has no addition of chemical substances.

Description

technical field [0001] The invention belongs to the technical field of pollution remediation, and relates to a soil conditioner for remediating farmland heavy metal pollution and a manufacturing method thereof. Background technique [0002] Due to problems such as long-term sewage irrigation and improper fertilizer application, China's farmland soil is lightly polluted by heavy metals, accounting for 80% of the pollution, among which cadmium is the most excessive element. Therefore, there is a long way to go to control soil pollution in China. Large areas of farmland soil need to be repaired while continuing production. This requires not only crop variety selection and farming system reform, but also the application of soil heavy metal in situ repair technology. The soil conditioner that can improve the physical and chemical properties of soil and has the function of passivating heavy metals is a new type of green production material that meets the current needs of agricultu...

Claims

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Application Information

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IPC IPC(8): C09K17/40C09K101/00
CPCC09K17/40C09K2101/00
Inventor 张敏陈永根单胜道洪孝挺袁小利
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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