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Method for treating soil cadmium-arsenic combined pollution by using multifunctional manganese-based material

A manganese-based material and composite pollution technology, which is applied in the restoration of polluted soil, fertilizer mixture, soil conditioning materials, etc., can solve the problems of arsenic reduction, activity increase, and long-term stabilization of soil cadmium and arsenic, etc., to achieve Fix and inhibit rice absorption, reduce the toxic effect of cadmium on rice, and reduce the effect of cadmium absorption

Inactive Publication Date: 2020-06-16
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Application Information

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Problems solved by technology

Although this type of method has played a good role in fixing cadmium and arsenic, it cannot solve the problems of the reduction of arsenic under anaerobic conditions, the increase in activity, the re-release of cadmium and arsenic caused by the dissolution of iron minerals, and the physiological absorption of crops. Meet the effect of long-term stabilization of soil cadmium and arsenic

Method used

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  • Method for treating soil cadmium-arsenic combined pollution by using multifunctional manganese-based material
  • Method for treating soil cadmium-arsenic combined pollution by using multifunctional manganese-based material
  • Method for treating soil cadmium-arsenic combined pollution by using multifunctional manganese-based material

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preparation example Construction

[0031] The preparation method of manganese-based material in the embodiment is as follows:

[0032] Dissolve 1 part of potassium permanganate into 250 parts of deionized water, then add 9 parts of zeolite and stir. The above suspension was heated at 100° C. for 10 minutes, filtered, washed several times with deionized water, and then dried at room temperature to obtain a manganese-based material. Wherein said parts are parts by mass.

Embodiment 1

[0034] The compounding of manganese-based material and limestone is uniformly mixed according to the ratio of 1 part of manganese-based multifunctional material and 10 parts of limestone to obtain the compounded material;

[0035] Mix the above-mentioned compound material with the polluted soil at a mass ratio of 1:10; after 3 weeks of flooding cultivation, sow rice seedlings in the above soil, and continue to flood the cultivation (the height of the water surface is 2-3 cm).

Embodiment 2

[0037] Manganese-based materials and limestone were mixed in a weight ratio of 1:10; the pH value of the soil was 6.6, and the above-mentioned composite material and polluted soil were mixed in a mass ratio of 1:5; Sow rice seedlings in the middle, and carry out flooding culture (water surface height is 2-3 centimeters).

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Abstract

The invention belongs to the technical field of environmental protection, and particularly discloses a method for treating soil cadmium-arsenic combined pollution by using a multifunctional manganese-based material. The method specifically comprises the steps: uniformly mixing the multifunctional manganese-based material with cultivated land soil; a preparation method of the multifunctional manganese-based material is prepared by the following steps: uniformly mixing a potassium permanganate aqueous solution with zeolite, and stirring to obtain a turbid liquid; heating the turbid liquid for reaction, drying to obtain a manganese-based material after the reaction is finished, and compounding the manganese-based material with limestone to obtain the multifunctional manganese-based material.According to the invention, permanganate is loaded on a zeolite mineral material, so that the oxidation and release rate of permanganate is reduced, and the long-term effect of permanganate in soil arsenic oxide and cadmium and arsenic immobilization is improved; Mn<2+> ions can also improve the antagonism of crops such as rice and the like on cadmium, and remarkably reduce the absorption of cropssuch as rice and the like on cadmium and the toxic action of cadmium on rice.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for treating cadmium-arsenic composite pollution in soil by a multifunctional manganese-based material. Background technique [0002] It is very difficult to control soil cadmium and arsenic complex pollution in my country, resulting in frequent occurrence of rice and other agricultural products exceeding the standard. The key to the difficulty of treatment is reflected in the following aspects: 1) The physical and chemical properties of cadmium and arsenic pollutants are greatly different, and their activity is in the opposite trend to key factors such as soil pH; 2) Under anaerobic conditions, microorganisms directly cause iron ore The reductive dissolution of substances and the release of cadmium and arsenic. At the same time, pentavalent arsenic is gradually reduced to trivalent under reducing conditions, which is more toxic and more lik...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C09K17/06C09K101/00
CPCB09C1/08C09K17/06B09C2101/00C09K2101/00
Inventor 马义兵方利平李芳柏
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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