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Arsenic and cadmium compound polluted soil passivation agent and its preparation method and application method

A combined pollution and soil passivation technology, applied in the field of soil pollution control, can solve problems such as incomplete consideration of soil quality properties, difficulty in achieving simultaneous passivation with remediation technology, and achieve the effect of improving soil quality

Active Publication Date: 2021-02-09
ENVIRONMENT & PLANT PROTECTION INST CHINESE ACADEMY OF TROPICAL AGRI SCI
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  • Claims
  • Application Information

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Problems solved by technology

[0006] To sum up, in view of the prominent status quo of soil arsenic and cadmium compound pollution, and the existing remediation technology is difficult to achieve simultaneous passivation, and the defects of incomplete consideration of soil quality and properties, it is necessary to develop a new passivation method for arsenic and cadmium compound polluted soil. technology

Method used

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  • Arsenic and cadmium compound polluted soil passivation agent and its preparation method and application method
  • Arsenic and cadmium compound polluted soil passivation agent and its preparation method and application method
  • Arsenic and cadmium compound polluted soil passivation agent and its preparation method and application method

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Experimental program
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Effect test

Embodiment 1

[0036] Effects of different combinations of vermicompost and zero-valent iron on the passivation effect of arsenic and cadmium

[0037] The test soil was collected from arsenic and cadmium composite polluted soil in Dongfang City, Hainan Province. The soil was naturally air-dried, ground and passed through a 2mm sieve. The soil without passivating agent was used as the control treatment. After mixing the soil, put it into a plastic container and place it in a constant temperature incubator for cultivation. During this period, water is added by weighing every other day to maintain 70% of the field water capacity. After 2 months of cultivation, soil samples were collected, the water-soluble and effective content of arsenic and cadmium were measured, and the passivation rate was calculated.

[0038] Passivation rate = (water-soluble or available concentration of arsenic and cadmium in the control soil - water-soluble or available concentration of arsenic and cadmium in the soil ...

Embodiment 2

[0043] The effects of different combinations of vermicompost and zero-valent iron on the basic physical and chemical properties of the soil are shown in Table 3.

[0044]

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Abstract

The invention belongs to the field of soil pollution control, and discloses a passivation restoration agent for arsenic-cadmium compound polluted soil and its preparation method and application method, which uses vermicompost to enrich organic matter, realizes the adsorption and complexation of cadmium, and utilizes zero-valent iron in the The iron (hydroxide) oxide formed in the soil undergoes an adsorption precipitation reaction with arsenic, thereby realizing the simultaneous passivation of arsenic and cadmium. In addition, vermicompost can significantly improve soil quality, and can comprehensively treat arsenic-cadmium compound-contaminated soil. On the one hand, zero-valent iron, a strong reducing agent, is easily oxidized to form amorphous iron (hydroxide) oxides, providing more adsorption sites for arsenic and cadmium; on the other hand, vermicompost provides more organic matter in the soil, increasing The cation exchange capacity increases soil pH, which is beneficial to the adsorption and fixation of cadmium and reduces the activity. In addition, vermicompost and iron are also partially combined to form iron oxide-organic carbon complexes, which also help the soil to fix carbon and improve soil quality.

Description

technical field [0001] The invention belongs to the field of soil pollution control, and in particular relates to a passivation restoration agent for arsenic and cadmium compound polluted soil, a preparation method and a use method thereof. Background technique [0002] South my country is rich in mineral resources, and frequent mining activities lead to serious heavy metal pollution. Due to the accompanying phenomena of heavy metals and the influence of atmospheric deposition, heavy metals often present the characteristics of compound pollution, among which soil As and Cd compound pollution is often reported. The problem of arsenic and cadmium pollution in paddy fields is particularly prominent. Because rice is a crop rich in arsenic and cadmium, people's dietary intake of arsenic and cadmium has seriously endangered human health. Therefore, the control of soil arsenic and cadmium compound pollution is an urgent problem to be solved in today's soil environment problems. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/08C09K109/00
CPCB09C1/08B09C2101/00C09K17/40C09K2109/00
Inventor 潘攀刘贝贝吴琳符旖晴
Owner ENVIRONMENT & PLANT PROTECTION INST CHINESE ACADEMY OF TROPICAL AGRI SCI
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