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Passivator for arsenic-cadmium composite contaminated soil as well as preparation method and application method thereof

A technology of compound pollution and soil passivation, applied in the field of soil pollution control, can solve the problems of incomplete consideration of soil quality characteristics and difficulty in achieving simultaneous passivation of remediation technology, so as to achieve the effect of improving soil quality.

Active Publication Date: 2019-11-22
ENVIRONMENT & PLANT PROTECTION INST CHINESE ACADEMY OF TROPICAL AGRI SCI
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  • Description
  • 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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  • Passivator for arsenic-cadmium composite contaminated soil as well as preparation method and application method thereof
  • Passivator for arsenic-cadmium composite contaminated soil as well as preparation method and application method thereof
  • Passivator for arsenic-cadmium composite contaminated soil as well as preparation method and application method thereof

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Experimental program
Comparison scheme
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 treatment, and discloses a passivation remediation agent for arsenic-cadmium composite contaminated soil, and a preparation method and applicationmethod thereof. Wormcast is utilized to enrich organic matters, adsorption and complexing immobilization of cadmium are realized, and iron (hydroxide) oxide formed by zero-valent iron in soil is utilized to generate adsorption precipitation with arsenic, so that synchronous passivation of arsenic and cadmium is realized. In addition, the wormcast can remarkably improve the soil quality, and comprehensive treatment and remediation can be conducted on the arsenic-cadmium composite contaminated soil. On one hand, zero-valent iron serving as a strong reducing agent is extremely easy to oxidize toform amorphous iron (hydroxide) oxide, and more adsorption sites are provided for arsenic and cadmium; on the other hand, the wormcast provides more organic matters for soil, increases cation exchangecapacity, increases the pH of the soil, and facilitates adsorption and immobilization of cadmium and activity reduction. Besides, the wormcast and iron are partially combined to form an iron oxide-organic carbon composite, so that soil carbon immobilization is facilitated, and the soil quality is improved.

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 Applications(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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