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Passivator for repairing cadmium and arsenic polluted farmlands, preparation method and repair method

A remediation method and technology of passivating agent are applied in the field of contaminated soil remediation, which can solve the problems of high cost, low treatment efficiency and insufficient safety, and achieve the effect of low cost and wide source.

Inactive Publication Date: 2019-05-03
武汉瑞景环境修复工程有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no definite passivator for simultaneously repairing cadmium and arsenic pollution, and the effects of these treatment methods in the prior art are not stable, not safe enough, and costly and low in treatment efficiency

Method used

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  • Passivator for repairing cadmium and arsenic polluted farmlands, preparation method and repair method
  • Passivator for repairing cadmium and arsenic polluted farmlands, preparation method and repair method
  • Passivator for repairing cadmium and arsenic polluted farmlands, preparation method and repair method

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preparation example Construction

[0041] The invention also provides a preparation method of the passivation agent for repairing farmland polluted by cadmium and arsenic, please refer to figure 1 , The preparation method includes the following steps:

[0042] Step S210: Take straw and wood chips, dry them to a constant weight, and crush them to a 100-mesh sieve to obtain biochar;

[0043] In the concrete realization, the straw and wood chips are taken and dried to a constant weight, and then crushed to a 100-mesh sieve by a ball mill (manufacturer: Beijing Zhuo, brand: Zhuodi) to obtain biochar.

[0044] Step S220: Take active bacteria, reduced iron powder, calcium magnesium phosphate fertilizer, bentonite and the biochar, and mix them according to a preset ratio to obtain a passivating agent.

[0045] Preferably, the active bacteria, reduced iron powder, calcium magnesium phosphate fertilizer, bentonite and biochar are mixed according to the following mass percentages:

[0046] Biochar: 20%-30%; active bacteria: 10%-20...

Embodiment 1

[0064] Biochar: 22%; active bacteria: 12%; reduced iron powder: 18%; calcium magnesium phosphate fertilizer: 18%; bentonite: 30%.

Embodiment 2

[0066] Biochar: 22%; active bacteria: 13%; reduced iron powder: 17%; calcium magnesium phosphate fertilizer: 19%; bentonite: 29%.

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Abstract

The invention discloses a passivator for repairing cadmium and arsenic polluted farmlands, a preparation method and a repair method, and the passivator comprises the following components in percentageby mass: 20-30% of charcoal, 10-20% of active bacteria; 10% -20% of reduced iron powder, 10% -20% of calcium magnesium phosphate fertilizer and 20% -30% of bentonite. The invention aims to provide the passivator which is low in cost, environment-friendly and free of secondary pollution.

Description

Technical field [0001] The invention relates to the technical field of contaminated soil remediation, in particular to a passivation agent for remediating cadmium and arsenic contaminated farmland, a preparation method and a remediation method. Background technique [0002] With the rapid development of industry and agriculture and the continuous acceleration of the urban process, heavy metals discharged from industry, agriculture and daily life continue to increase, and soil pollution by heavy metals is also increasingly serious. Soil is an important natural resource for the survival and development of human beings and the foundation of the entire terrestrial ecosystem, and it is also one of the important environmental elements. The migration and transformation of heavy metals in the soil not only endanger the growth of crops, but also endanger the health of animals and humans. According to statistics from the Ministry of Agriculture of my country, the land contaminated by heav...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08C09K101/00
Inventor 李玲董琴史文梅陈晨
Owner 武汉瑞景环境修复工程有限公司
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