Passivator used for in-situ repairing of polluted farmland soil and processing method

An in-situ remediation and arsenic-contaminated technology, which is applied in the field of arsenic-contaminated soil remediation, can solve the problems of low cost of chemical in-situ passivation, affecting food quantity security, and small biomass, and achieves simple and easy remediation measures, Fast restoration process and effects from a wide range of sources

Inactive Publication Date: 2018-04-06
湖北农谷畅响土壤修复科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] A comprehensive analysis of the above repair technologies shows that engineering measures are easy to operate, but cost high and are only applicable in a small area; agronomic control measures are simple to operate, low in cost, and relatively mature in technology, but the disadvantage is that the repair effect is limited, and they are only suitable for heavy metals in farmland. and mildly polluted remediation, in which the adjustment of planting structure may lead to difficulties for farmers to accept and affect

Method used

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  • Passivator used for in-situ repairing of polluted farmland soil and processing method
  • Passivator used for in-situ repairing of polluted farmland soil and processing method

Examples

Experimental program
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Embodiment 1

[0028] The test soil was collected from the farmland near the mining area of ​​Huji Town, Zhongxiang City, Hubei Province. The total arsenic content in the soil was tested to be 100 mg / kg, which was higher than the third-level standard of the "Soil Environmental Quality Standard" (GB15618-1995).

[0029] Passivator of the present invention comprises following material:

[0030] Ferric chloride 10 kg

[0031] Biochar 30 kg

[0032] slaked lime 20 kg

[0033] Naki Bentonite 40 kg

[0034] The arsenic pollution passivator for farmland soil is obtained by mixing slaked lime, biochar, and sodium bentonite according to the mass ratio of raw materials, stirring evenly, and then mixing with ferric chloride in a corresponding mass ratio, and stirring evenly.

[0035] The steps of the method for repairing arsenic-contaminated soil by the heavy metal passivator of the present invention:

[0036] (1) Detection According to the solid waste "leaching toxicity leaching method sulfuric ac...

Embodiment 2

[0042] The test soil was collected from the farmland near the mining area of ​​Huji Town, Zhongxiang City, Hubei Province. The total arsenic content in the soil was tested to be 100 mg / kg, which was higher than the third-level standard of the "Soil Environmental Quality Standard" (GB15618-1995).

[0043] Passivator of the present invention comprises following material:

[0044] Ferrous sulfate 25kg

[0045] Biochar 20 kg

[0046] Slaked lime 30 kg

[0047] Sodium bentonite 15kg

[0048] The arsenic pollution passivator for farmland soil is obtained by mixing slaked lime, biochar, and sodium bentonite according to the mass ratio of raw materials, stirring evenly, and then mixing with ferrous sulfate in a corresponding mass ratio, and stirring evenly.

[0049] The steps of the method for repairing arsenic-contaminated soil by the heavy metal passivator of the present invention:

[0050](1) Detection According to the solid waste "Leaching Toxicity Leaching Method Sulfuric Aci...

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Abstract

The invention discloses a passivator used for in-situ repairing of polluted farmland soil. The passivator comprises raw materials including an iron-based compound, lime charcoal and bentonite. The passivator includes, by weight, 8-30 parts of the iron-based compound, 10-30 parts of the lime charcoal and 20-40 parts of the bentonite. The passivator has the beneficial effects that the sources of reagents adopted in the passivator used for repairing arsenic polluted soil are wide, the cost is low, secondary pollution cannot be caused on soil, a synergistic effect is achieved among different materials, the repairing efficiency is high, and the effect is obvious. When in-situ repairing is conducted on the arsenic polluted soil, the surface of the soil is covered with a repairing material, the 0cm-30 cm surface layer of the soil is evenly mixed with the repairing material in a plough manner, water is added for one week of curing, the leaching concentration of the heavy metal arsenic in therepaired farmland soil is detected, the soil is qualified when the leaching concentration is smaller than the III standard of the Quality Standard for Underground Water (GB/T14848-93), and if the leaching concentration cannot reach the standard, the curing time is prolonged.

Description

Technical field [0001] The invention relates to the field of restoration of arsenic-contaminated soil, in particular to a passivator for in-situ restoration of arsenic-contaminated farmland soil. Background technique [0002] Arsenic exists widely in nature, and hundreds of arsenic minerals have been discovered. Elemental arsenic is non-toxic, but arsenic compounds are toxic. Accumulation of arsenic in the body is toxic to the gastrointestinal tract, liver, kidneys, cardiovascular system, nervous system, and respiratory system, and may cause skin cancer. With the mining and smelting of arsenic-containing metal minerals, the combustion of fossil fuels, the use of arsenic-containing chemicals and pesticides, wood preservation, and the discharge and illegal dumping of industrial wastewater, the concentration of arsenic in the soil is increasing day by day, causing worldwide Different degrees of soil arsenic pollution. Due to the complexity of formation, long-term accumulatio...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 高鷃铭冯亮张尽睛
Owner 湖北农谷畅响土壤修复科技股份有限公司
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