In-situ remediation method for removing farmland soil arsenic

An in-situ restoration and farmland technology, applied in the restoration of contaminated soil, etc., can solve the problems that cannot fundamentally reduce the arsenic content in farmland soil, destroy the soil structure, reduce the arsenic activity, etc., and achieve large-scale promotion and simple operation , low-cost effect

Active Publication Date: 2017-06-13
环保桥(湖南)生态环境工程股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Objectively speaking, based on the concealment and refractory characteristics of soil heavy metal pollution, although the current related methods have achieved certain results, they still have great limitations.
For example, the Chinese invention patent (application number 201410480304.2) discloses a leaching method for repairing arsenic-contaminated soil by using magnetic separation, which is characterized in that the contaminated soil to be treated is pretreated, enters the leaching system, and is sequentially added to the prepared rinsing Liquid and adjuvant, after fully mixed and rinsed, passed through the powerful magnetic separation equipment in agitation mode, the arsenic pollutants were separated by magnetic separation, the remaining soil and eluent were separated by solid and liquid, and the clean soil could be directly backfilled or used for other purposes. After coagulation and sedimentation, the leaching waste liquid is reused to prepare the eluent. The sedimentation waste residue can be disposed of together with the magnetic separation waste residue. However, this method will destroy the soil structure, and it is impossible to continue planting crops after restoration, and the cost is very high.
Chinese invention patent (Application No. 201310437525.7) discloses a method for remediating rice fields with moderate to light arsenic pollution, including steps such as land preparation of contaminated soil, deep plowing, application of remedial agents, and equilibrium stabilization after application of remedial agents. Can reduce the activity of arsenic in farmland soil, but cannot fundamentally reduce the arsenic content in farmland soil
At present, there is no technology that can remove arsenic in farmland soil in situ, with low cost, simple operation, and no damage to soil structure.

Method used

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  • In-situ remediation method for removing farmland soil arsenic
  • In-situ remediation method for removing farmland soil arsenic
  • In-situ remediation method for removing farmland soil arsenic

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A 1.2-acre paddy field around a realgar mining area in Shimen, Hunan was selected, and soil samples were collected by the five-point method before treatment. The content of arsenic in soil samples was determined according to the heavy metal detection method specified in "Soil Environmental Quality Standards" (GB 15618-1995), and the total arsenic content was 654mg / kg. According to the leaching method specified in "Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007), the method specified in "Standard Test Method for Drinking Water" (GB / T5750.6-2006) is used to measure pollution The content of arsenic ions in the soil leachate, the test result of arsenic leaching toxicity is 32.5mg / L. According to "Soil Testing Part 4: Determination of Soil Bulk Density" (NY / T1121.4-2006), the soil bulk density is 1.4g / cm 3 . The weight moisture content of the soil measured by drying method is 31.25%. The repair depth is 15cm. Magnetite powde...

Embodiment 2

[0029] According to the heavy metal detection method stipulated in the "Soil Environmental Quality Standard" (GB15618-1995), the content of arsenic in the soil sample was determined according to the heavy metal detection method stipulated in the "Soil Environmental Quality Standard" (GB15618-1995), and the total arsenic content was 349mg / kg. According to the leaching method specified in "Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007), the method specified in "Standard Test Method for Drinking Water" (GB / T5750.6-2006) is used to measure pollution The content of arsenic ions in the soil leachate, the detection result of arsenic leaching toxicity is 8.9mg / L. According to "Soil Testing Part 4: Determination of Soil Bulk Density" (NY / T1121.4-2006), the soil bulk density is 1.32g / cm3 . The moisture content of soil weight measured by drying method is 35.80%. The repair depth is 20cm. Reduced iron powder (passed through a 120-mesh siev...

Embodiment 3

[0031] According to the heavy metal detection method stipulated in the "Soil Environmental Quality Standard" (GB15618-1995), the content of arsenic in the soil sample was determined according to the heavy metal detection method stipulated in the "Soil Environmental Quality Standard" (GB15618-1995), and the total arsenic content was 174mg / kg. According to the leaching method specified in "Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007), the method specified in "Standard Test Method for Drinking Water" (GB / T5750.6-2006) is used to measure pollution The content of arsenic ions in the soil leachate, the detection result of arsenic leaching toxicity is 6.3mg / L. According to "Soil Testing Part 4: Determination of Soil Bulk Density" (NY / T1121.4-2006), the soil bulk density is 1.46g / cm 3 . The moisture content of soil weight measured by drying method is 29.52%. The repair depth is 17.5cm. Using carbonized rice husk to support nano-Fe ...

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Abstract

The invention relates to the field of remediation for heavy metal pollution of soil and specifically discloses an in-situ remediation method for removing farmland soil arsenic. The in-situ remediation method comprises the following steps: applying iron passivator into soil and then forming an indissolvable matter with the arsenic in soil through complexation and coprecipitation; utilizing a stirring function of a rotary cultivator to suspend arsenic-iron compound particle in water; and utilizing a magnetic adsorption plate connected with the rotary cultivator to absorb the arsenic-iron compound, thereby achieving the purpose of removing the arsenic from farmland soil. According to the invention, the method has the effectiveness in reducing arsenic from soil; the magnetic adsorption plate is loaded on the rotary cultivator generally existing in village; the in-situ adsorption for the arsenic-iron compound can be realized following the advancing and movement of the rotary cultivator in the farmland; the arsenic is thoroughly removed from soil; the soil does not need to be dug; the planting function of the soil is not damaged.

Description

technical field [0001] The invention relates to the field of remediation of heavy metal pollution in cultivated land, and specifically discloses an in-situ remediation method capable of removing arsenic in farmland soil. Background technique [0002] Arsenic is a carcinogenic metalloid element that widely exists in nature, and its harm to human health is even more serious than cadmium. my country is a large country of arsenic mines, and it is also one of the countries in the world that suffers more and more serious arsenic pollution incidents. In recent years, arsenic pollution incidents have occurred frequently in some areas of my country, such as the arsenic pollution incident in Yangzonghai, Yunnan in 2008. Experts believe that the treatment of arsenic may take a long time, and it is more difficult to cure it. As far as farmland soil is concerned, due to the mining around the farmland and the use of arsenic-containing pesticides and insecticides, as well as the arsenic-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 唐守寅袁海伟熊琪
Owner 环保桥(湖南)生态环境工程股份有限公司
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