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Arsenic-polluted soil remediation method

A restoration method, arsenic-polluted technology, applied in the field of restoration of arsenic-contaminated soil, can solve high-risk problems, achieve low price, easy process control, and low restoration cost

Active Publication Date: 2014-07-16
中节能大地(杭州)环境修复有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is simple and fast, but the pH value of the soil needs to be adjusted to 8-10, and the leaching toxicity of arsenic can only be controlled within 5mg / L, so the potential risk is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 100kg of arsenic-contaminated soil (the average soil arsenic content is 100mg / kg), add 10L of hydrogen peroxide with a mass concentration of 2%, stir evenly and let it stand for 1 hour, then add 0.5kg of magnesium oxide, and stir evenly. After the treated soil was left to stand for 1 day, the soil with a pH value of about 5-10 was obtained, and then the leaching toxicity was tested. The leaching standard was HJ557-2009. The results showed that the leaching toxicity of arsenic can be reduced by more than 95%.

Embodiment 2

[0026] Take 100kg of arsenic-contaminated soil (the average soil arsenic content is 100mg / kg), add 200g of calcium hypochlorite and appropriate amount of water, and stir well. After leaving the soil for 4 hours, add 1kg of iron powder and stir evenly. After the treated soil was left to stand for 2 days, the soil with a pH value of about 5-10 was obtained, and then the leaching toxicity was tested. The leaching standard was HJ557-2009, and the results showed that the leaching toxicity of arsenic can be reduced by more than 90%.

Embodiment 3

[0028] Take 100kg of arsenic-contaminated soil (the average soil arsenic content is 100mg / kg), add 7.5g of calcium hypochlorite and appropriate amount of water, and stir well. After leaving the soil for 2 hours, add 0.5kg of calcium hydroxide and stir evenly. After the treated soil was left to stand for 2 days, the soil with a pH value of about 5-10 was obtained, and then the leaching toxicity was tested. The leaching standard was HJ557-2009, and the results showed that the leaching toxicity of arsenic can be reduced by more than 90%.

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Abstract

The invention discloses an arsenic-polluted soil remediation method. The method comprises the following steps: adding an oxidizing agent into arsenic-polluted soil, and standing for 1-4 hours, so as to obtain arsenic-polluted soil subjected to oxidization treatment, wherein a molar ratio of the oxidizing agent to arsenic in the arsenic-polluted soil is (0.01-20):1; and adding a stabilizer and / or a precipitator into the oxidized arsenic-polluted soil, uniformly stirring, stacking and maintaining for 1-7 days, so as to finally obtain the soil with the pH value of 5-10. The method is low in remediation cost and high in operability. The main process of the method refers to the operation of adding, stirring and mixing drugs, the requirement on process control is not strict, and the process is easily controlled; the method is environmentally-friendly; by adoption of the soil remediated by adopting the method, the pH value can be controlled in a range suitable for plant growth, the soil structure is prevented from being damaged, and the secondary pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of soil treatment and relates to a method for repairing arsenic-contaminated soil. Background technique [0002] Arsenic is a non-metallic element that exists widely in nature and is carcinogenic. Various human activities, such as mining, smelting, fertilization, use of pesticides, waste water discharge and waste dumping, etc., lead to the increase of local soil arsenic content. The minimum concentration of arsenic to produce toxic effects on crops is 3mg / L, and it is also highly toxic to aquatic organisms. Arsenic and arsenic compounds can generally enter the human body through water, air and food, causing harm. my country is one of the countries most seriously affected by arsenic. During the 20 years from 1956 to 1984, there were more than 30 arsenic poisoning incidents. On December 15, 2004, World Health Organization officials announced that at least 50 million people around the world are facing th...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 张文辉吴竞宇元妙新
Owner 中节能大地(杭州)环境修复有限公司
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