Method for intensively removing hexachloro-cyclohexane soprocide and dichlorodiphenyl trichloroethane in soil by zero-valent iron

A technology of zero-valent iron and BHC, which is applied in the field of zero-valent iron to strengthen the removal of BHC and DDT in soil, can solve the problems of unfavorable soil reductive dechlorination reaction, limited activity of ordinary iron powder, and difficulty in rapid degradation, etc., to achieve Fast and efficient degradation, easy operation and cost-effective effect

Inactive Publication Date: 2015-01-28
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are relatively few studies on the remediation of soil by zero-valent iron, and they mainly focus on nitrobenzenes and polychlorinated biphenyls (PCBs), and the treatment of organochlorine pesticide pollution in soil has not been reported yet.
At the same time, there are only a few reports on ZVI remediation of OCPs-contaminated soil in the world, which needs further research
[0006] For refractory organochlorine pesticides such as HCH and DDT, the effect of traditio

Method used

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  • Method for intensively removing hexachloro-cyclohexane soprocide and dichlorodiphenyl trichloroethane in soil by zero-valent iron
  • Method for intensively removing hexachloro-cyclohexane soprocide and dichlorodiphenyl trichloroethane in soil by zero-valent iron
  • Method for intensively removing hexachloro-cyclohexane soprocide and dichlorodiphenyl trichloroethane in soil by zero-valent iron

Examples

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Embodiment 1

[0031] Embodiment 1: to the processing of 666 polluted soil

[0032] In this example, the method proposed by the invention is used to treat the H66-contaminated soil in an abandoned pesticide factory in Jiangsu. The initial concentrations of α-HCH and γ-HCH in soil were 3.6mg / kg and 10.1mg / kg respectively. Weigh 15 g of commercially available 100-mesh reduced iron powder, pickle it with 0.5 mol / L sulfuric acid, immerse the iron powder in 150 mL of copper chloride solution with a Cu concentration of 2 g / L, and mix thoroughly to obtain Fe / Cu bimetallic material. Weigh 300g of HCH-contaminated soil into a 1L plastic bottle, add the prepared 15g of Fe / Cu bimetal, and stir to mix. Add 50ml of TX-100 with a concentration of 10mmol / L (mass concentration: 0.647%), and add 40ml of water. The final soil moisture content is about 25%, stir evenly. The soil pH was adjusted to 4.5 with glacial acetic acid. Cover and seal, and cultivate in a constant temperature incubator at 25°C. Sam...

Embodiment 2

[0033] Embodiment 2; To the processing of DDT polluted soil

[0034]This example uses the method proposed by the invention to treat DDT-contaminated soil in an abandoned pesticide factory site in Jiangsu. The initial concentration of the main target pollutant p,p'-DDT in the soil was 19.0mg / kg. Weigh 15 g of commercially available 100-mesh reduced iron powder, pickle it with 0.5 mol / L sulfuric acid, immerse the iron powder in 150 mL of copper chloride solution with a Cu concentration of 2 g / L, and mix thoroughly to obtain Fe / Cu bimetallic material. Weigh 300 DDT-contaminated soil into a 1L plastic bottle, add the prepared 15g Fe / Cu bimetal, stir and mix. Add 50ml of TX-100 with a concentration of 10mmol / L (mass concentration: 0.647%), and add 40ml of water. The final soil moisture content is about 25%, stir evenly. The soil pH was adjusted to 4.5 with glacial acetic acid. Cover and seal, and cultivate in a constant temperature incubator at 25°C. Sampling was carried out ...

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Abstract

The invention relates to a method for intensively removing hexachloro-cyclohexane soprocide and dichlorodiphenyl trichloroethane in soil by zero-valent iron. The method comprises the following steps: immersing reduced iron powder into a copper solution to prepare a micron Fe/Cu duplex metal material, so that the load amount of Cu is 1%; sequentially adding duplex metal and triton X-100 into the soil according to the adding amounts of 5% and 0.1%; adjusting the initial pH value of the soil to 4-5 and adjusting the water content rate of the soil to 25%-30%; and isolating oxygen and piling to react for a certain time so as to degrade and remove hexachloro-cyclohexane soprocide and dichlorodiphenyl trichloroethane in the soil. The method does not need to use complicated equipment, is simple to operate and environment-friendly; the method has economical cost and has no secondary pollution; and the method has a relatively good application prospect in the remediation of the soil polluted by low-medium concentration hexachloro-cyclohexane soprocide and dichlorodiphenyl trichloroethane.

Description

technical field [0001] The invention belongs to a method for removing organic residues in soil, in particular to a method for strengthening removal of HCH and DDT in soil by zero-valent iron. Background technique [0002] In most provinces and cities in my country, especially economically developed areas such as Jiangsu Province, organochlorine pesticides such as HCH and DDT have been produced and used in large quantities, causing serious environmental pollution. For example, in the past 30 years, the total production of DDT in China has reached 400,000 tons, which is 22% of the world's total production. In 1980 alone, the output of 666 raw powder in my country was as high as 286,400 tons. In recent years, with the implementation of the Stockholm Convention and the rapid development of urbanization, these HHC and DDT production enterprises have been closed down one after another, but a series of soil pollution problems have been left behind. [0003] Due to the extremely s...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 万金忠林玉锁张胜田龙涛周艳李群
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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