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Method for removing hydrochloric ether contained in soil through chemical oxidation method

A technology of chemical oxidation and chlorinated hydrocarbons, applied in the field of soil remediation, can solve the problems of poor treatment effect of chlorinated hydrocarbons, and achieve the effects of avoiding soil component interference, facilitating subsequent treatment, and low price

Inactive Publication Date: 2013-09-11
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complexity of soil chemical composition, various organic substances, inorganic minerals, and reducing substances contained in it will preferentially consume oxidants. At the same time, the direction and range of migration of oxidants in the subsurface soil are not directional, making it possible to directly add them separately. Oxidants are less effective in treating chlorinated hydrocarbons

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Be 100mg / kg polluted soil matrix (pre-add 50gFe in the trichlorethylene pollution concentration 3 o 4 / kg soil (dry weight)), add 5L concentration of 127mM Na 2 S 2 o 8 The solution was fully mixed and stirred, while the reaction temperature was controlled at 20°C, and the reaction time was 48 hours. The soil samples were extracted at 1, 3, 6, 9, 12, 24, and 48 hours respectively, and the concentration of trichlorethylene was analyzed by gas chromatography. The result The removal rate of the trichlorethylene treated by the process of the invention reaches 99% after 48 hours.

Embodiment 2

[0037] Be 100mg / kg polluted soil substrate (pre-adding 100gFe 3 o 4 / kg soil (dry weight)), add 5L concentration of 127mM Na 2 S 2 o 8 The solution was fully mixed and stirred, while the reaction temperature was controlled at 20°C, and the reaction time was 48 hours. The soil samples were extracted at 1, 3, 6, 9, 12, 24, and 48 hours respectively, and the concentration of trichlorethylene was analyzed by gas chromatography. The result The removal rate of trichlorethylene treated by the process of the invention reaches 99.9% in about 48 hours.

Embodiment 3

[0039] Be 100mg / kg polluted soil matrix (pre-add 50gFe in the trichlorethylene pollution concentration 3 o 4 / kg soil (dry weight)), add 4L concentration of 254mM Na 2 S 2 o 8 The solution was fully mixed and stirred, while the reaction temperature was controlled at 20°C, and the reaction time was 48 hours. Sampling and extraction were carried out at 1, 3, 6, 9, 12, 24, and 48 hours respectively, and the concentration of trichlorethylene was analyzed by gas chromatography. The removal rate of the trichlorethylene treated by the process of the invention reaches 90% in about 48 hours.

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Abstract

The invention relates to a method for removing hydrochloric ether contained in soil in the restoring and treating process of hydrochloric ether contaminated soil, and belongs to the technical field of environment treatment. The method mainly removes certain hydrochloric ether contaminants which exist in the soil through the oxidation action of sodium persulfate (Na2S2O8). The method can be used for treating the hydrochloric ether contained in the soil by carrying out out-phase activation on an oxidizing agent by simultaneously adding ferroferric oxide powder under the condition of ensuring the existence of the sodium persulfate in a treatment process, thereby accelerating the chemical oxidation process and enhancing the treatment effect. The method disclosed by the invention is simple, easy to operate and outstanding in effect. According to the invention, the sodium persulfate as a green oxidizing agent is stable in chemical property and higher in oxidization capacity, the hydrochloric ether achieves high removal efficiency, and the removal rate of trichloroethylene in the soil achieves 99%. The method disclosed by the invention has the advantages of fast dechlorination on the hydrochloric ether contaminated soil, less destruction on a soil structure, no toxicity of products, convenience for subsequent utilization and low expense.

Description

【Technical field】 [0001] The invention relates to the technical field of soil remediation, in particular to a chemical oxidation method for removing chlorinated hydrocarbons in polluted soil. 【Background technique】 [0002] Soil is at the center of the natural environment, and it bears pollutants from all sides in the environment. Chlorinated hydrocarbons are frequently detected in polluted sites around the world, and most of them have carcinogenic effects or potential "three-cause" (carcinogenic, teratogenic, mutagenic) hazards. Among the 25 pollutants with the highest detection rate, 10 The first is chlorinated organic compounds, such as trichloroethylene, 1,1,1-trichloroethane, tetrachloroethylene and chloroform. Once the soil is polluted, it will not only directly affect the soil ecological environment but also threaten the quality of groundwater, which is one of the important domestic water sources in our country. [0003] In view of the widespread contamination of so...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 吕树光阮晓昕顾小钢吴小亮臧学轲缪周伟徐旻辉邱兆富隋倩
Owner EAST CHINA UNIV OF SCI & TECH
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