Analysis of soil pollution and chemical oxidation remediation in relocated chemical sites

doi:10.14088/j.cnki.issn0439-8114.2020.07.029

Abstract

Abstract: Aiming at the pollution problem of the site left after the relocation of chemical companies, a contaminated soil at a relocated chemical site in southern Jiangsu was taken as the research object. The status quo analysis determined that the target pollutants were polycyclic aromatic hydrocarbons, volatile organic compounds and chlorobenzenes. According to the characteristics of organic compound polluted sites, 1-naphthylamine, 1,2-dichlorobenzene and 1,4-dichlorobenzene were used as main pollutants to remove the pollutants, and the site soil was treated with electro-oxidation in situ remediation technology. The results show that the water-soil mass ratio, electro-oxidation time, and current intensity are the main influencing factors for electro-oxidation repair. When the mass ratio of water and soil is 2∶1, the current strength of the oxidation electrode is 300 A, and the electrooxidation time is 15 min, the removal rate of the main pollutants in the soil, 1-naphthylamine, 1,2-dichlorobenzene, and 1,4-dichlorobenzene reaches more than 90%; The heavier the organic compound polluted soil, the higher the removal rate within the same electro-oxidation time interval, indicating that the method is suitable for treating soils with higher pollutant concentrations. It is estimated that it will cost about 70.9 yuan to treat 1 t of soil. This study can provide technical process parameters and theoretical basis for the remediation of organic compound contaminated sites in this chemical enterprise, and can provide technical choices and process design references for the same type of contaminated site remediation.

Key words: chemical sites, organic pollution, status quo analysis, electrooxidative remediation

CLC Number:

ZHOU Huan, HU Lin-chao, HU Min, ZHU Lei-ming, MAO Lin-qiang, ZHANG Wen-yi. Analysis of soil pollution and chemical oxidation remediation in relocated chemical sites[J]. HUBEI AGRICULTURAL SCIENCES, 2020, 59(7): 142-146.

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