DISTRIBUTION CHARACTERISTICS AND RISK ASSESSMENT OF SOIL POLLUTANTS IN AN EXPLOSION SITE OF A CHEMICAL PLANT

LI Anna; WANG Hui; LIU Qiangnan; LI Taiping

doi:10.13205/j.hjgc.202211027

Volume 40 Issue 11

Nov. 2022

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LI Anna, WANG Hui, LIU Qiangnan, LI Taiping. DISTRIBUTION CHARACTERISTICS AND RISK ASSESSMENT OF SOIL POLLUTANTS IN AN EXPLOSION SITE OF A CHEMICAL PLANT[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(11): 189-198. doi: 10.13205/j.hjgc.202211027

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LI Anna, WANG Hui, LIU Qiangnan, LI Taiping. DISTRIBUTION CHARACTERISTICS AND RISK ASSESSMENT OF SOIL POLLUTANTS IN AN EXPLOSION SITE OF A CHEMICAL PLANT[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(11): 189-198. doi: 10.13205/j.hjgc.202211027

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DISTRIBUTION CHARACTERISTICS AND RISK ASSESSMENT OF SOIL POLLUTANTS IN AN EXPLOSION SITE OF A CHEMICAL PLANT

doi: 10.13205/j.hjgc.202211027

1. Department of Environment Engineering, School of Chemical Engineering & Pharmacy, Henan University of Science and Technology, Luoyang 471023, China;
2. Beijing Construction Engineering Environmental Remediation Co., Ltd, Beijing 100045, China

Received Date: 2021-12-31
Available Online: 2023-03-24

Abstract

Abstract

With an abandoned land area after an explosion accident in an organic chemical plant as the research subject, the soils at different depths were evaluated using the single-factor pollution index, and comprehensive pollution index, as well as the risk assessment model recommended in the Technical Guidelines for Soil Pollution Risk Assessment of Construction Land, HJ 25.3-2019. Further, we evaluated the pollution degree and health risk of the site, and proposed risk control values of pollutants based on human health risk assessment. The results showed that excessive pollutants in the soil comprised 1,1,2-trichloroethane, chlorobenzene and 1,4-dichlorobenzene, which were mainly concentrated in the central and northwest subsoil (2 to 8 meters deep) of the study area. The results of the single-factor pollution index assessment showed that these three organic compounds displayed different degrees of pollution in the subsoil, with chlorobenzene as the most serious pollutant. The results of the comprehensive pollution index assessment showed that the topsoil was not polluted, whereas the comprehensive pollution degree of some areas in the subsoil was severe. The health risk assessment results showed that the cancer risks and hazard quotient in the central and northwest subsoil of the study area exceeded the acceptable threshold. The primary exposure risk came from the indoor inhalation pathway of gaseous pollutants, such as chlorobenzene and 1,4-dichlorobene. The calculation results of the risk control value showed that the risk control value of pollutants was far lower than the maximum detection value. When the risk control value calculated by layers was selected as the repair target value, the amount of pollution could be effectively reduced.
- soil,
- pollution assessment,
- spatial distribution,
- health risk assessment,
- organic substance

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References(47)

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