Soil organic pollution and ecological risk assessment in brownfield soil from Northwest China: an integrated analysis of man-land interrelations

Frontiers in Environmental Science

Environmental Science

Biao Peng¹  Luyao Wang²  Siqi Liu²  Xiao Xie²  Jing Wang²  Yingying Sun² 

[1] Shaanxi Key Laboratory of Land Consolidation, Xi’an, China;Technology Innovation Center for Land Engineering and Human Settlements, Shaanxi Land Engineering Construction Group Co., Ltd., and Xi’an Jiaotong University, Xi’an, China;Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Xi’an, China;Institute of Land Engineering and Technology, Shaanxi Provincial Land Engineering Construction Group Ltd., Xi’an, China;Key Laboratory of Degraded and Unused Land Consolidation Engineering, The Ministry of Natural Resources, Xi’an, China;Shaanxi Provincial Land Consolidation Engineering Technology Research Center, Xi’an, China;

关键词: polluted sites;    organic pollution;    pollution level;    carcinogenic risk;    hazard quotient;   

DOI  :  10.3389/fenvs.2023.1271299

 received in 2023-08-02, accepted in 2023-08-30,  发布年份 2023

来源: Frontiers

【 摘 要 】

In general, chemical plants are accompanied by a variety of secondary production in the production process, which may have different degrees of impact on the environment. At the same time, in order to ensure the environmental safety of new urban construction land, it is necessary to conduct pollution investigation and further environmental risk assessment on potentially polluting abandoned chemical plants. This paper takes a chemical plant producing food grade fumaric acid in Northwest China as an example to investigate the pollution of organic matter in the soil in accordance with relevant standards, then analyzes the vertical pollution degree of key pollution areas. The calculation results of single factor pollution index and Nemerow pollution index show that there are 17 kinds of organic pollutants that exceed the screening value in land of Class I. Among them, benzene, 1,2,3-trichloropropane and 1,1,2,2-tetrachloroethane are most serious, and the highest exceeded the standard by 11,311 times. Moreover, the distillation zone and the reactor zone have reached the level of V pollution, and the maximum pollution depth can reach more than 6 m. The results of HERA software analysis showed that there were 18 and 10 kinds of organic pollutants with carcinogenic risk values exceeding 10−6 in the reactor and distillation area, respectively, and 25 and 11 kinds of organic pollutants with hazard quotients exceeding 1, respectively. According to relevant regulations, the contaminated areas with unacceptable regional risks must be properly repaired.

【 授权许可】

Unknown   
Copyright © 2023 Wang, Xie, Liu, Wang, Peng and Sun.