A screening model for predicting the potential of soil colloids-enhanced leaching of hydrophobic organic contaminants to groundwater at contaminated sites  

作　　者：Lin Duan Jiahuan Liu Jing Wang Chuanjia Jiang Tong Zhang Wei Chen 

机构地区：[1]College of Environmental Science and Engineering,Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria,Tianjin Key Laboratory of Environmental Remediation and Pollution Control,Nankai University,Tianjin 300350,China

出　　处：《Journal of Environmental Sciences》2025年第4期309-317,共9页环境科学学报(英文版)

基　　金：supported by the National Key Research and Development Program of China(No.2019YFC1804202);the National Natural Science Foundation of China(Nos.22020102004 and 22125603);Tianjin Municipal Science and Technology Bureau(No.21JCZDJC00280);the Fundamental Research Funds for the Central Universities,and the Ministry of Education of China(No.T2017002).

摘　　要：Modeling the fate and transport of organic pollutants at contaminated sites is critical for risk assessment and management practices,such as establishing realistic cleanup standards or remediation endpoints.Against the conventional wisdom that highly hydrophobic persistent organic pollutants(POPs)(e.g.,polybrominated diphenyl ethers and polycyclic aromatic hydrocarbons)in surface soils are essentially immobile,mounting evidence has demonstrated the potential of these contaminants leaching into the groundwater,due to enhanced transport by soil colloids.Here,we develop a Colloids-Enhanced Transport(CET)model,which can be used as a simple screening tool to predict the leaching potential of POPs into groundwater,as mediated by soil colloids.The CET model incorporates several processes,including the release of POPs-bearing colloids into the porewater,the vertical transport of colloids and associated POPs in the vadose zone,themixing of POPs-containing soil leachate with groundwater,and the migration of POPs-bearing colloids in saturated zone.Thus,using parameters that can be easily obtained(e.g.,annual rainfall,soil type,and common hydrogeological properties of the subsurface porous media),the CET model can estimate the concentrations of POPs in the saturated zone from the observed POPs concentrations in surface or shallow subsurface zones.The CET model can also be used to derive soil quality standards or cleanup endpoints by back-calculating soil concentrations based on groundwater protection limits.

关 键 词：COLLOIDS TRANSPORT Persistent organic pollutants Vadose zone Saturated zone 

分 类 号：P64[天文地球—地质矿产勘探]