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英亚体育平台-官方网站 >> 學術報告
“多孔介質中流動與遷移現象研究前沿:從微觀到宏觀尺度”系列學術報告之三 Mathematical Modeling of the Long-Term Retention and Leaching of PFAS in the Vadose Zone

發布日期:2020-09-23訪問次數:字號:[ ]

報告人:Dr. Bo Guo, University of Arizona

報告時間:2020年10月21日(星期三)10:30–12:00

ZOOM ID:985 0576 8242

報告人簡歷:Dr. Bo Guo is an Assistant Professor in Hydrology and Atmospheric Sciences and Affiliated Faculty in Applied Math at the University of Arizona (U of A). Before he joined the U of A, Dr. Guo was a postdoc in the Department of Energy Resources Engineering at Stanford University. Dr. Guo received his PhD in Civil and Environmental Engineering at Princeton University in 2016 and B.S. (with highest honor) in Hydraulic Engineering from Tsinghua University in China in 2011.

Dr. Guo’s research aims to: i) advance our fundamental understanding of fluid flow and transport processes in porous materials at microscale (i.e., pore scale) by developing computational models that explicitly represent the pore structures and the physical and chemical processes, and ii) then take the microscale understanding and develop predictive computational models at field scale (often involves model reduction via upscaling or multiscale formulations) to address practical engineering problems for energy and environmental systems in the subsurface including contaminant transport in soil and groundwater especially emerging contaminants such as PFAS, shale gas/oil production, and geological CO2 storage.

內容簡介:Per- and polyfluoroalkyl substances (PFAS) are emerging contaminants of critical concern. As surfactants, PFAS tend to accumulate at air-water interfaces and may stay in the vadose zone for long times before contaminating groundwater. The primary factors that control the timescale of retention for PFAS in the vadose zone remain poorly understood, especially under dynamic changes of air-water interfaces driven by time-dependent infiltration. We present the first mathematical model that accounts for surfactant-induced flow and nonlinear rate-limited solid-phase and air-water interfacial adsorption under transient variably saturated flow. We apply the model to simulate the retention and leaching behaviors of a group of six dominant PFAS (including both short- and long-chain compounds) in the vadose zone at a model fire-training area site impacted by aqueous film-forming foam (AFFF). Real rainfall infiltration datasets obtained from two areas under humid and semi-arid meteorological conditions are employed. Our simulation results show that the adsorption at the air-water interfaces, amplified by the low water content due to gravity drainage, has much greater impact on the retention of the long-chain PFAS than that of their short-chain counterparts. The long-chain PFAS (such as PFOS) are strongly retained in the shallow vadose zone near the land surface even several decades after PFAS-release contamination events stopped. Additionally, most of the long-chain PFAS in the vadose zone are adsorbed at air-water interfaces with only a few percent staying in the aqueous phase. Our findings clearly demonstrate that 1) vadose zones are going to be long-term sources zones of long-chain PFAS to groundwater, and 2) the soil concentrations of long-chain PFAS in source zones are likely to be orders of magnitude higher than those in the groundwater underneath. These findings are directly supported by recent field observations at hundreds of AFFF-impacted sites.

聯系人:熊云武 副教授

中國農業大學水利與土木工程學院

E-mail: yxiong@cau.edu.cn






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