Watershed scale PFAS fate and transport model for source identification and management implications.

Autor: Rafiei V; Department of Biosystems and Agricultural Engineering, Michigan State University (MSU), USA., Nejadhashemi AP; Department of Biosystems and Agricultural Engineering, Michigan State University (MSU), USA. Electronic address: pouyan@msu.edu.
Jazyk: angličtina
Zdroj: Water research [Water Res] 2023 Jul 15; Vol. 240, pp. 120073. Date of Electronic Publication: 2023 May 16.
DOI: 10.1016/j.watres.2023.120073
Abstrakt: Developing strategic plans for the remediation and mitigation of pre- and polyfluoroalkyl substances (PFAS) in soil, groundwater, and surface water requires an understanding of the fate and transport of these chemicals on a regional scale. To fill this knowledge gap, we developed a distributed hydrogeochemical model and applied it to a large-scale watershed with various point and non-point sources of a long-chain, highly persistent PFAS compound known as perfluorooctane sulfonic acid (PFOS). The results showed that the developed model could reproduce the spatiotemporal concentration of PFOS across a large and diverse watershed. Herein, our first objective was to quantify the PFOS transport from the unsaturated zone to the groundwater and surface water via leaching, surface runoff, lateral flow, and sediment transport. The second objective was to identify factors influencing PFOS release from confirmed and suspected PFAS sites and urban and agricultural areas. The modeling results show that surface runoff played a significant role in PFOS transport, with urban areas and industrial sites being major contributors. In addition, sediment transport was found to be a notable pathway for PFOS release, particularly from sites with biosolids application. Further analysis revealed the relative importance of topography, soil water retention, and water-solid adsorption factors in determining PFOS transport dynamics at the watershed scale for better source identification and targeted management.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE