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Numerical modeling of PFAS movement through the vadose zone: Influence of plant water uptake and soil organic carbon distribution
Abstract
In this study, we investigated the effects of soil organic carbon (SOC) distribution and water uptake by plant roots on PFAS movement in the vadose zone with a deep groundwater table under temperate, humid climate conditions. Two series of numerical simulations were performed with the HYDRUS computer code, representing the leaching of historical PFOS contamination and the infiltration of water contaminated with PFOA, respectively. We considered soil profiles with three distributions of SOC (no SOC, realistic SOC distribution decreasing with depth, and uniform SOC equal to the content measured in topsoil), three root distributions (bare soil, grassland, and forest), and three soil textures (sand, sandy loam, and loam). The SOC distribution had a profound impact on the velocity of PFOS movement. The apparent retardation factor for realistic SOC distribution was twice as large as for the scenario with no SOC and more than three times smaller than for the scenario with uniformly high SOC content. We also showed that the root distribution in soil profoundly impacts the simulations of PFAS migration through soil. Including the root zone significantly slows down the movement of PFAS, primarily due to increased evapotranspiration and reduced downward water flux. Another effect of water uptake by plant roots is an increase of PFAS concentrations in soil water (evapo-concentration). The evapo-concentration and the slowdown of PFAS movement due to root water uptake are more significant in fine-textured soils than in sand.
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Authors (5)
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Jirka Simunek Professor
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- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.scitotenv.2024.173252
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- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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SCIENCE OF THE TOTAL ENVIRONMENT
no. 935,
ISSN: 0048-9697 - Language:
- English
- Publication year:
- 2024
- Bibliographic description:
- Biesek B., Szymkiewicz A., Simunek J., Gumuła-Kawęcka A., Jaworska-Szulc B.: Numerical modeling of PFAS movement through the vadose zone: Influence of plant water uptake and soil organic carbon distribution// SCIENCE OF THE TOTAL ENVIRONMENT -, (2024), s.173252-
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.scitotenv.2024.173252
- Sources of funding:
-
- Free publication
- Verified by:
- Gdańsk University of Technology
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