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Multiphysics Numerical Modeling of Transient Transport of PFAS
Per-and polyfluoroalkyl substances (PFAS) are a group of very persistent chemicals, labeled forever chemicals, because of their indestructibility due to their strong C-F bond. PFAS are among emerging contaminants of high concern due to their widespread contamination in the geoenvironment. PFAS are mobile, toxic, manufactured chemicals with very stable molecules and, hence, persistent in the environment. The more persistent presence of PFAS in the vadose (i.e., unsaturated) zone of soil complicates their transport due to their adsorption onto the air–water interface. The micelles formation on the air–water interface can significantly increase the retention of PFAS during its transport and turn the vadose zone into a long-term source of PFAS, slowly releasing PFAS into groundwater. This paper describes the development and testing of a one-dimensional (1D) numerical model that simulates PFAS transport, accounting for diffusion, advection, solid-phase adsorption, and air–water interface adsorption. The code is one-way coupled with a transient seepage model to account for the seepage impact on the PFAS transport, but not vice versa). After testing, the numerical model was then used to study various scenarios to evaluate the impact of solid adsorption and micelle formation on the PFAS transport.
Multiphysics Numerical Modeling of Transient Transport of PFAS
Per-and polyfluoroalkyl substances (PFAS) are a group of very persistent chemicals, labeled forever chemicals, because of their indestructibility due to their strong C-F bond. PFAS are among emerging contaminants of high concern due to their widespread contamination in the geoenvironment. PFAS are mobile, toxic, manufactured chemicals with very stable molecules and, hence, persistent in the environment. The more persistent presence of PFAS in the vadose (i.e., unsaturated) zone of soil complicates their transport due to their adsorption onto the air–water interface. The micelles formation on the air–water interface can significantly increase the retention of PFAS during its transport and turn the vadose zone into a long-term source of PFAS, slowly releasing PFAS into groundwater. This paper describes the development and testing of a one-dimensional (1D) numerical model that simulates PFAS transport, accounting for diffusion, advection, solid-phase adsorption, and air–water interface adsorption. The code is one-way coupled with a transient seepage model to account for the seepage impact on the PFAS transport, but not vice versa). After testing, the numerical model was then used to study various scenarios to evaluate the impact of solid adsorption and micelle formation on the PFAS transport.
Multiphysics Numerical Modeling of Transient Transport of PFAS
Lecture Notes in Civil Engineering
Hazarika, Hemanta (editor) / Haigh, Stuart Kenneth (editor) / Chaudhary, Babloo (editor) / Murai, Masanori (editor) / Manandhar, Suman (editor) / Farid, Arvin (author) / Iradukunda, Pierrette (author)
International symposium on Construction Resources for Environmentally Sustainable Technologies ; 2023 ; Fukuoka, Japan
2024-02-29
13 pages
Article/Chapter (Book)
Electronic Resource
English
Multiphysics Numerical Modeling of Transient Transport of PFAS
| British Library Conference Proceedings | 2022
| Wiley | 2019
| Wiley | 2019