Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 865, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2022.161145
Keywords
Perfluorooctane sulfonate (PFOS); Air-water interface; Adsorptive bubble separation; Foam fractionation; Electrolyte; Ionic strength
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Adsorptive bubble separation techniques, such as foam fractionation, are being used to extract per- and polyfluoroalkyl substances (PFAS) from water. However, there is a lack of mathematical models for their removal. This study presents a theoretical framework for the kinetics of PFAS removal using a semi-batch foam fractionation process, considering factors such as adsorption, entrainment, and volatilization. The proposed models provide quantitative tools for process design and optimization of PFAS removal.
Adsorptive bubble separation techniques such as foam fractionation have recently been applied for the extraction of per- and polyfluoroalkyl substances (PFAS) from waters at both laboratory and operational scales. However, few authors have developed mathematical models of their removal of PFAS. This study presents a theoretical framework for the kinetics of PFAS removal from fresh and monovalent saline waters by a semi-batch foam fractionation process, by the mechanisms of adsorption, entrainment and volatilization, as a function of pertinent parameters including PFAS air-water adsorption, bubble radius, electrolyte concentration and ionic strength, PFAS volatility, and flow and geometric parameters. The freshwater model is validated for the removal of potassium perfluorooctane sulfonate (K-PFOS) using published experimental data (Meng, P. et al., Chemosphere, 2018, 203, 263-270). The proposed models provide quantitative tools for process design and the optimization of individual PFAS removal by semi-batch adsorptive bubble separation techniques such as foam fractionation.
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