Title: Rejection of Perfluorooctanoic Acid (Pfoa) and Perfluorooctane Sulfonate (Pfos) by Severely Chlorine Damaged Ro Membranes with Different Salt Rejection Ratios
Abstract:Removal of per- and polyfluoroalkyl substances (PFASs) from water use cycles has now become more important and urgent task than ever before due to their wide spread in water environment and associated...Removal of per- and polyfluoroalkyl substances (PFASs) from water use cycles has now become more important and urgent task than ever before due to their wide spread in water environment and associated adverse health effects. In this study, we investigated the chlorine treated reverse osmosis (RO) membranes ( Dow FILMTEC ™ SW30HR) with five different salt rejection ratios from 12% to 66% for their rejection of the two most typical PFASs, perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS), in the lab-scale cross-flow filtration tests. The damaged membranes were further characterized for their contact angle and zeta potential, and elemental composition was analyzed by X-ray photoelectron spectroscopy. The filtration tests demonstrated that the damaged SW30HR membranes with 39~66% salt rejection ratios achieved over 80% rejection of both PFOA and PFOS, which was comparable or even superior performance to that previously reported for the nanofiltration (NF) membranes. Characterization of membranes suggested that electrostatic repulsion and size exclusion synergistically worked to achieve the efficient rejection of PFOA and PFOS in the damaged SW30HR membranes. This study first presented a potential that the used RO membranes would be reused in the treatment of PFASs contaminated water, which would contribute waste reduction and material saving.Read More
Publication Year: 2022
Publication Date: 2022-01-01
Language: en
Type: article
Indexed In: ['crossref']
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