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SORPTION OF POLY- AND PERFLUOROALKYL SUBSTANCES (PFASS) RELEVANT TO AQUEOUS FILM-FORMING FOAM (AFFF)-IMPACTED GROUNDWATER BY BIOCHARS AND ACTIVATED CARBON
Xiao, X., B.A. Ulrich, B. Chen, and C.P. Higgins.
Environmental Science & Technology 51(11):6342-6351(2017)

Researchers compared the removal of 30 per- and polyfluoroalkyl substances (PFASs) from AFFF-impacted drinking water using granular activated carbon (GAC). The approach combined lab batch experiments and modeling. The model predicted that nearly all of the recently discovered polyfluorinated chemicals and PFOS-like PFASs detected in the water would break through GAC systems before PFOS or PFOA. The model breakthrough results were used to evaluate a simplified approach to predicting PFAS removal by GAC using compound-specific retention times on a C18 column. Overall results suggest that GAC systems operated to remove PFOA and PFOS from AFFF-impacted water likely achieve poor removal of many unmonitored PFASs of unknown toxicity. This paper is Open Access at https://pubs.acs.org/doi/abs/10.1021/acs.est.7b00970.



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