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TREATMENT OF AQUEOUS FILM-FORMING FOAM BY HEAT-ACTIVATED PERSULFATE UNDER CONDITIONS REPRESENTATIVE OF IN SITU CHEMICAL OXIDATION
Bruton, T.A. and D.L. Sedlak.
Environmental Science & Technology 51(23):13878-13885(2017)

To investigate the potential for remediating AFFF contamination in groundwater with heat-activated persulfate, oxidation of poly- and perfluoroalkyl substances and the generation of transformation products was evaluated under well-controlled conditions. Fluorotelomer- and perfluoroalkyl sulfonamide-based polyfluorinated compounds were transformed to perfluorinated carboxylic acids, which underwent further degradation under acidic conditions produced after persulfate decomposed. The presence of aquifer sediments decreased the efficiency of the remedial process but did not alter the transformation pathways. At high concentrations, the presence of organic solvents, such as those present in AFFF formulations, inhibited transformation of a representative perfluorinated compound, PFOA. Heat-activated persulfate did not transform PFOS or PFHxS under any conditions. http://pubs.acs.org/doi/pdf/10.1021/acs.est.7b03969



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