The Water Research Foundation (WRF) found that aeration, chlorine dioxide, dissolved air flotation, coagulation, flocculation, sedimentation, granular filtration, and microfiltration were all ineffective for removing PFASs (poly- and perfluoroalkyl substances), including PFOA (perfluorooctanoic acid) and PFOS (perfluorooctanesulfonic acid). Anion exchange was moderately effective in treating PFOA, highly effective for PFOS, and failed to remove several other PFASs. Nanofiltration and reverse osmosis proved to be the most effective methods of removing even the smallest PFASs. Granular activated carbon (GAC) was shown to be adept at removing most PFASs and it may be the average utility’s best bet for PFOA and PFOS contamination.
According to the WRF, PFOA and/or PFOS occurrence has been discovered in 30 states. The WRF advised that any water treatment plant that’s near a chemical manufacturing operation or military base should be on alert for PFASs contamination.
For more information on this topic or to discuss your site needs, contact:
Rick Shoyer, LSRP