U.S. EPA Contaminated Site Cleanup Information (CLU-IN)

U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

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Woodard, S. and M. Kuffer. | CRC Care International Cleanup Conference, 8-12 September, Adelaide, Australia, 16 slides, 2019

As part of its response to PFAS contamination from historical aqueous film-forming foam use, the Australian Department of Defence completed a detailed environmental site investigation of a >150 km2 area that included Royal Australian Air Force Base Tindal and surrounding private land. Results showed that PFAS had entered groundwater and migrated off-site toward the Katherine River. A water treatment system that combined regenerable ion exchange (IX) resins and a centralized regeneration system was installed at the Fire Training Area (contamination ≤40 µg/L) and Fire Station Area (contamination ≤50 µg/L) on the Tindal Base. Contaminated groundwater is extracted from wells located within the plumes and pumped to the treatment systems. The regenerable IX system uses a lead/lag/polish treatment train arrangement. When breakthrough is detected in the lead treatment vessel, it is removed and transported to the regeneration system, where the resin is processed using a solvent-brine blend, distillation for regenerant recovery/reuse, and super-loading to strip PFAS off the resin. The process takes ~ 6-8 hours to complete, after which the vessel is placed back into service. The regeneration process forms a highly-concentrated solids waste that minimizes PFAS waste generation at the Tindal site. More information on the resin system treatment plants:

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