PFAS Removal: Comparison of GAC/sand vs. anthracite/sand prior to post-filter GAC

Per- and Polyfluoroalkyl Substances (PFAS) are widely spread drinking water contaminants that pose developmental and reproductive health risks but can be removed by advanced treatment technologies. This project evaluates the performance of granular activated carbon (GAC) filter caps versus anthracite in dual media drinking water filters when followed by new post-filter GAC contactors for PFAS removal. Using pilot-scale studies at the Passaic Valley Water Commission’s Little Falls Water Treatment Plant, researchers will compare the two media configurations for their ability to remove PFAS, natural organic matter (NOM), manganese, and turbidity, and assess how each affects the performance and lifespan of post-filter GAC. The study will also consider operational factors such as media replacement frequency, maintenance requirements, and potential impacts on regulatory compliance like DBP formation. Results will provide utilities with practical, data-driven guidance for selecting filter media configurations that optimize PFAS control while supporting other water quality goals. Findings will be shared with utilities nationwide, including those in the “Big Six” group of North Jersey systems facing similar treatment challenges.