Evaluating an Innovative Ion Exchange Process for Co-Treatment of Dissolved Organic Matter and PFAS

This project proposes a comprehensive investigation of regenerable AIX as a cutting-edge solution for concurrent PFAS and TOC removal. This initiative directly addresses utilities’ urgent challenges of meeting the new maximum contaminant levels (MCLs) for PFOS and PFOA while simultaneously mitigating DBP formation.

The primary objective of this proposed project is to advance and validate a cutting-edge regenerable AIX process, SIX, that concurrently removes TOC and PFAS. SIX produces over 10 times less brine than conventional high-pressure membranes and no solid waste. The concurrent TOC removal helps DBP compliance and provides other downstream benefits (e.g., improved PFAS polishing, more stable disinfectant residual). This singular, flexible technology platform is particularly advantageous for utilities with seasonal or source-blending variability.

This project would fill a critical gap in SIX research by 1) expanding the range of water qualities on which this technology has been tested for TOC and PFAS; 2) testing additional resins; 3) evaluating TOC removal impacts on DBPs; and 4) synthesizing the new and existing data into preliminary models. 

SIX differs from other regenerable AIX approaches by leveraging more frequent, lower-strength brine regenerants, allowing for sustained resin performance, cost savings on media, and environmentally responsible waste production. Innovations include testing alternative regenerants (such as bicarbonate); validating for both PFAS compliance and distribution system DBP and disinfectant stability; and integrating the latest insights from pilot and bench studies. While an innovative treatment configuration, SIX leverages non- proprietary commercial resins for low cost and immediate scalability.