WCW26

Dynamic Single-Stage Reverse Osmosis (DSSRO) technology offers a transformative approach to the removal of per- and polyfluoroalkyl substances (PFAS) in drinking water treatment. PFAS are persistent synthetic chemicals that present significant public health risks due to their resistance to conventional treatment methods and their tendency to accumulate in the environment. As regulatory standards for PFAS in drinking water become increasingly stringent, utilities require advanced, reliable, and sustainable solutions.
Traditional reverse osmosis (RO) systems, while effective at removing a broad spectrum of contaminants, are often constrained by membrane fouling, high energy consumption, and the generation of large volumes of concentrated waste streams. DSSRO addresses these limitations through an innovative single-stage, semi-batch membrane array and a unique two-pump configuration. This design enables high recovery rates, often exceeding 85%, while minimizing the volume of PFAS-laden concentrate. By maintaining high crossflow and regulating flux, DSSRO reduces fouling and scaling, which in turn decreases the frequency and intensity of chemical cleaning required. This not only lowers operational costs but also extends membrane life and reduces environmental impact.
Pilot studies at multiple drinking water facilities have demonstrated DSSRO’s technical feasibility and sustainability, consistently achieving permeate PFAS levels below detection limits. The system’s high recovery rates significantly reduce concentrate output and source water demands, making it particularly attractive for utilities operating under water scarcity or strict discharge regulations. By minimizing the volume of PFAS-laden concentrate that requires disposal, DSSRO helps utilities address one of the most challenging and costly aspects of PFAS treatment, safe and responsible concentrate management. DSSRO’s adaptability allows it to be integrated into existing treatment trains, complementing other processes such as enhanced coagulation, oxidation, and ultrafiltration.
Operational data from these pilots highlight the system’s robust performance under varying water qualities and operational conditions. Automated controls, real-time monitoring, and remote data logging further enhance reliability and facilitate rapid response to changing influent characteristics. These features support utilities in meeting evolving regulatory requirements and public health goals.
This presentation will explore the technical and operational advantages of DSSRO, share pilot results, and discuss practical considerations for implementation. By advancing the application of DSSRO technology, this work aims to inspire new standards for PFAS removal and support the delivery of safe, sustainable drinking water for communities.