Breakthrough membrane filters 94% of toxic PFAS from water

Scientists at the University of Bath have created a new membrane to filter harmful PFAS chemicals from water. The bio-based polymer material offers a potential solution to a long-standing environmental challenge. Early tests show it can remove over 94% of PFOA, one of the most common PFAS compounds. The membrane is made from ultra-fine polymer fibres sourced from renewable materials. When placed in water, it absorbs moisture and restructures itself to trap PFAS molecules. Within the first hour, the process captures half of the pollutant load.

Unlike traditional methods that destroy PFAS, this approach focuses on capture and reuse. The membrane can be heated to release trapped contaminants, allowing it to be recycled while recovering up to 93% of its original efficiency. Researchers are now testing the technology outside the lab to assess real-world performance. The development comes as stricter PFAS regulations approach. From January 2026, the EU's Drinking Water Directive will enforce limits of 0.5 µg/L for total PFAS and 0.1 µg/L for 20 key substances. Water suppliers exceeding these thresholds will face mandatory actions, including source shutdowns and public alerts.

If scaled successfully, the membrane could provide a more sustainable way to meet PFAS treatment requirements. Its ability to capture and release contaminants reduces waste compared to existing methods. The technology may help water providers comply with tightening regulations while lowering operational emissions.