PFAS (Per- and Polyfluoroalkyl Substances)
PFAS are a large family of synthetic fluorinated chemicals valued for water- and grease-resistance but extremely persistent in the environment and linked to health effects. They are the highest-intensity contaminant topic in the water sector, driving new regulations and a large treatment market.
Why PFAS matter
The carbon–fluorine bonds that make PFAS useful also make them exceptionally resistant to degradation, so they accumulate in water, soil and organisms. Certain PFAS are associated with health effects at very low concentrations, which is why regulators have set limits in the nanograms-per-litre range — parts per trillion.
Treatment
Three capture technologies dominate: granular activated carbon, ion-exchange resins, and high-pressure membranes (RO/NF). All separate PFAS from water but concentrate them into spent media or brine, creating a residuals-management challenge.
A destruction-technology cohort — supercritical water oxidation, electrochemical oxidation, hydrothermal alkaline treatment and plasma — is moving from lab to field to break the carbon–fluorine bond, currently most viable for concentrates rather than raw water.
Regulation
The US EPA finalized enforceable drinking-water limits in 2024 (4 ng/L for PFOA and PFOS, with limits and a hazard index for several others). The EU addresses PFAS through drinking-water monitoring and a proposed broad restriction under REACH. These frameworks anchor a multi-billion-dollar global treatment market.
- [1]PFAS National Primary Drinking Water Regulation. US EPA, 2024. ↗
- [2]Per- and Polyfluoroalkyl Substances (PFAS) — restriction proposal. European Chemicals Agency (ECHA), 2023.