UV Systems Push PFAS Destruction From Pilot to Reality

The US water industry is beginning to move beyond managing PFAS by containment, as an industrial-scale treatment system in Alabama demonstrated the continuous destruction of the chemicals rather than their storage or transfer.

In December, an ultraviolet treatment system ran without interruption at an industrial site in Alabama, processing more than 170,000 gallons of wastewater contaminated with per- and polyfluoroalkyl substances, commonly known as PFAS. The system reported destruction rates above 99.99 per cent, a result notable less for its precision than for the operating conditions under which it was achieved.

Unlike many earlier demonstrations, the Alabama run was not a laboratory experiment or a short-term pilot. It operated at flow rates closer to those used in industrial settings, addressing a long-standing challenge in PFAS treatment: scaling technologies that work in controlled environments to systems that can handle variable water chemistry over extended periods.

The test builds on earlier work by Claros Technologies, which in mid-2025 completed a pilot treating more than 50,000 gallons of contaminated water. That earlier project focused on technical feasibility and operational stability. The Alabama trial went further, shifting attention towards commercial optimisation rather than proof of concept.

For water utilities and manufacturers, the results carry practical implications. Established methods such as filters and resins can remove PFAS from water, but they do not destroy the compounds. Instead, they generate secondary waste that must be transported and disposed of, often at rising cost. As federal and state limits on PFAS tighten, these storage-based strategies are becoming more expensive and harder to justify over the long term.

The ultraviolet system, tested at a facility operated by Daikin, uses light energy to break PFAS molecules apart rather than concentrating them for disposal. Supporters argue that such an approach could reduce disposal costs and limit long-term environmental liability, particularly at sites that require frequent replacement of filtration media and face increasing regulatory scrutiny.

Uncertainties remain. Energy use, overall economics and performance across different types of water will influence whether the technology can be widely adopted. Other treatment methods aimed at PFAS destruction are also advancing.

Even so, the Alabama results suggest a change in direction for the sector. After decades of moving PFAS from one place to another, large-scale destruction is beginning to appear commercially achievable rather than theoretical.