Room-temperature Milling Targets PFAS Waste

A laboratory study has demonstrated that PFAS, often described as “forever chemicals”, can be destroyed in solid waste at room temperature using a mechanochemical process, offering a potential alternative to high-heat treatment methods.

Researchers at Clarkson University reported in Environmental Science & Technology Letters that they were able to break down PFAS in contaminated solids without incineration or added chemical reagents. The work remains at an early stage and has so far been tested only under laboratory conditions.

PFAS, or per- and polyfluoroalkyl substances, are widely used in industrial and consumer products for their resistance to heat, water and oil. Their strong carbon-fluorine bonds make them highly persistent in the environment and difficult to eliminate. Conventional destruction methods, including incineration and advanced oxidation, rely on high temperatures and significant energy input. These approaches have faced scrutiny over cost, emissions and long-term sustainability.

The Clarkson team used high-energy ball milling, a process in which materials are ground together in a rotating chamber. In their experiments, contaminated solids were milled with a mineral that generates small electrical charges when compressed. The researchers said these charges destabilised the carbon-fluorine bonds in PFAS molecules, leading to their destruction.

Laboratory tests showed the method was effective on PFAS embedded in spent filtration media and contaminated soils. By targeting the chemical structure directly, the process avoids the extreme temperatures typically required for thermal treatment.

Interest in lower-energy destruction technologies has grown as regulators tighten standards and place greater emphasis on verified destruction rather than containment. Investors and remediation companies are monitoring developments that could expand the available treatment options.

However, significant technical and economic questions remain. Most milling systems operate in batches, and scaling up to treat large volumes of waste would require further engineering and pilot trials. Equipment durability, throughput and operating costs would need to be assessed under commercial conditions.

For now, the findings represent a scientific advance rather than a ready industrial solution. Further validation will determine whether mechanochemical treatment can move from the laboratory to broader use in PFAS remediation.