Microbe from New Jersey wetlands chomps PFAS

Per- and polyfluoroalkyl substances (PFAS) are building up in the environment, and scientists are becoming concerned. These substances, ubiquitous as water-repellent or nonstick additives in many consumer products, are persistent and have been accumulating in organisms throughout the food chain over many years. Now, researchers reporting in the ACS journal Environmental Science & Technology have identified bacteria from a New Jersey wetland that, surprisingly, can break carbon-fluorine bonds and degrade PFAS.

Under appropriate environmental conditions, A6 and the Feammox process could biodegrade PFAS in contaminated soil and groundwater

To find out, the researchers grew cultures of A6 in iron- and ammonium-rich medium and added one of two PFAS: perfluorooctanoic acid (PFOA) or perfluorooctane sulfonate (PFOS). The team found that A6 used the Feammox reaction to transfer electrons from ammonium or hydrogen gas to PFAS, removing the fluoride atoms and rendering the substances harmless. As a result, over a 100-day period, the microbes degraded up to 60% of the PFOA and 50% of the PFOS added to the cultures. These results indicate that under appropriate environmental conditions, A6 and the Feammox process could biodegrade PFAS in contaminated soil and groundwater, the researchers say. The authors acknowledge funding from the Helen Shipley Hunt Fund. “Defluorination of Perfluorooctanoic Acid (PFOA) and Perfluorooctane Sulfonate (PFOS) by Acidimicrobium sp. Strain A6”