KEMRON

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PFAS Treatability Study

KEMRON’s Applied Technologies Group conducted an ex-situ thermal remediation bench-scale treatability study on soil impacted with Perfluorinated Compounds (PFCs). Common PFCs include perfluorooctanoic acid (PFOA), perfluorooctanesulfonic acid (PFOS), perfluorononanoic acid (PFNA), perfluorobutanesulfonic acid (PFBS), perfluorooctanesulfonyl fluoride (POSF), perfluorooctanesulfonamide (PFOSA), FC-75 (a 3M Fluorinert liquid), and perfluorinated cyclic ether (PFCE). These compounds are used in various applications, such as Teflon production, semiconductor manufacturing, Scotchgard formulations, and fire-fighting foams.

The study aimed to determine the treatment temperatures capable of thermally destroying PFCs in highly organic soil. The test material consisted of soil composted at different intervals: 3, 6, 12, and 18 months. Each sample was subjected to thermal treatment at three target temperatures and one retention time. The materials were initially heated to 100°C to remove all moisture before being treated at 200°C, 398°C, and 1,100°C for approximately 15 minutes. Constant temperature monitoring was performed throughout the treatment process. All vapors generated were passed through an activated carbon off-gas treatment system before release into the atmosphere.

Although KEMRON was not provided with the PFC analysis results of the treated materials, discussions with the client indicated that treatment temperatures exceeding 1,000°C successfully reduced total PFC concentrations. This study highlights KEMRON’s capability in evaluating and applying thermal remediation techniques to address complex soil contamination issues.

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