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THERMAL DESORPTION AS A HIGH REMOVAL REMEDIATION TECHNIQUE FOR SOILS CONTAMINATED WITH PER- AND POLYFLUOROALKYL SUBSTANCES (PFASS)
Sorengard, M., A-S. Lindh, and L. Ahrens. | PLoS ONE 15(6):e0234476(2020)

Two fortified soils (∑9PFAS≈4 mg/kg) and one field-contaminated soil (∑9PFAS≈0.025 mg/kg) were thermally treated for 75 minutes at temperatures ranging from 150-550°C. At 350°C, ∑9PFAS soil concentrations decreased by an average of 43% (fortified soils) and 79% (field-contaminated soils). At 450°C, >99% of PFAS were removed from the fortified soils, while at 550°C the fraction removed ranged between 71 and 99% for the field-contaminated soil. In the field-contaminated soil, PFAS classes with functional groups of sulfonates (PFSAs) and sulfonamides (FOSAs) showed higher removal than PFCAs. While thermal desorption has the potential to remove a wide variety of PFASs from soil, more studies are needed to investigate the cost-effectiveness, creation of transformation products, and air-phase vacuum filtration techniques. https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0234476&type=printable



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