Electrochemical Oxidation for Treatment of PFAS in Contaminated Water and Fractionated Foam─A Pilot-Scale Study

Sanne J. Smith*, Melanie Lauria, Lutz Ahrens, Philip McCleaf, Patrik Hollman, Sofia Bjälkefur Seroka, Timo Hamers, Hans Peter H. Arp, Karin Wiberg

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)

Abstract

Per- and polyfluoroalkyl substances (PFAS) are persistent synthetic contaminants that are present globally in water and are exceptionally difficult to remove during conventional water treatment processes. Here, we demonstrate a practical treatment train that combines foam fractionation to concentrate PFAS from groundwater and landfill leachate, followed by an electrochemical oxidation (EO) step to degrade the PFAS. The study combined an up-scaled experimental approach with thorough characterization strategies, including target analysis, PFAS sum parameters, and toxicity testing. Additionally, the EO kinetics were successfully reproduced by a newly developed coupled numerical model. The mean total PFAS degradation over the designed treatment train reached 50%, with long- and short-chain PFAS degrading up to 86 and 31%, respectively. The treatment resulted in a decrease in the toxic potency of the water, as assessed by transthyretin binding and bacterial bioluminescence bioassays. Moreover, the extractable organofluorine concentration of the water decreased by up to 44%. Together, these findings provide an improved understanding of a promising and practical approach for on-site remediation of PFAS-contaminated water.
Original languageEnglish
Pages (from-to)1201−1211
Number of pages11
JournalACS ES&T Water
Volume3
Issue number4
DOIs
Publication statusPublished - 2023
Externally publishedYes

Keywords

  • PFAS
  • Electrochemical Oxidation
  • Boron-doped diamond
  • Per- and polyfluoroalkyl substances
  • water treatment
  • aerosols

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