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Research article - Peer-reviewed, 2021

Foam fractionation removal of multiple per- and polyfluoroalkyl substances from landfill leachate

McCleaf, Philip; Kjellgren, Ylva; Ahrens, Lutz


Per- and polyfluoroalkyl substances (PFAS) are a common contaminant inmunicipal landfill leachate and are recognized as a pollutant on global scale.The present work examined foam fractionation (FF) in batch and continuousmodes as an appropriate treatment technique for PFAS removal for the landfillleachate and found stable removal efficiency of greater than 90% for PFOA(C7), PFOS (C8), PFHxS (C6), and PFHpA (C6) and 6:2 FTSA (C6). For otherPFAS such as PFNA (C8), PFPeS (C4), PFHxA (C5), PFHpS (C7), and PFBS(C4), a less stable removal between 80% and 50% was achieved while between50% and 20% removal was observed for EtFOSAA (C8), PFBA (C3), PFDA (C9),FOSA (C8), PFPeA (C4), and MeFOSAA (C8). Increased air flowrate, additionof iron (III) oxide (Fe+3) coagulant, conductivity, and greater untreated leach-ate PFAS concentration were factors resulting in increased removal efficiencyfor the majority of PFAS.


foam fractionation; landfill leachate; PFAS; removal; surface active foam fractionation; treatment techniques

Published in

Awwa Water Science
2021, volume: 3, number: 5, article number: e1238

Authors' information

McCleaf, Philip
Uppsala Water and Waste AB
Kjellgren, Ylva
No organisation
Swedish University of Agricultural Sciences, Department of Aquatic Sciences and Assessment

UKÄ Subject classification

Environmental Sciences

Publication Identifiers


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