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Per- and polyfluoroalkyl substance (PFAS) retention by colloidal activated carbon (CAC) using dynamic column experiments

Niarchos, Georgios and Ahrens, Lutz and Berggren Kleja, Dan and Fagerlund, Fritjof (2022). Per- and polyfluoroalkyl substance (PFAS) retention by colloidal activated carbon (CAC) using dynamic column experiments. Environmental Pollution. 308 , 119667
[Research article]

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Abstract

Developing effective remediation methods for per- and polyfluoroalkyl substance (PFAS)-contaminated soils is a substantial step towards counteracting their widespread occurrence and protecting our ecosystems and drinking water sources. Stabilisation of PFAS in the subsurface using colloidal activated carbon (CAC) is an innovative, yet promising technique, requiring better understanding. In this study, dynamic soil column tests were used to assess the retardation of 10 classical perfluoroalkyl acids (PFAAs) (C-5-C-11 perfluoroalkyl carboxylic acids (PFCAs) and C-4, C-6, C-8 perfluoroalkane sulfonates (PFSAs)) as well as two alternative PFAS (6:2 and 8:2 fluorotelomer sulfonates) using CAC at 0.03% w/w, to investigate the fate and transport of PFAS under CAC treatment applications. Results showed high retardation rates for long-chain PFAS and eight times higher retardation for the CAC-treated soil compared to the non-treated reference soil for the Sigma PFAS. Replacement of shorter chain perfluorocarboxylic acids (PFCAs), such as perfluoropentanoic acid (PFPeA), by longer chained PFAS was observed, indicating competition effects. Partitioning coefficients (K-d values) were calculated for the CAC fraction at similar to 10(3)-10(5) L kg(-1) for individual PFAS, while there was a significant positive correlation (p < 0.05) between perfluorocarbon chain length and K-d. Mass balance calculations showed 37% retention of Sigma PFAS in treated soil columns after completion of the experiments and 99.7% higher retention rates than the reference soil. Redistribution and elution of CAC were noticed and quantified through organic carbon analysis, which showed a 23% loss of carbon during the experiments. These findings are a step towards better understanding the extent of CAC's potential for remediation of PFAS-contaminated soil and groundwater and the limitations of its applications.

Authors/Creators:Niarchos, Georgios and Ahrens, Lutz and Berggren Kleja, Dan and Fagerlund, Fritjof
Title:Per- and polyfluoroalkyl substance (PFAS) retention by colloidal activated carbon (CAC) using dynamic column experiments
Series Name/Journal:Environmental Pollution
Year of publishing :2022
Volume:308
Article number:119667
Number of Pages:9
Publisher:ELSEVIER SCI LTD
ISSN:0269-7491
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
Keywords:PFAS, Fluorotelomer sulfonates (FTSAs), Perfluoroalkyl acids (PFAAs), Adsorption, Transport, Colloidal activated carbon
URN:NBN:urn:nbn:se:slu:epsilon-p-118688
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-118688
Additional ID:
Type of IDID
DOI10.1016/j.envpol.2022.119667
Web of Science (WoS)000833444600009
ID Code:28714
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:01 Sep 2022 14:28
Metadata Last Modified:01 Sep 2022 14:31

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