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Electrokinetic remediation for removal of per- and polyfluoroalkyl substances (PFASs) from contaminated soil

Niarchos, Georgios and Sörengård, Mattias and Fagerlund, Fritjof and Ahrens, Lutz (2022). Electrokinetic remediation for removal of per- and polyfluoroalkyl substances (PFASs) from contaminated soil. Chemosphere. 291 :Part 3 , 133041
[Research article]

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Abstract

Uncontrolled use and disposal of per-and polyfluoroalkyl substances (PFASs) in recent decades has resulted in extensive soil and groundwater contamination, necessitating counteraction. Electrokinetic remediation (EKR) offers a promising approach to in-situ soil remediation. Two novel modifications to conventional EKR were tested for the first time in a laboratory-scale study, to explore the capacity of EKR for PFAS removal. The first modi-fication was a two-compartment setup designed for PFAS extraction from soil to an electrolyte-filled chamber. The second was a single-compartment setup designed to transport and confine contaminants in a chamber filled with granular activated carbon (GAC), thus, combining extraction with stabilisation. Electromigration varied for individual compounds, based mainly on perfluorocarbon chain length and functional group. The results indicated up to 89% concentration and extraction of n-ary sumation PFASs for the two-compartment setup, with removal efficiency reaching 99% for individual PFASs with C <= 6. Removed PFASs were concentrated adjacent to the anode at the anion exchange membrane, while short-chain compounds were extracted in the anolyte. The single-compartment setup achieved 75% extraction and accumulation of n-ary sumation PFASs in GAC. This demonstrates, for the first time, good effectiveness of coupling EKR with AC stabilisation for PFAS removal from soil. Perfluorocarbon chain length was a dominant factor affecting treatment efficiency in both setups, with very high removal rates for short-chain PFASs.

Authors/Creators:Niarchos, Georgios and Sörengård, Mattias and Fagerlund, Fritjof and Ahrens, Lutz
Title:Electrokinetic remediation for removal of per- and polyfluoroalkyl substances (PFASs) from contaminated soil
Series Name/Journal:Chemosphere
Year of publishing :2022
Volume:291
Number:Part 3
Article number:133041
Number of Pages:8
Publisher:PERGAMON-ELSEVIER SCIENCE LTD
ISSN:0045-6535
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 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Keywords:Electrokinetics, Treatment, PFAS, Adsorption, Soil, Groundwater
URN:NBN:urn:nbn:se:slu:epsilon-p-116404
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-116404
Additional ID:
Type of IDID
DOI10.1016/j.chemosphere.2021.133041
Web of Science (WoS)000758280300008
ID Code:27338
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:18 Mar 2022 11:25
Metadata Last Modified:18 Mar 2022 11:31

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