Electrodialytic per- and polyfluoroalkyl substances (PFASs) removal mechanism for contaminated soil

Mattias Sörengård*, Georgios Niarchos, Pernille Erland Jensen, Lutz Ahrens

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Contamination of soils with per- and polyfluoroalkyl substances (PFASs) is a global problem, in particular at fire-fighter training sites due to the usage of PFAS-containing aqueous fire-fighting foams (AFFFs). In this study, an electrodialytic remediation method was applied for the first time to remove PFASs from contaminated soil. The electrodialytic remediation system was evaluated in a laboratory-scale experiment with current densities of 0.19 mA cm-2 and 0.38 mA cm-2 over 21 days, using PFAS-contaminated soil from a fire-fighter training site at Stockholm Arlanda Airport, Sweden. Of the 23 PFASs targeted, significant (p < 0.05) PFAS electromigration towards the anode was observed for C3-C7 perfluoroalkylcarboxylates (PFCAs) (PFBA, PFPeA, PFHxA, PFOA) and C4, C6, and C8 perfluoroalkane sulfonates (PFSAs)(PFBS, PFHxS, PFOS) since these PFASs were predominantly negatively charged. In contrast to the electromigration of the charged PFASs, N-methyl perfluorooctane sulfonamide (MeFOSA), perfluorooctane sulfonamidoacetic acid (FOSAA) and ethyl FOSAA (EtFOSAA) showed significant (p < 0.05) transport towards the cathode, which is probably attributed to electro-osmotic flow of these predominantly neutralPFASs. Mass balance calculations showed that for the shortest-chained PFASs (i.e., PFBA, PFPeA, PFHxA,PFBS, and PFHxS), up to 20% was extracted from the soil to the anolyte, which showed that electrodialysisis a possible in-situ remediation technique for PFAS-contaminated soil.
Original languageEnglish
JournalChemosphere
Volume232
Pages (from-to)224-231
ISSN0045-6535
DOIs
Publication statusPublished - 2019

Cite this

Sörengård, Mattias ; Niarchos, Georgios ; Jensen, Pernille Erland ; Ahrens, Lutz. / Electrodialytic per- and polyfluoroalkyl substances (PFASs) removal mechanism for contaminated soil. In: Chemosphere. 2019 ; Vol. 232. pp. 224-231.
@article{6e2f9a319fba4832bb5ff586f78c5a69,
title = "Electrodialytic per- and polyfluoroalkyl substances (PFASs) removal mechanism for contaminated soil",
abstract = "Contamination of soils with per- and polyfluoroalkyl substances (PFASs) is a global problem, in particular at fire-fighter training sites due to the usage of PFAS-containing aqueous fire-fighting foams (AFFFs). In this study, an electrodialytic remediation method was applied for the first time to remove PFASs from contaminated soil. The electrodialytic remediation system was evaluated in a laboratory-scale experiment with current densities of 0.19 mA cm-2 and 0.38 mA cm-2 over 21 days, using PFAS-contaminated soil from a fire-fighter training site at Stockholm Arlanda Airport, Sweden. Of the 23 PFASs targeted, significant (p < 0.05) PFAS electromigration towards the anode was observed for C3-C7 perfluoroalkylcarboxylates (PFCAs) (PFBA, PFPeA, PFHxA, PFOA) and C4, C6, and C8 perfluoroalkane sulfonates (PFSAs)(PFBS, PFHxS, PFOS) since these PFASs were predominantly negatively charged. In contrast to the electromigration of the charged PFASs, N-methyl perfluorooctane sulfonamide (MeFOSA), perfluorooctane sulfonamidoacetic acid (FOSAA) and ethyl FOSAA (EtFOSAA) showed significant (p < 0.05) transport towards the cathode, which is probably attributed to electro-osmotic flow of these predominantly neutralPFASs. Mass balance calculations showed that for the shortest-chained PFASs (i.e., PFBA, PFPeA, PFHxA,PFBS, and PFHxS), up to 20{\%} was extracted from the soil to the anolyte, which showed that electrodialysisis a possible in-situ remediation technique for PFAS-contaminated soil.",
author = "Mattias S{\"o}reng{\aa}rd and Georgios Niarchos and Jensen, {Pernille Erland} and Lutz Ahrens",
year = "2019",
doi = "10.1016/j.chemosphere.2019.05.088",
language = "English",
volume = "232",
pages = "224--231",
journal = "Chemosphere",
issn = "0045-6535",
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}

Electrodialytic per- and polyfluoroalkyl substances (PFASs) removal mechanism for contaminated soil. / Sörengård, Mattias; Niarchos, Georgios; Jensen, Pernille Erland; Ahrens, Lutz.

In: Chemosphere, Vol. 232, 2019, p. 224-231.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Electrodialytic per- and polyfluoroalkyl substances (PFASs) removal mechanism for contaminated soil

AU - Sörengård, Mattias

AU - Niarchos, Georgios

AU - Jensen, Pernille Erland

AU - Ahrens, Lutz

PY - 2019

Y1 - 2019

N2 - Contamination of soils with per- and polyfluoroalkyl substances (PFASs) is a global problem, in particular at fire-fighter training sites due to the usage of PFAS-containing aqueous fire-fighting foams (AFFFs). In this study, an electrodialytic remediation method was applied for the first time to remove PFASs from contaminated soil. The electrodialytic remediation system was evaluated in a laboratory-scale experiment with current densities of 0.19 mA cm-2 and 0.38 mA cm-2 over 21 days, using PFAS-contaminated soil from a fire-fighter training site at Stockholm Arlanda Airport, Sweden. Of the 23 PFASs targeted, significant (p < 0.05) PFAS electromigration towards the anode was observed for C3-C7 perfluoroalkylcarboxylates (PFCAs) (PFBA, PFPeA, PFHxA, PFOA) and C4, C6, and C8 perfluoroalkane sulfonates (PFSAs)(PFBS, PFHxS, PFOS) since these PFASs were predominantly negatively charged. In contrast to the electromigration of the charged PFASs, N-methyl perfluorooctane sulfonamide (MeFOSA), perfluorooctane sulfonamidoacetic acid (FOSAA) and ethyl FOSAA (EtFOSAA) showed significant (p < 0.05) transport towards the cathode, which is probably attributed to electro-osmotic flow of these predominantly neutralPFASs. Mass balance calculations showed that for the shortest-chained PFASs (i.e., PFBA, PFPeA, PFHxA,PFBS, and PFHxS), up to 20% was extracted from the soil to the anolyte, which showed that electrodialysisis a possible in-situ remediation technique for PFAS-contaminated soil.

AB - Contamination of soils with per- and polyfluoroalkyl substances (PFASs) is a global problem, in particular at fire-fighter training sites due to the usage of PFAS-containing aqueous fire-fighting foams (AFFFs). In this study, an electrodialytic remediation method was applied for the first time to remove PFASs from contaminated soil. The electrodialytic remediation system was evaluated in a laboratory-scale experiment with current densities of 0.19 mA cm-2 and 0.38 mA cm-2 over 21 days, using PFAS-contaminated soil from a fire-fighter training site at Stockholm Arlanda Airport, Sweden. Of the 23 PFASs targeted, significant (p < 0.05) PFAS electromigration towards the anode was observed for C3-C7 perfluoroalkylcarboxylates (PFCAs) (PFBA, PFPeA, PFHxA, PFOA) and C4, C6, and C8 perfluoroalkane sulfonates (PFSAs)(PFBS, PFHxS, PFOS) since these PFASs were predominantly negatively charged. In contrast to the electromigration of the charged PFASs, N-methyl perfluorooctane sulfonamide (MeFOSA), perfluorooctane sulfonamidoacetic acid (FOSAA) and ethyl FOSAA (EtFOSAA) showed significant (p < 0.05) transport towards the cathode, which is probably attributed to electro-osmotic flow of these predominantly neutralPFASs. Mass balance calculations showed that for the shortest-chained PFASs (i.e., PFBA, PFPeA, PFHxA,PFBS, and PFHxS), up to 20% was extracted from the soil to the anolyte, which showed that electrodialysisis a possible in-situ remediation technique for PFAS-contaminated soil.

U2 - 10.1016/j.chemosphere.2019.05.088

DO - 10.1016/j.chemosphere.2019.05.088

M3 - Journal article

VL - 232

SP - 224

EP - 231

JO - Chemosphere

JF - Chemosphere

SN - 0045-6535

ER -