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Laboratory-scale and pilot-scale stabilization and solidification (S/S) remediation of soil contaminated with per- and polyfluoroalkyl substances (PFASs)

Sörengård, Mattias and Gago-Ferrero, Pablo and Berggren Kleja, Dan and Ahrens, Lutz (2021). Laboratory-scale and pilot-scale stabilization and solidification (S/S) remediation of soil contaminated with per- and polyfluoroalkyl substances (PFASs). Journal of Hazardous Materials. 402 , 123453
[Research article]

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Abstract

Remediation of soil contaminated with per-and polyfluoroalkyl substances (PFAS) is critical due to the high per-sistence and mobility of these compounds. In this study, stabilization and solidification (S/S) treatment was evaluated at pilot-scale using 6 tons of soil contaminated with PFAS-containing aqueous film-forming foam. At pilot scale, long-term PFAS removal over 6 years of precipitation (simulated using irrigation) in leachate from non-treated contaminated reference soil and S/S-treated soil with 15 % binder and 0.2 % GAC was compared. PFAS removal rate from leachate, corresponding to reduction in leaching potential after 6 years, was 97 % for four dominant PFASs (perfluorohexanoic acid (PFHxA), perfluorooctanoic acid (PFOA), perfluorohexanesulfonic acid (PFHxS) and per-fluorooctanesulfonic acid (PFOS)), but low (3%) for short-chain perfluoropentanoic acid (PFPeA). During the pilot scale experiment, PFAS sorption strength (i.e., soil-water partitioning coefficient (Kd)) increased 2to 40-fold for both reference and S/S-treated soil, to much higher levels than in laboratory-scale tests. However, PFAS behavior in pilot scale and laboratory-scale tests was generally well-correlated (p < 0.001), which will help in future S/S recipe optimization. In addition, seven PFASs were tentatively identified using an automated suspect screening approach. Among these, perfluorohexanesulfonamide and 3:2 fluorotelomer alcohol were tentatively identified and the latter had low removal rates from leachate (< 12 %) in S/S treatment.

Authors/Creators:Sörengård, Mattias and Gago-Ferrero, Pablo and Berggren Kleja, Dan and Ahrens, Lutz
Title:Laboratory-scale and pilot-scale stabilization and solidification (S/S) remediation of soil contaminated with per- and polyfluoroalkyl substances (PFASs)
Series Name/Journal:Journal of Hazardous Materials
Year of publishing :2021
Volume:402
Article number:123453
Number of Pages:9
Publisher:ELSEVIER
ISSN:0304-3894
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:PFAS, PFOS, Soil remediation, Stabilization
URN:NBN:urn:nbn:se:slu:epsilon-p-110050
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-110050
Additional ID:
Type of IDID
DOI10.1016/j.jhazmat.2020.123453
Web of Science (WoS)000593836700015
ID Code:21367
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:20 Jan 2021 15:43
Metadata Last Modified:20 Jan 2021 15:51

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