Assessment of Mobilization Potential of Per- and Polyfluoroalkyl Substances for Soil Remediation.

Nguyen, TMH; Bräunig, J; Kookana, RS; Kaserzon, SL; Knight, ER; Vo, HNP; Kabiri, S; Navarro, DA; Grimison, C; Riddell, N; Higgins, CP; McLaughlin, MJ; Mueller, JF

Assessment of Mobilization Potential of Per- and Polyfluoroalkyl Substances for Soil Remediation.

Nguyen, TMH Bräunig, J Kookana, RS Kaserzon, SL Knight, ER Vo, HNP Kabiri, S Navarro, DA Grimison, C Riddell, N Higgins, CP McLaughlin, MJ Mueller, JF

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Publisher:: American Chemical Society (ACS)
Publication Type:: Journal Article
Citation:: Environ Sci Technol, 2022, 56, (14), pp. 10030-10041
Issue Date:: 2022-07-19

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Field	Value	Language
dc.contributor.author	Nguyen, TMH
dc.contributor.author	Bräunig, J
dc.contributor.author	Kookana, RS
dc.contributor.author	Kaserzon, SL
dc.contributor.author	Knight, ER
dc.contributor.author	Vo, HNP
dc.contributor.author	Kabiri, S
dc.contributor.author	Navarro, DA
dc.contributor.author	Grimison, C
dc.contributor.author	Riddell, N
dc.contributor.author	Higgins, CP
dc.contributor.author	McLaughlin, MJ
dc.contributor.author	Mueller, JF
dc.date.accessioned	2023-03-28T03:17:44Z
dc.date.available	2023-03-28T03:17:44Z
dc.date.issued	2022-07-19
dc.identifier.citation	Environ Sci Technol, 2022, 56, (14), pp. 10030-10041
dc.identifier.issn	0013-936X
dc.identifier.issn	1520-5851
dc.identifier.uri	http://hdl.handle.net/10453/168679
dc.description.abstract	This study investigated the mobilization of a wide range of per- and polyfluoroalkyl substances (PFASs) present in aqueous film-forming foams (AFFFs) in water-saturated soils through one-dimensional (1-D) column experiments with a view to assessing the feasibility of their remediation by soil desorption and washing. Results indicated that sorption/desorption of most of the shorter-carbon-chain PFASs (C ≤ 6) in soil reached greater than 99% rapidly─after approximately two pore volumes (PVs) and were well predicted by an equilibrium transport model, indicating that they will be readily removed by soil washing technologies. In contrast, the equilibrium model failed to predict the mobilization of longer-chain PFASs (C ≥ 7), indicating the presence of nonequilibrium sorption/desorption (confirmed by a flow interruption experiment). The actual time taken to attain 99% sorption/desorption was up to 5 times longer than predicted by the equilibrium model (e.g., ∼62 PVs versus ∼12 PVs predicted for perfluorooctane sulfonate (PFOS) in loamy sand). The increasing contribution of hydrophobic interactions over the electrostatic interactions is suggested as the main driving factor of the nonequilibrium processes. The inverse linear relationship (R2 = 0.6, p < 0.0001) between the nonequilibrium mass transfer rate coefficient and the Freundlich sorption coefficient could potentially be a useful means for preliminary evaluation of potential nonequilibrium sorption/desorption of PFASs in soils.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	American Chemical Society (ACS)
dc.relation.ispartof	Environ Sci Technol
dc.relation.isbasedon	10.1021/acs.est.2c00401
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Environmental Sciences
dc.subject.mesh	Fluorocarbons
dc.subject.mesh	Soil
dc.subject.mesh	Soil Pollutants
dc.subject.mesh	Water
dc.subject.mesh	Water Pollutants, Chemical
dc.subject.mesh	Water
dc.subject.mesh	Fluorocarbons
dc.subject.mesh	Soil
dc.subject.mesh	Soil Pollutants
dc.subject.mesh	Water Pollutants, Chemical
dc.subject.mesh	Fluorocarbons
dc.subject.mesh	Soil
dc.subject.mesh	Soil Pollutants
dc.subject.mesh	Water
dc.subject.mesh	Water Pollutants, Chemical
dc.title	Assessment of Mobilization Potential of Per- and Polyfluoroalkyl Substances for Soil Remediation.
dc.type	Journal Article
utslib.citation.volume	56
utslib.location.activity	United States
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
utslib.copyright.status	closed_access	*
dc.date.updated	2023-03-28T03:17:43Z
pubs.issue	14
pubs.publication-status	Published
pubs.volume	56
utslib.citation.issue	14

Abstract:

This study investigated the mobilization of a wide range of per- and polyfluoroalkyl substances (PFASs) present in aqueous film-forming foams (AFFFs) in water-saturated soils through one-dimensional (1-D) column experiments with a view to assessing the feasibility of their remediation by soil desorption and washing. Results indicated that sorption/desorption of most of the shorter-carbon-chain PFASs (C ≤ 6) in soil reached greater than 99% rapidly─after approximately two pore volumes (PVs) and were well predicted by an equilibrium transport model, indicating that they will be readily removed by soil washing technologies. In contrast, the equilibrium model failed to predict the mobilization of longer-chain PFASs (C ≥ 7), indicating the presence of nonequilibrium sorption/desorption (confirmed by a flow interruption experiment). The actual time taken to attain 99% sorption/desorption was up to 5 times longer than predicted by the equilibrium model (e.g., ∼62 PVs versus ∼12 PVs predicted for perfluorooctane sulfonate (PFOS) in loamy sand). The increasing contribution of hydrophobic interactions over the electrostatic interactions is suggested as the main driving factor of the nonequilibrium processes. The inverse linear relationship (R2 = 0.6, p < 0.0001) between the nonequilibrium mass transfer rate coefficient and the Freundlich sorption coefficient could potentially be a useful means for preliminary evaluation of potential nonequilibrium sorption/desorption of PFASs in soils.

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http://hdl.handle.net/10453/168679