Effective diffusion coefficients of DNAPL waste components in saturated low permeability soil materials

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dc.authoridAyral Cinar, Derya/0000-0001-6378-6897
dc.contributor.authorAyral-Cinar, Derya
dc.contributor.authorDemond, Avery H.
dc.date.accessioned2025-03-23T19:41:13Z
dc.date.available2025-03-23T19:41:13Z
dc.date.issued2017
dc.departmentSinop Üniversitesi
dc.description.abstractDiffusion is regarded as the dominant transport mechanism into and out of low permeable subsurface lenses and layers in the subsurface. But, some reports of mass storage in such zones are higher than what might be attributable to diffusion, based on estimated diffusion coefficients. Despite the importance of diffusion to efforts to estimate the quantity of residual contamination in the subsurface, relatively few studies present measured diffusion coefficients of organic solutes in saturated low permeability soils. This study reports the diffusion coefficients of a trichloroethylene (TCE), and an anionic surfactant, Aerosol OT (AOT), in water-saturated silt and a silt-montmorillonite (25:75) mixture, obtained using steady-state experiments. The relative diffusivity ranged from 0.11 to 0.17 for all three compounds for the silt and the silt-clay mixture that was allowed to expand. In the case in which the swelling was constrained, the relative diffusivity was about 0.07. In addition, the relative diffusivity of C-13-labeled TCE through a water saturated silt-clay mixture that had contacted a field dense non aqueous phase liquid (DNAPL) for 18 months was measured and equaled 0.001. These experimental results were compared with the estimates generated using common correlations, and it was found that, in all cases, the measured diffusion coefficients were significantly lower than the estimated. Thus, the discrepancy between mass accumulations observed in the field and the mass storage that can attributable to diffusion may be greater than previously believed.
dc.description.sponsorshipStrategic Environmental Research and Development Program (SERDP) [ER 1737]
dc.description.sponsorshipFinancial support was provided by the Strategic Environmental Research and Development Program (SERDP) (Project Number ER 1737). This paper has not been subject to review by the agency; it, therefore, does not necessarily reflect the sponsor's views, and no official endorsement should be inferred.
dc.identifier.doi10.1016/j.jconhyd.2017.09.008
dc.identifier.endpage7
dc.identifier.issn0169-7722
dc.identifier.issn1873-6009
dc.identifier.pmid29074266
dc.identifier.scopus2-s2.0-85032228174
dc.identifier.scopusqualityQ1
dc.identifier.startpage1
dc.identifier.urihttps://doi.org/10.1016/j.jconhyd.2017.09.008
dc.identifier.urihttps://hdl.handle.net/11486/6526
dc.identifier.volume207
dc.identifier.wosWOS:000418215100001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.language.isoen
dc.publisherElsevier Science Bv
dc.relation.ispartofJournal of Contaminant Hydrology
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WOS_20250323
dc.subjectDiffusion
dc.subjectDNAPL waste
dc.subjectClay
dc.subjectAquitard
dc.subjectTCE
dc.subjectAOT
dc.titleEffective diffusion coefficients of DNAPL waste components in saturated low permeability soil materials
dc.typeArticle

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