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Determination of NAPL-water interfacial areas in well-characterized porous media

Dobson, Richard, Schroth, Martin H., Oostrom, Mart, Zeyer, Josef·2006·Environmental Science & Technology
DOI 10.1021/es050037p
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Abstract

The nonaqueous-phase liquid (NAPL)-water interfacial area is an important parameter which influences the rate of NAPL dissolution in porous media. The aim of this study was to generate a set of baseline data for specific interfacial area for a two-phase-entrapped NAPL-water system in well-characterized porous media and subsequently use these data to evaluate two current theoretical models. The first model tested distributes entrapped NAPL over the pore classes based on Land's algorithm and assumes the resulting blobs to be spherical. The other model is thermodynamically based, assuming that reversible work done on the system results in an increase in interfacial area, such that the area between drainage and imbibition retention curves can be related to the interfacial area. Interfacial tracer tests (IFTT) were used to measure specific entrapped NAPL (hexadecane)-water interfacial areas in columns packed with four grades (12/20, 20/30, 30/40, 40/50) of silica sand. By use of the anionic surfactant dihexylsulfosuccinate (Aerosol MA80), IFTT gave specific interfacial areas between 58 cm(-1) for the finest sand and 16 cm(-1) for the coarsest, compared to values of between 33 and 7 cm(-1) for the first model and between 19 and 5 cm(-1) for the thermodynamic model. Results from the literature suggest that nonspherical blobs shapes occur relatively frequently; hence it is reasonable to suggest that the assumption of spherical NAPL blobs may explain the underprediction by the first m…

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  • Fluid-fluid interfacial area is a function of soil properties such as grain size, grain-size distribution, and surface roughness.

    “Research has also demonstrated that fluid-fluid interfacial area is a function of soil properties such as grain size, grain-size distribution, and surface roughness (Anwar et al., 2000; Cho and Annable, 2005; Dobson et al., 2006; Brusseau et al., 2008, 2009, 2010; Peng and Brusseau, 2005).”

    From Assessing the potential contributions of additional retention processes to PFAS retardation in the subsurface (2018) · cites this paper as Dobson et al., 2006

  • Adsorption of surfactants to NAPL-water interfaces has been measured for a variety of porous media.

    “Adsorption of surfactants to NAPL-water interfaces has been measured for a variety of porous media (Saripalli et al., 1998; Cho and Annable, 2005; Dobson et al., 2006; Brusseau et al., 2008, 2009, 2010; Narter and Brusseau, 2010; McDonald et al., 2016; Zhong et al., 2016).”

    From Assessing the potential contributions of additional retention processes to PFAS retardation in the subsurface (2018) · cites this paper as Dobson et al., 2006

  • Data on surfactant adsorption to NAPL-water interfaces have been used to determine the impact of soil properties such as grain size on interfacial adsorption.

    “These data have been used to determine the impact of soil properties such as grain size on interfacial adsorption (Cho and Annable, 2005; Dobson et al., 2006; Brusseau et al., 2009, 2010).”

    From Assessing the potential contributions of additional retention processes to PFAS retardation in the subsurface (2018) · cites this paper as Dobson et al., 2006

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Metadata

Authors
Dobson, R., Schroth, M. H., Oostrom, M., & Zeyer, J.
Affiliations
Institute of Terrestrial Ecology, ETH Zurich, 8092 Zurich, Switzerland, and Pacific Northwest National Laboratory, P. O. Box 999, MS K9-33, Richland, Washington 99352
Venue
Environmental Science & Technology
Publisher
American Chemical Society (ACS)
Published
2005-12-24
Volume
40
Issue
3
Pages
815-822
ISSN
  • 0013-936X
  • 1520-5851
DOI
10.1021/es050037p
Cited by
46
References
0
Language
en

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