Retention Processes Affecting VOC Vapor Transport in Water-Unsaturated Porous Media

Persistent Link:
http://hdl.handle.net/10150/191355
Title:
Retention Processes Affecting VOC Vapor Transport in Water-Unsaturated Porous Media
Author:
Silva, Jeff Allen Kai.
Issue Date:
1997
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
A series of bench-scale column experiments was conducted under soil gas venting conditions to investigate the various uptake mechanisms affecting volatile organic compound (VOC) vapor retardation in water-unsaturated porous media. The sorbent used was a commercial grade silica sand possessing an organic carbon fraction of 0.0001. Experimental variables included the VOC and moisture content. VOC retention increased with increasing moisture content. Equilibrium VOC mass distribution analyses indicate mass accumulation in the gas phase, the aqueous phase, sorbed to external surfaces, and at the gas-water interface contributed, at maximum, to only 39%, 14%, 29%, and 10% of the total mass loaded onto the column for trichloroethylene, perchloroethylene, chlorobenzene, and 1,3-dichlorobenzene, respectively. The remaining VOC mass is postulated to exist as a solute-enriched phase within the sorbent intraparticle porosity as a result of capillary phase separation/pore-filling. In addition, the results suggest intraparticle mass transfer as the rate-limiting process at long times.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Water vapor transport.; Porous materials -- Permeability.; Volatile organic compounds.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Hydrology and Water Resources; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Conklin, Martha H.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleRetention Processes Affecting VOC Vapor Transport in Water-Unsaturated Porous Mediaen_US
dc.creatorSilva, Jeff Allen Kai.en_US
dc.contributor.authorSilva, Jeff Allen Kai.en_US
dc.date.issued1997en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractA series of bench-scale column experiments was conducted under soil gas venting conditions to investigate the various uptake mechanisms affecting volatile organic compound (VOC) vapor retardation in water-unsaturated porous media. The sorbent used was a commercial grade silica sand possessing an organic carbon fraction of 0.0001. Experimental variables included the VOC and moisture content. VOC retention increased with increasing moisture content. Equilibrium VOC mass distribution analyses indicate mass accumulation in the gas phase, the aqueous phase, sorbed to external surfaces, and at the gas-water interface contributed, at maximum, to only 39%, 14%, 29%, and 10% of the total mass loaded onto the column for trichloroethylene, perchloroethylene, chlorobenzene, and 1,3-dichlorobenzene, respectively. The remaining VOC mass is postulated to exist as a solute-enriched phase within the sorbent intraparticle porosity as a result of capillary phase separation/pore-filling. In addition, the results suggest intraparticle mass transfer as the rate-limiting process at long times.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshWater vapor transport.en_US
dc.subject.lcshPorous materials -- Permeability.en_US
dc.subject.lcshVolatile organic compounds.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineHydrology and Water Resourcesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairConklin, Martha H.en_US
dc.identifier.oclc213880179en_US
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