Bench-scale analysis of diesel-PCE mixture behavior for the Park-Euclid WQARF Site

Persistent Link:
http://hdl.handle.net/10150/191329
Title:
Bench-scale analysis of diesel-PCE mixture behavior for the Park-Euclid WQARF Site
Author:
Taylor, Renee Lamoreaux.
Issue Date:
2004
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:
The Park-Euclid WQARF (Water Quality Assurance Revolving Fund) Site is contaminated with a complex light non-aqueous phase liquid (LNAPL) mixture of tetrachloroethene (PCE), its degradation products and diesel (PCE-diesel). Because complex mixtures like PCE-diesel are composed of many compounds, accurately predicting their physiochemical behavior is often very difficult. This project was initiated to examine the mass-transfer behavior of the Park-Euclid complex mixture. Two 2-dimensional bench-scale soil vapor extraction (SVE) systems were designed and constructed. One was packed with Accusand and residual amounts of PCE-diesel and water (FC-1). The other flow cell contained only PCE-diesel and water with no media (FC-2). A 1-month long study was conducted to gain information about the evaporation behavior of the PCE-diesel mixture and the potential for a more mobile phase to form during simulated SVE. Samples of gas, water and PCE-diesel were taken before the experiments began and, in FC-2, at one week intervals during the experiment. For both flow cells, gas samples of the effluent air were taken at regular intervals during the experiments. Over the course of the experiments an estimated 20.8 percent of the original PCE was removed from FC-1 and an estimated 41.6 percent of the original PCE was removed from FC-2. For FC-2, more than half of the mass of the organics removed were determined to be hydrocarbons in the C9-C16 range which, in the field, would greatly reduce the efficiency of an activated carbon treatment system. No noticeable change in density or other physiochemical behaviors were observed for the immiscible liquid. These bench-scale experiments serve to demonstrate a scenario where all rate limitations are minimized. Real field conditions are much more complicated and removal rates would undoubtedly be much slower but the relative behavior observed in these bench-scale experiments should still apply.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Groundwater -- Pollution -- Arizona -- Tucson.; Water quality management -- Arizona -- Tucson.; Groundwater -- Quality -- Arizona -- Tucson.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Hydrology and Water Resources; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Brusseau, Mark L.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleBench-scale analysis of diesel-PCE mixture behavior for the Park-Euclid WQARF Siteen_US
dc.creatorTaylor, Renee Lamoreaux.en_US
dc.contributor.authorTaylor, Renee Lamoreaux.en_US
dc.date.issued2004en_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.abstractThe Park-Euclid WQARF (Water Quality Assurance Revolving Fund) Site is contaminated with a complex light non-aqueous phase liquid (LNAPL) mixture of tetrachloroethene (PCE), its degradation products and diesel (PCE-diesel). Because complex mixtures like PCE-diesel are composed of many compounds, accurately predicting their physiochemical behavior is often very difficult. This project was initiated to examine the mass-transfer behavior of the Park-Euclid complex mixture. Two 2-dimensional bench-scale soil vapor extraction (SVE) systems were designed and constructed. One was packed with Accusand and residual amounts of PCE-diesel and water (FC-1). The other flow cell contained only PCE-diesel and water with no media (FC-2). A 1-month long study was conducted to gain information about the evaporation behavior of the PCE-diesel mixture and the potential for a more mobile phase to form during simulated SVE. Samples of gas, water and PCE-diesel were taken before the experiments began and, in FC-2, at one week intervals during the experiment. For both flow cells, gas samples of the effluent air were taken at regular intervals during the experiments. Over the course of the experiments an estimated 20.8 percent of the original PCE was removed from FC-1 and an estimated 41.6 percent of the original PCE was removed from FC-2. For FC-2, more than half of the mass of the organics removed were determined to be hydrocarbons in the C9-C16 range which, in the field, would greatly reduce the efficiency of an activated carbon treatment system. No noticeable change in density or other physiochemical behaviors were observed for the immiscible liquid. These bench-scale experiments serve to demonstrate a scenario where all rate limitations are minimized. Real field conditions are much more complicated and removal rates would undoubtedly be much slower but the relative behavior observed in these bench-scale experiments should still apply.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshGroundwater -- Pollution -- Arizona -- Tucson.en_US
dc.subject.lcshWater quality management -- Arizona -- Tucson.en_US
dc.subject.lcshGroundwater -- Quality -- Arizona -- Tucson.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.chairBrusseau, Mark L.en_US
dc.identifier.oclc222032308en_US
All Items in UA Campus Repository are protected by copyright, with all rights reserved, unless otherwise indicated.