Dissolution and mass flux from trichloroethene- and toluene- hexadecane multicomponent nonaqueous phase liquid (NAPL) mixtures

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dc.contributor Donahoe, Rona Jean
dc.contributor Lu, Yuehan
dc.contributor Carroll, Kenneth C.
dc.contributor.advisor Tick, Geoffrey R.
dc.contributor.author Padgett, Mark
dc.date.accessioned 2017-03-01T17:23:05Z
dc.date.available 2017-03-01T17:23:05Z
dc.date.issued 2015
dc.identifier.other u0015_0000001_0001889
dc.identifier.other Padgett_alatus_0004M_12252
dc.identifier.uri https://ir.ua.edu/handle/123456789/2319
dc.description Electronic Thesis or Dissertation
dc.description.abstract Remediation efforts and contaminant transport predictions generally neglect the complicated dissolution and transport behavior associated with multi-component nonaqueous phase liquid (NAPL) sources. Therefore, it is important to understand the diffusion and dissolution processes occurring in these multicomponent systems as a function of mole fraction, molecular similarity/dissimilarity, and nonideal hydraulic factors. A series of laboratory scale NAPL-aqueous phase dissolution experiments were conducted to assess dissolution and intra- NAPL diffusion as a function of multicomponent NAPL composition (mole fraction) for both trichloroethene (TCE) and toluene (TOL). Predetermined volumes of target NAPL compounds were mixed with an insoluble n-hexadecane (HEX) NAPL to create mixtures that vary by NAPL composition. The ideality of resulting target compound dissolution was evaluated by quantifying NAPL-phase activity coefficient through Raoult's Law analysis. The results show that dissolution from the NAPL mixtures behave ideally for mole fractions above 0.2. As the target compound fraction of the NAPL mixture gets smaller, the dissolution behavior becomes increasingly nonideal (larger NAPL-phase activity coefficients). The TOL:HEX mole fraction mixtures show greater nonideality at equilibrium and initial elution concentrations for batch and column experiments when compared to TCE:HEX systems. Mass flux reduction analysis shows that the 0.5:0.5:, 0.2:0.8, and 0.1:0.9 mole fractions of both TCE and TOL behave similarly while the 0.05:0.95 mole fractions of TCE and TOL behave the most nonideally and exhibit mass flux reduction before any other mole fractions. Overall, the dissolution rates were constant and not controlled by NAPL composition-dependent factors. The results of this work may be used to improve transport predictions, remediation design, and risk assessments especially for sites contaminated by complex NAPL mixtures.
dc.format.extent 61 p.
dc.format.medium electronic
dc.format.mimetype application/pdf
dc.language English
dc.language.iso en_US
dc.publisher University of Alabama Libraries
dc.relation.ispartof The University of Alabama Electronic Theses and Dissertations
dc.relation.ispartof The University of Alabama Libraries Digital Collections
dc.relation.hasversion born digital
dc.rights All rights reserved by the author unless otherwise indicated.
dc.subject.other Hydrologic sciences
dc.subject.other Geochemistry
dc.subject.other Environmental geology
dc.title Dissolution and mass flux from trichloroethene- and toluene- hexadecane multicomponent nonaqueous phase liquid (NAPL) mixtures
dc.type thesis
dc.type text
etdms.degree.department University of Alabama. Dept. of Geological Sciences
etdms.degree.discipline Geology
etdms.degree.grantor The University of Alabama
etdms.degree.level master's
etdms.degree.name M.S.


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