TY - JOUR
T1 - The impact of composition on the physical properties and evaporative mass transfer of a PCE-diesel immiscible liquid
AU - Carroll, Kenneth C.
AU - Taylor, Renee
AU - Gray, Evan
AU - Brusseau, Mark L.
N1 - Funding Information:
This research was supported in part by funding provided by the Arizona Department of Environmental Quality, the U.S. EPA, and the NIEHS Superfund Basic Research Program (P42ES04940). We appreciate the collaboration and assistance of Miller Brooks Environmental and Golder Associates Inc. We would also like to thank Asami Murao for assistance with the GC analysis and Dr. Maier for the use of the Tensiomat instrument. Finally, we thank the reviewers for their constructive comments.
PY - 2009/5/30
Y1 - 2009/5/30
N2 - The impact of immiscible-liquid composition on mass transfer between immiscible liquid and vapor phases was evaluated for a complex mixture of chlorinated solvents and petroleum hydrocarbons. A mixture of tetrachloroethene and diesel was discovered at a site in Tucson, Arizona. Partitioning of tetrachloroethene into a layer of diesel has been observed, with resultant concentrations of tetrachloroethene up to approximately 15% by weight. The density, viscosity, surface tension, and interfacial tension were measured for tetrachloroethene-diesel mixtures with tetrachloroethene fractions ranging from 7% to 32%, and the results indicated that immiscible-liquid composition did impact the physical properties of the tetrachloroethene-diesel mixture. The results of batch phase-partitioning experiments were compared to predictions based on Raoult's Law, and the analysis indicated that immiscible-liquid/vapor and immiscible-liquid/water partitioning were both essentially ideal. Flow-cell experiments were conducted to characterize steady-state tetrachloroethene removal from the tetrachloroethene-diesel mixture via vapor extraction. The effluent concentrations for the experiment conducted with free-phase immiscible liquid were comparable to equilibrium values. Conversely, the effluent concentrations were significantly lower for the experiment wherein a residual saturation of immiscible liquid was distributed within sand. The lower concentrations for the latter experiment were attributed to dilution effects associated with a nonuniform distribution of immiscible liquid within the flow cell.
AB - The impact of immiscible-liquid composition on mass transfer between immiscible liquid and vapor phases was evaluated for a complex mixture of chlorinated solvents and petroleum hydrocarbons. A mixture of tetrachloroethene and diesel was discovered at a site in Tucson, Arizona. Partitioning of tetrachloroethene into a layer of diesel has been observed, with resultant concentrations of tetrachloroethene up to approximately 15% by weight. The density, viscosity, surface tension, and interfacial tension were measured for tetrachloroethene-diesel mixtures with tetrachloroethene fractions ranging from 7% to 32%, and the results indicated that immiscible-liquid composition did impact the physical properties of the tetrachloroethene-diesel mixture. The results of batch phase-partitioning experiments were compared to predictions based on Raoult's Law, and the analysis indicated that immiscible-liquid/vapor and immiscible-liquid/water partitioning were both essentially ideal. Flow-cell experiments were conducted to characterize steady-state tetrachloroethene removal from the tetrachloroethene-diesel mixture via vapor extraction. The effluent concentrations for the experiment conducted with free-phase immiscible liquid were comparable to equilibrium values. Conversely, the effluent concentrations were significantly lower for the experiment wherein a residual saturation of immiscible liquid was distributed within sand. The lower concentrations for the latter experiment were attributed to dilution effects associated with a nonuniform distribution of immiscible liquid within the flow cell.
KW - Diesel
KW - Multicomponent immiscible liquid
KW - PCE
KW - Raoult's Law
KW - SVE
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U2 - 10.1016/j.jhazmat.2008.09.003
DO - 10.1016/j.jhazmat.2008.09.003
M3 - Article
C2 - 18926630
AN - SCOPUS:62649169730
SN - 0304-3894
VL - 164
SP - 1074
EP - 1081
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 2-3
ER -