PMID: 12775051May 31, 2003Paper

Mechanisms affecting the infiltration and distribution of ethanol-blended gasoline in the vadose zone

Environmental Science & Technology
Cory J McDowell, Susan E Powers

Abstract

One- and two-dimensional experiments were conducted to examine differences in the behavior of gasoline and gasohol (10% ethanol by volume) as they infiltrate through the unsaturated zone and spread at the capillary fringe. Ethanol in the spilled gasohol quickly partitions into the residual water in the vadose zone and is retained there as the gasoline continues to infiltrate. Under the conditions tested, over 99% of the ethanol was initially retained in the vadose zone. Depending on the volume of gasoline spilled and the depth to the water table, this causes an increase in the aqueous-phase saturation and relative permeability, thus allowing the ethanol-laden water to drain into the gasoline pool. Under the conditions tested, the presence of ethanol does not have a significant impact on the overall size or shape of the resulting gasoline pool at the capillary fringe. Residual gasoline saturations in the vadose zone were significantly reduced however because of reduced surface and interfacial tensions associated with high ethanol concentrations. The flux of ethanol in the effluent of the column ranged from 1.4 x 10(-4) to 4.5 x 10(-7) g/(cm2 min) with the LNAPL and from 6 x 10(-3) to 3.0 x 10(-4) g/(cm2 min) after water was intr...Continue Reading

Citations

Feb 5, 2013·Journal of Contaminant Hydrology·Juliana G Freitas, James F Barker
Aug 1, 2014·Journal of Environmental Sciences (China)·Ejikeme Ugwoha, John M Andresen
Nov 26, 2011·Journal of Contaminant Hydrology·Juliana G Freitas, James F Barker
Jun 10, 2011·Journal of Contaminant Hydrology·Juliana G FreitasJames F Barker
Dec 27, 2008·Journal of Contaminant Hydrology·Soonyoung YuJohn Chatzis
Nov 28, 2006·Water Research·Natalie L CápiroPedro J J Alvarez
Jan 25, 2012·Ground Water·Antonella Sciortino, Feike J Leij
Sep 29, 2012·Current Opinion in Biotechnology·Jie MaPedro J J Alvarez
Jan 15, 2015·Environmental Science. Processes & Impacts·Colin S ChenChien-Jung Tien
Apr 26, 2014·Environmental Science and Pollution Research International·Vuokko MalkOlli-Pekka Penttinen

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