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The AAPG/Datapages Combined Publications Database
Environmental Geosciences (DEG)
Abstract
Environmental Geosciences, V.
2007. The American Association of Petroleum Geologists/Division of Environmental Geosciences. All rights reserved.
DOI:10.1306/eg.09150606006
Influence of ethanol and methyl tert-butyl ether on the biodegradation and transport of benzene in loess
Melissa Lenczewski,1 Rosa Maria Leal-Bautista,2 Steven E. Kroll3
1Department of Geology and Environmental Geosciences, Northern Illinois University, DeKalb, Illinois 60115; [email protected]
2Centro de Investigacion Cientifica de Yucatan, Centro para el Estudio del Agua, Cancun, Quintana Roo, Mexico; [email protected]
3Patrick Engineering Lisle, Inc., Illinois 60532-4101; [email protected]
AUTHORS
Melissa Lenczewski is an associate professor of geology and environmental geosciences at Northern Illinois University. Her main research areas are in contaminant hydrogeology and geomicrobiology. Her other research projects include the determination of the influence of microbial communities on the survivorship of trees in ultramafic soils (New Caledonia) and the spatial distribution of microbial communities relative to lithology, mineralogy, and contaminants.
Rosa Maria Leal-Bautista is an associate researcher at the Centro para el Estudio del Agua del Centro de Investigacion Cientifica de Yucatan, focused in the behavior of organic compounds in water and sediments. She received her Ph.D. in geology and environmental geosciences at the Northern Illinois University, her master's degree in environmental engineering from the National University of Mexico, and her bachelor's degree in chemical engineering from Universidad Popular Autonoma del Estado de Puebla, Puebla, Mexico.
Steven E. Kroll is a professional geologist with Patrick Engineering, Inc. in Lisle, Illinois. He received his master's degree in geology from Northern Illinois University and his bachelor's degree in environmental science from Bradley University, Peoria, Illinois.
ACKNOWLEDGEMENTS
This work was conducted with support of the Sigma Xi Grants-in-Aid research program, the Illinois Groundwater Association, and the Northern Illinois University Samuel Goldich Fund. The authors thank Eric Foster, Mollie Hoga, Amy Schwarz, and Guadalupe Velazquez-Oliman for field and laboratory assistance. We also thank Colin Booth and Philip Carpenter of the Northern Illinois University, in addition to two reviewers, Miles E. Denham and Janet S. Roemmel, for their insightful reviews.
ABSTRACT
The use of methyl tert-butyl ether (MTBE) as a fuel oxygenate is currently being phased out, with ethanol being the most likely replacement in most areas. Ethanol has been shown to have a negative influence on the biodegradation of petroleum hydrocarbons in the environment, with the possibility of increased benzene plume lengths. An experiment was conducted to determine the influence of ethanol and MTBE on the biodegradation and transport of benzene in fine-grained material (loess) from northern Illinois. Four undisturbed columns (0.3 m [1 ft] in diameter by 0.4 m [1.3 ft] long) of loess were collected. Uncontaminated groundwater was mixed with benzene, benzene plus MTBE, or benzene plus ethanol for injection into the column. A fourth column was continuously fed uncontaminated groundwater for 90 days as a control. Effluent concentrations of benzene were higher in the benzene-plus-ethanol and benzene-plus-MTBE column than in the benzene-only column, with the lower retardation of benzene in the presence of MTBE and ethanol. Aerobic ethanol biodegradation lowered the pH, increased the conductivity, and increased Fe(II) concentrations compared to the benzene-alone and benzene-plus-MTBE columns. This study indicates that benzene was biodegraded in the presence of ethanol, but at a substantially lower rate than benzene alone or in the presence of MTBE. The results of this study shows that the addition of ethanol or MTBE could pose a more serious threat of benzene contamination to groundwater supply wells because of slower degradation, larger benzene plumes, and decreased sorption.
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