Microbial ecology of a crude oil contaminated aquifer

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Authors:Bekins, B. A.; Cozzarelli, I. M.; Warren, Ean; Godsy, E. M.
Author Affiliations:Primary:
U. S. Geological Survey, Menlo Park, CA, United States
Volume Title:Groundwater quality; natural and enhanced restoration of groundwater pollution
Volume Authors:Thornton, Steven F., editor; Oswald, Sascha E.
Source:IAHS-AISH Publication, Vol.275, p.57-63; Groundwater quality 2001 conference, Sheffield, United Kingdom, June 18-21, 2001, edited by Steven F. Thornton and Sascha E. Oswald. Publisher: International Association of Hydrological Sciences, International. ISSN: 0144-7815. ISBN: 1-901502-86-4
Publication Date:2002
Note:In English. 18 refs.; illus.
Summary:Detailed microbial analyses of a glacial outwash aquifer contaminated by crude oil provide insights into the pattern of microbial succession from iron reducing to methanogenic in the anaerobic portion of the contaminant plume. We analysed sediments from this area for populations of aerobes, iron reducers, fermenters and methanogens, using the most probable number method. On the basis of the microbial data the anaerobic area can be divided into distinct physiological zones dominated by either iron-reducers or a consortium of fermenters and methanogens. Chemistry and permeability data show that methanogenic conditions develop first in areas of high hydrocarbon flux. Thus, we find methanogens both in high permeability horizons and also where separate-phase crude oil is present in either the saturated or unsaturated zone. Microbial numbers peak at the top of the separate-phase oil suggesting that growth is most rapid in locations with access to both hydrocarbons and nutrients infiltrating from the surface.
Subjects:Aerobic environment; Aliphatic hydrocarbons; Alkanes; Aquifer vulnerability; Aquifers; Biodegradation; Clastic sediments; Crude oil; Ground water; Hydrocarbons; Methane; Microorganisms; Nutrients; Organic compounds; Outwash; Permeability; Petroleum products; Pollutants; Pollution; Sediments
Record ID:2004036209
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute.
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