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Temporal and spatial changes of terminal electron‐accepting processes in a petroleum hydrocarbon‐contaminated aquifer and the significance for contaminant biodegradation
Author(s) -
Vroblesky Don A.,
Chapelle Francis H.
Publication year - 1994
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/94wr00067
Subject(s) - methanogenesis , sulfate , biodegradation , aquifer , environmental chemistry , groundwater recharge , hydrocarbon , petroleum , groundwater , geology , chemistry , environmental science , environmental engineering , methane , geotechnical engineering , paleontology , organic chemistry
Measurements of dissolved hydrogen and other biologically active solutes in groundwater from a shallow petroleum hydrocarbon‐contaminated aquifer indicate that the distribution of microbial terminal electron‐accepting processes (TEAPs), such as methanogenesis, sulfate reduction, and ferric iron (Fe (III)) reduction, is highly dynamic in both time and space. Delivery of sulfate to methanogenic zones by infiltrating recharge or lateral transport can result in a TEAP shift from methanogenesis to sulfate reduction. Conversely, lack of recharge and consumption of available sulfate can result in a shift from sulfate reduction to methanogenesis. Temporal shifts between sulfate and Fe (III) reduction were also observed. Time lags associated with TEAP shifts ranged from less than 10 days to about months. The relation between TEAP and biodegradation rates of a variety of organic compounds indicate that biodegradation rates of petroleum hydrocarbons probably vary temporally and spatially in a contaminated aquifer.