Influence of electron donor on the minimum sulfate concentration required for sulfate reduction in a petroleum hydrocarbon-contaminated aquifer

Article Abstract:

Abundant electron donor availability enabled methanogenc bacteria (MB) to sequester a portion of the electron flow in a petroleum hydrocarbon-dominated aquifer, even in the presence of sufficient concentrations of sulfate to enable sulfate reduction. Limited electron donor availability, on the other hand, allowed sulfate-reducing bacteria (SRB) to outcompete MB for available substrate at a lower concentration of sulfate than when electron donor was abundant. Thus, fluctuations in electron donor availability influenced the competition between SRB and MB for control of electron flow.

Electron donor-acceptor complexes, Sulfates

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Atrazine mineralization potential of alluvial-aquifer sediments under aerobic conditions

Article Abstract:

Atrazine mineralization potential under aerobic conditions in alluvial-aquifer sediments is dependent on the structure of the atrazine compound, according to a recent study conducted in an Ohio flood plain. Less than .1% of an atrazine compound with a ring structure was mineralized in 23 days. In contrast, ethyl-2-carbon atrazine mineralization, under aerobic conditions, was observed in shallow sediments and was sometimes detectable in deep sediments. Thus, atrazine compounds, which are often used in herbicides, may pass through to the water table if the structures are ringed.

Atrazine, Soil mineralogy

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Anaerobic mineralization of vinyl chloride in Fe(III)-reducing, aquifer sediments

Article Abstract:

Vinyl chloride is a highly toxic and carcinogenic compound most often found in aquifer systems. Biodegradation of vinyl chloride by indigenous microorganisms has been proposed for contaminated, anaerobic aquifer systems. The approach requires iron(III)-reducing conditions to promote anaerobic oxidation of the compound. This process of rapid microbial degradation is also known as anaerobic mineralization.

Methods, Environmental aspects, Bioremediation, Vinyl chloride

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