To better understand the effects of specific electron donors on the biogeochemical dynamics of Fe, S, and C under sulfate- and iron-reducing conditions, we created bicarbonate-buffered batch systems containing acetate, lactate, or glucose as the electron donor with sulfate and ferrihydrite as electron acceptors that were inoculated with native sediment containing a mixed microbial community. All electron donors tested promoted ferrihydrite reduction to varying extents: glucose >> lactate > acetate. The rates and extents of sulfate reduction were faster with lactate than with acetate, while glucose did not stimulate sulfate reduction. Our results indicated differences in total FeII production reflecting the development of difference glucose-fermenting communities in the replicate glucose incubations. The incubations with acetate and lactate also showed major community shifts over time, but they were different from each other and from the community profiles in glucose amended incubations.

Effects of electron donor on the biogeochemical dynamics of Fe, S, and C under sulfate- and iron-reducing conditions

245th National Meeting (2013)

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