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Title: Evaluation of co-culture sustainability and hydrogen production in an integrated fermentative microbial electrolysis cell
Authors: Wrana, Nathan
Supervisor: Levin, David (Biosystems Engineering)
Examining Committee: Cicek, Nazim (Biosystems Engineering) Sparling, Richard (Microbiology)
Graduation Date: May 2011
Keywords: Hydrogen
Microbial electrohydrogenesis
Issue Date: 7-Apr-2011
Citation: Wrana, N., Sparling, R., Cicek, N., and D.B. Levin. (2010). Hydrogen gas production in a microbial electrolysis cell by electrohydrogenesis. Journal of Cleaner Production. 18(1): S105-S111.
Abstract: The relationship between the cellulolytic Clostridium termitidis and the electrogenic Geobacter sulfurreducens was evaluated in terms of co-culture sustainability and hydrogen production. Batch co-culture experiments in triplicate balch tubes were conducted using cellobiose as the sole carbon source and fumarate as a terminal electron acceptor. Despite high initial concentrations of acetate, no formate and very low H2 concentrations were detected, supporting the hypothesis that a syntrophic association exists between both bacteria. Co-culture growth characterization experiments were repeated in three microbial electrolysis cells and cellobiose as the sole carbon source. Initially, 9.7 mol-H2 mol-1-glucose was produced. However, a sustainable co-culture could not be maintained despite efforts to reduce reactor temperature and triple the medium’s buffering capacity. Strategies to achieve a sustainable co-culture are to minimize the carbon flux through C. termitidis by using complex substrates, maintain neutral operating conditions, and introduce acetogenic bacteria to control the flux of metabolic intermediates.
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