Fermentative biohydrogen production: Trends and perspectives
Review
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Overview
abstract
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Biologically produced hydrogen (biohydrogen) is a valuable gas that is seen as a future energy carrier, since its utilization via combustion or fuel cells produces pure water. Heterotrophic fermentations for biohydrogen production are driven by a wide variety of microorganisms such as strict anaerobes, facultative anaerobes and aerobes kept under anoxic conditions. Substrates such as simple sugars, starch, cellulose, as well as diverse organic waste materials can be used for biohydrogen production. Various bioreactor types have been used and operated under batch and continuous conditions; substantial increases in hydrogen yields have been achieved through optimum design of the bioreactor and fermentation conditions. This review explores the research work carried out in fermentative hydrogen production using organic compounds as substrates. The review also presents the state of the art in novel molecular strategies to improve the hydrogen production. © 2007 Springer Science%2bBusiness Media B.V.
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Anaerobic conditions; Biohydrogen; Biomass; Bioreactor; Dark fermentation; Gene manipulation; Hydrogen production; Hydrogenases; Mixed culture
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