Substitution of H2-Acceptor Organism with Catalytic Hydrogenation System in Methanogen Coupled Fermentations
In recent years there has been considerable interest in anaerobic digestion as a waste-treatment process and for the production of biogas. However, in industrialised economies, the latter is considered mostly uneconomical. This situation could be reversed if fermentations could be modified favouring the production of more valuable products than methane. One possible alternative to biogas would be the production of volatile fatty acids and hydrogen. The organisms important to this process in digestion are the obligate proton reducing acetogens.1–4 The energy metabolism of these organisms normally depends on hydrogen removal by methanogens or sulphate reducers.5,6 Thus, if alternatives for the utilization of this gas are to be sought, they must provide an effective substitute for the H2 consuming organisms.
KeywordsVolatile Fatty Acid Organic Acid Production Cellulose Fermentation Ruminococcus Albus Methanospirillum Hungatei
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