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Partial Pressures of $CO_2\;and\;H_2$ and Fate of By-products in Anaerobic Bio-Hydrogen Fermentation  

Park, Woo-Shin (Bio-Environmental Engineering Laboratory, Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology)
Kim, In-S. (Bio-Environmental Engineering Laboratory, Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology)
Publication Information
KSBB Journal / v.20, no.6, 2005 , pp. 408-412 More about this Journal
Abstract
In a previous research, it has been found that it could be possible to increase the partial pressure of hydrogen and hydrogen yield by scavenging the $CO_2$ from the heads pace of reactor. In this research, the positive and negative effects of the $CO_2$ scavenging especially on the fate of by-products were investigated by a batch experiment. Production and conversion of by-products had critical relationships with hydrogen evolution and consumption. The maximum hydrogen fraction in the headspace was increased from 66.4 to 91.2% by removing the $CO_2$ in the headspace and the degradation rate of glucose was also enhanced. The removal of $CO_2$ effectively hindered the homoacetogenesis but caused several negative phenomena. The degradation of ethanol, one of the main products, was inhibited by the high partial pressure of hydrogen and/or the absence of $CO_2$. Also it was observed that other by-products such as propionate, propanol, acetone, etc. could not be degraded further after produced from glucose. On the other hand, solventogenesis was not observed in spite of the high hydrogen partial pressure apart from previous researches and it might hinder the excess production of acetate, which could cause overall inhibition. From this research, it could be implicated that the $CO_2$ scavenging method could be recommended if the fermentation was purposed to produce hydrogen and ethanol.
Keywords
Hydrogen partial pressure; $CO_2$; fermentation; by-products;
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