A recently established mixed culture fermentation (MCF) model has been modified to account for the role of different electron carriers in the process. The MCF-model predicts the product spectrum as a function of the actual environmental conditions using a thermodynamic optimization criterion while satisfying a number of constraints. Other improvements made to the original model are the inclusion of formate as fermentation end-product, and gas-liquid mass transfer. The model is adequately capable of reproducing experimental results in terms of butyrate and formate versus hydrogen/carbon dioxide production. The model is not capable of predicting the production of an ethanol/acetate mixture as measured at higher pH-values, suggesting specific biochemical control. Catabolic acetate production can potentially be explained by anabolic requirements for a specific electron donor like NADH.
Modeling mixed culture fermentations; the role of different electron carriers
R. Kleerebezem, M. F. Temudo, M. C. M. van Loosdrecht, J. Rodríguez; Modeling mixed culture fermentations; the role of different electron carriers. Water Sci Technol 1 March 2008; 57 (4): 493–497. doi: https://doi.org/10.2166/wst.2008.094
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