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Water Science & Technology—WST Vol 57 No 4 pp 493–497 © IWA Publishing 2008 doi:10.2166/wst.2008.094 Modeling mixed culture fermentations; the role of different electron carriersR. Kleerebezem, M. F. Temudo, M. C. M. van Loosdrecht and J. RodríguezDepartment of Biotechnology, Delft University of Technology, Julianalaan 67, 2628 BC, Delft, The Netherlands r.kleerebezem@tudelft.nl, m.f.temudo@tudelft.nl, m.c.m.vanloosdrecht@tudelft.nlSustainable Environment Research Centre, University of Glamorgan, . Pontypridd, CF37 1DL, Wales, UK jrodrigu@glam.ac.uk ABSTRACT 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. Keywords: acidogenesis; electron carrier; fermentation; mathematical model eProduct: Buy this article for £24.00 (IWA MEMBER PRICE: £18.00) All prices include VAT. For customers where VAT should not be applied, the VAT amount will be removed upon payment |
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