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Home  >  Volume 31 (July 2015)

Modelling Continuous Ethanol Fermentation: Effect of Dilution Rate and Optimisation of Substrate Consumption by Amenaghawon N.A, Osazuwa U.O. and Osayuki-Aguebor W (Pages 201-206)
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In this study, continuous ethanol fermentation coupled with in situ gas stripping was analysed using a fermentation model. The growth of cells was simulated using the Hinshelwood specific growth rate model while the production of ethanol was simulated using the Luedeking-Piret production model. The model was simulated to investigate the effect of dilution rate on the fermentation process and substrate consumption was then optimised. Results obtained showed that the fermentation process was favoured by low dilution rates as evident in the increase in the amount of ethanol produced, growth of microbial cells and substrate utilisation. Optimisation of the continuous fermentation process resulted in a substrate utilisation rate of 97% when a dilution rate of 0.01 1/h and a stripping gas flow rate of 68.34 L/hwas used.

Keywords: Modelling, Bioethanol, Fermentation, Luedeking-Piret model, Geobacillusthermoglucosidasius, Gas     stripping.