Abstract
Production of bioethanol is one of the important bioprocesses for the energy industry to provide inexpensive renewable resources all over the world. In this context, this research was organized for continuous ethanol fermentation from carob pod extract which is an inexpensive carbon source by free or immobilized S. cerevisiae cells. Continuous ethanol fermentations were performed with different HRT (from 4 to 20 h) and optimal HRT were 8 h for the free cell, and 6.67 h for immobilized cell, respectively. The highest volumetric ethanol productivities for free cell and immobilized cell fermentations were 3.12 g/L/h and 3.37 g/L/h at HRT of 5.71 h, respectively. All kinetic parameters clearly showed that both cell types can be used for ethanol fermentation, and immobilized S. cerevisiae ethanol fermentation can be operated at higher dilution rates independent of biomass than a free cell.
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