摘要：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.
关键词：Continuous fermentation; free and immobilized cells; stirred tank bioreactor
