4. Conclusion
This study showed that the flocculating S. cerevisiae strain KF-7
is appropriate for establishing continuous ethanol fermentation
process using sugar beet raw juice and thick juice as feed, with the
advantages of improved productivity and thermotolerant fermentation. Single-stage fermentation was sufficient for sugar beet raw
juice. Two-stage fermentation was proper for sugar beet thick juice.
Although ethanol concentration fluctuated in the second reactor
(R2) due to stress of high ethanol concentration (80 g L1), it was
overcome by feeding fresh yeast cells.