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Date of Publication:2009-01-01

Journal:过程工程学报

Issue:4

Page Number:796-800

ISSN No.:1009-606X

Abstract:Batch and continuous processes were studied for ethanol production by fermentation of Jerusalem artichoke juice with self-flocculating yeast Saccharomyces cerevisiae flo. In the batch fermentation, ethanol production was more efficient with the simultaneous saccharification and fermentation (SSF), compared with the separate hydrolysis fermentation (SHF). The highest ethanol concentrations of 50 and 82 g/L were achieved within 26 and 34 h when Jerusalem artichoke juice containing total sugar concentrations of 105 and 179 g/L was used in the batch SSF, 6.4% and 13.8% higher than those achieved in the corresponding SHF. When the continuous SSF was applied, steady state was observed when the dilution rate of fermentation system was maintained at 0.02 h-1, and 90 g/L ethanol was produced in the effluent, being equivalent to 90% of its theoretical value. The ethanol productivity was further calculated to be 2.12 g/(L��h). Moreover, the fermentation of unsterilized raw Jerusalem artichoke juice was examined and no contamination was observed, indicating that such a process could be more competitive in saving energy consumption.

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