Chiang Mai Journal of Science, Faculty of Science, Chiang Mai University

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Improvement of continuous ethanol fermentation from sweet sorghum juice by Saccharomyces cerevisiae using stirred tank bioreactor coupling with plug flow bioreactor

Paper Type	Contributed Paper
Title	Improvement of continuous ethanol fermentation from sweet sorghum juice by Saccharomyces cerevisiae using stirred tank bioreactor coupling with plug flow bioreactor
Author	Naulchan Khongsay, Lakkana Laopaiboon and Pattana Laopaiboon
Email	patlao@kku.ac.th
Abstract: The continuous ethanol production from sweet sorghum juice in a continuous stirred tank bioreactor (STR) and a combined bioreactor was compared. The combined bioreactor comprised an STR and three tubular (plug flow) bioreactors (TB) in series with a total working volume of 3320 ml. The fermentation was carried out at 30°C by Saccharomyces cerevisiae NP 01. The sweet sorghum juice containing 250 g l^-1 of total sugar was introduced into the systems at total dilution rates (D) of 0.007, 0.02 and 0.04 h^-1. Our results clearly show that the degree of ethanol production depends on the residence time of the fermentation broth in the system. In the STR system at D = 0.007 h^-1, the ethanol concentration (P), yield (Y_P/S) and productivity (Q_P) were 67.28 ± 0.37 g l^-1, 0.52 ± 0.01 g g^-1 and 0.47 ± 0.00 g l^-1 h^-1, respectively. Using the combined bioreactor (CSTR + TB) could improve ethanol production efficiency. The sugar consumption and ethanol production of the combined bioreactor system were markedly higher than those of the STR system. The highest P value (106.01 ± 0.47 g l^-1) was obtained when using the combined system at D 0.007 h^-1; and under this condition, the Y_P/S and Q_P values were 0.50 ± 0.01 g g^-1 and 0.76 ± 0.02 g l^-1 h^-1, respectively.
Start & End Page	282 - 293
Received Date	2013-07-17
Revised Date
Accepted Date	2013-10-08
Full Text	Download
Keyword	continuous ethanol fermentation, plug flow bioreactor, stirred tank bioreactor (STR), Saccharomyces cerevisiae, sweet sorghum
Volume	Vol.42 No.2 (APRIL 2015)
DOI
Citation	Khongsay N., Laopaiboon L. and Laopaiboon P., Improvement of continuous ethanol fermentation from sweet sorghum juice by Saccharomyces cerevisiae using stirred tank bioreactor coupling with plug flow bioreactor, Chiang Mai Journal of Science, 2015; 42(2): 282-293.
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Improvement of continuous ethanol fermentation from sweet sorghum juice by Saccharomyces cerevisiae using stirred tank bioreactor coupling with plug flow bioreactor

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