Ethanol fermentation in a tower fermenter using self-aggregatingSaccharomyces uvarum |
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Authors: | Chen Chee-Shan Chan E. Wang S. L. Gong C. S. Chen L. F. |
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Affiliation: | 1.Department of Food Engineering, Da-Yeh Institute of Technology, 51505, Chan-Hwa, Taiwan, ROC ;2.Department of Food Science, Purdue University, 47906, West Lafayette, IN, USA ; |
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Abstract: | A self-aggregating strain ofSaccharomyces uvarum (U4) was used as a biocatalyst to carry out continuous ethanol fermentation in a tower fermentor equipped with a cell separator. Cell aggregates (2–3 mm) formed a stable packed bed in the fermentor, and the cell separator retained yeast cells effectively. Corn steep liquor was used as a nitrogen source for the fermentation of corn syrup and black strap molasses. An ethanol productivity of 54 g/L/h was reached using corn syrup at a dilution rate of 0.7/h, and sugar concentration in the feed was 15% (w/v). For molasses fermentation, an ethanol productivity of 22 g/L/h was obtained at a dilution rate of 0.7/h, and sugar concentration in the feed was 12.5% (w/v). Ethanol yields obtained from tower fermentation are higher than those obtained from flask fermentation (96% for corn syrup fermentation and 92% for molasses fermentation). No significant loss in fermentation activity was observed after 3 mo of operation. |
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Keywords: | KeywordHeading" >Index Entries Tower fermentor Saccharomyces uvarum ethanol fermentation aggregates, molasses |
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