An innovative consecutive batch fermentation process for very high gravity ethanol fermentation with self-flocculating yeast |
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Authors: | F Li X Q Zhao X M Ge F W Bai |
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Institution: | (1) Department of Bioscience and Bioengineering, Dalian University of Technology, Dalian, 116023, China; |
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Abstract: | An innovative consecutive batch fermentation process was developed for very high gravity (VHG) ethanol fermentation with the
self-flocculating yeast under high biomass concentration conditions. On the one hand, the high biomass concentration significantly
shortened the time required to complete the VHG fermentation and the duration of yeast cells suffering from strong ethanol
inhibition, preventing them from losing viability and making them suitable for being repeatedly used in the process. On the
other hand, the separation of yeast cells from the fermentation broth by sedimentation instead of centrifugation, making the
process economically more competitive. The VHG medium composed of 255 g L−1 glucose and 6.75 g L−1 each of yeast extract and peptone was fed into the fermentation system for nine consecutive batch fermentations, which were
completed within 8–14 h with an average ethanol concentration of 15% (v/v) and ethanol yield of 0.464, 90.8% of its theoretical value of 0.511. The average ethanol productivity that was calculated
with the inclusion of the downstream time for the yeast flocs to settle from the fermentation broth and the supernatant to
be removed from the fermentation system was 8.2 g L−1 h−1, much higher than those previously reported for VHG ethanol fermentation and regular ethanol fermentation with ethanol concentration
around 12% (v/v) as well. |
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Keywords: | |
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