The Profile of Yeast Growth During Very High Gravity Ethanol Fermentation Under Batch and Fed-batch System
Very high gravity (VHG) fermentation techonology uses high concentration of sugar. The minimum amount of sugar use in VHG fermentation techonology is 270 g/L. Under VHG fermentation, both fermentation rate and ethanol concentration can be increased. However, during VHG ethanol fermentation, the ye...
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| 主要作者: | |
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| 格式: | Final Year Project Report |
| 语言: | English |
| 出版: |
Universiti Malaysia Sarawak (UNIMAS)
2018
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| 主题: | |
| 在线阅读: | http://ir.unimas.my/id/eprint/35176/1/S.%20Jasrey%20ft.pdf http://ir.unimas.my/id/eprint/35176/ |
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| 总结: | Very high gravity (VHG) fermentation techonology uses high concentration of sugar. The minimum amount
of sugar use in VHG fermentation techonology is 270 g/L. Under VHG fermentation, both fermentation rate
and ethanol concentration can be increased. However, during VHG ethanol fermentation, the yeast cell
encounter an osmotic pressure. Besides that, the consumption of substrate and accumulation of ethanol product
during fermentation will inhibit the yeast propagation which result in cell death and incomplete sugar
utilization. Thus, in this study, the yeast growth profile (YGP) under batch and fed-batch fermentation system
were analyzed during VHG fermentation condition. Based on the YGP of batch system, the pre-determined
time for addition of fresh substrate to the fed-batch system was at 36 fermenting hour. The rate of ethanol
production and yeast growth increase under fed-batch fermentation. The highest concentration of ethanol
produce under batch system is 134.21 g/L at 84 fermenting hour while I 12.72 g/L at 36 fermenting hour for
fed-batch system. Based on the results of the yeast growth profile, fed-batch system able to dilute the formation
of exo-metabolite during fermentation and prolonged the yeast growth until 72 fermenting hours. |
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