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The defense date of the thesis is 2008-08-20
The current date is 2019-04-24
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URN etd-0819108-150638 Statistics This thesis had been viewed 2242 times. Download 16 times. Author Li-Yen Huang Author's Email Address No Public. Department Bioengineering Year 2007 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 84 Title Very high gravity(VHG) fermentation from sorghum mash to produce ethanol Keyword sorghum ethanol fermentation bioethanol bioethanol ethanol fermentation sorghum Abstract Sorghum, cultivated in the arid area along the west coastal line of Taiwan, Chinmen and Lienchiang counties, is used to prevent from land erosion due to strong wind. Sorghum is not competing for arable land, can be harvested within 4 months, contained 60~70 % (w/w) starch, making it an ideal raw materials for ethanol production.
This study employed sorghum grain as raw material for ethanol production using an commercial active dry yeast. The medium optimization was found that 0.5% (w/v) yeast extract and 16 mM urea greatly improved the ethanol tolerance for the yeast propagation, making it possible for very high gravity (VHG) ethanol fermentation.
A 22-like design of experiment was implemented to investigate the effect of free amino nitrogen (FAN) on the sorghum fermentation at a very-high-gravity (VHG) condition. The overall ethanol production rate was 3.03 g ethanol/L-h (equivalent to 145.4 g ethanol/L in 48 h when FAN was supplemented) compared to 0.93 g ethanol/L-h (equivalent to 144.4 g ethanol/L in 156 h when FAN was not added) by using simultaneous saccharification and fermentation. Whereas, the overall ethanol production rate was 2.18 g ethanol/L-h (equivalent to 139.9 g ethanol/L in 64 h when FAN was provided) compared to 0.68 g ethanol/L-h (equivalent to 125.1 g ethanol/L in 185 h when FAN was not added) by using the operation of saccharification followed by fermentation.
The extruded sorghum was employed as another kind of raw material in ethanol production. The overall ethanol production rate was 3.63 g ethanol/L-h (equivalent to 145.2 g ethanol/L in 40 h when FAN was supplemented by using simultaneous saccharification and fermentation. The extruded sorghum could reduce the lag phase of yeast propagation in the fermentation process.
Advisor Committee Kow-Jen Duan - advisor
Chi-Yang Yu - co-chair
none - co-chair
Files Date of Defense 2008-07-25 Date of Submission 2008-08-20