文献类型：期刊文献

英文题名：Simultaneous Saccharification and Ethanol Fermentation at High Corn Stover Solids Loading in a Helical Stirring Bioreactor

作者：Zhang, Jian[1];Chu, Deqiang[1];Huang, Juan[1];Yu, Zhanchun[2];Dai, Gance[1];Bao, Jie[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[2]Jilin Fuel Alcohol Co Ltd, PetroChina Corp, Jilin Econ Dev Zone, Jilin, Peoples R China

年份：2010

卷号：105

期号：4

起止页码：718

外文期刊名：BIOTECHNOLOGY AND BIOENGINEERING

收录：;EI(收录号：20100912746510);WOS:【SCI-EXPANDED(收录号:WOS:000274742200006)】；

基金：Contract grant sponsor: Natural Science Foundation of China Contract grant number: 20976051 Contract grant sponsor: Ministry of Education of China Contract grant number: 107123 Contract grant sponsor: China National Special Fund for State Key Laboratory of Bioreactor Engineering Contract grant number: 2060204

语种：英文

外文关键词：simultaneous saccharification and ethanol fermentation; lignocellulose; high solids loading; high ethanol titer; helical impeller; mixing energy consumption

摘要：The higher ethanol titer inevitably requires higher solids loading during the simultaneous enzymatic saccharification and fermentation (SSF) using lignocellulose as the feedstock. The mixing between the solid lignocellulose and the liquid enzyme is crucially important. In this study, a bioreactor with a novel helical impeller was designed and applied to the SSF operation of the steam explosion pretreated corn stover under different solids loadings and different enzyme dosages. The performances using the helical impeller and the common Rushton impeller were compared and analyzed by measuring rheological properties and the mixing energy consumption. The results showed that the new designed stirring system had better performances in the saccharification yield, ethanol titer, and energy cost than those of the Rushton impeller stirring. The mixing energy consumption under different solids loadings and enzyme dosages during SSF operation were analyzed and compared to the thermal energy in the ethanol produced. A balance for achieving the optimal energy cost between the increased mixing energy cost and the reduced distillation energy cost at the high solids loading should be made. The potentials of the new bioreactor were tested under various SSF conditions for obtaining optimal ethanol yield and titer. Biotechnol. Bioeng. 2010;105: 718-728. (C) 2009 Wiley Periodicals, Inc.