木块填料对高浓度乙醇连续发酵过程中振荡行为的弱化机制  

Attenuation mechanism of oscillatory behavior in high-gravity continuous ethanol fermentation by wood chips

作　　者：陈令伟[1] 葛旭萌[1] 赵心清[1] 陈丽杰[1] 白凤武[1] 

机构地区：[1]大连理工大学生物科学与工程系,辽宁大连116023

出　　处：《化工学报》2007年第10期2624-2628,共5页CIESC Journal

基　　金：国家自然科学基金项目(20576017)~~

摘　　要：Preliminary research indicated that oscillations of residual glucose, ethanol and biomass were effectively attenuated after the tubular bioreactors were packed with wood chips, and the corresponding mechanism was speculated to be due to cell immobilization, micro-environmental change, and change in dilution rate.In this work, the change in dilution rate was excluded from the main reason for the oscillation attenuation.Through the comparison with the performance of the tubular bioreactors packed with polyurethane particles, Raschig rings and glass beads, it was found not only high biomass concentration resulted from cell immobilization, but also most importantly, the high yeast cell viability achieved in the system packing with wood chips effectively attenuated the oscillations.Further investigation revealed that the ethanol tolerance of yeast cells in the wood chip packing system was improved compared with that in non-packed system, which might further contribute to the oscillation attenuation.Preliminary research indicated that oscillations of residual glucose, ethanol and biomass were effectively attenuated after the tubular bioreactors were packed with wood chips, and the corresponding mechanism was speculated to be due to cell immobilization, micro-environmental change, and change in dilution rate. In this work, the change in dilution rate was excluded from the main reason for the oscillation attenuation. Through the comparison with the performance of the tubular bioreactors packed with polyurethane particles, Raschig rings and glass beads, it was found not only high biomass concentration resulted from cell immobilization, but also most importantly, the high yeast cell viability achieved in the system packing with wood chips effectively attenuated the oscillations. Further investigation revealed that the ethanol tolerance of yeast cells in the wood chip packing system was improved compared with that in non-packed system, which might further contribute to the oscillation attenuation.

关 键 词：乙醇连续发酵 高浓度 振荡 填料 弱化 

分 类 号：TQ920.1[轻工技术与工程—发酵工程]