Effect of Different Fermentation Modes on Butanol Production using Cassava Starch

摘要

In order to find a suit and feasible fermentation way to producting the butanol using cassava starch, the four different fermentation modes were investigated by Clostridium beijerinckii NCIMB 8052. The results showed that Simultaneous saccharificationand fermentation (SSF) produced the highest butanol (10.5g/l) and the maximum productivity rate (0.219g/lh) was attained using Separate hydrolysis and fermentation (SHF). The butanol reached 6.54g/l using Gelatinized fermentation (GF) mode without addedamylase and glucoamlyase. It is interesting that butanol could achieve using raw cassava starch by direct fermentation (DF) without any pretreatment. Therefore, if further improving the activity of enzyme about hydrolyzing the starch, GF will be a potential modelssimilar to SSFand SHFtration of fermentation is for production butanol owning to low energy and cost.