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Optimization of Culture Conditions for 1,3-propanediol Production from Glycerol Using Klebsiella pneumoniae  

Jun, Sun-Ae (Center for Environmental Technology research, Korea Institute of Science and Technology)
Kong, Sean W (INWOO Corporation)
Sang, Byoung-In (Center for Environmental Technology research, Korea Institute of Science and Technology)
Um, Youngsoon (Center for Environmental Technology research, Korea Institute of Science and Technology)
Publication Information
Korean Chemical Engineering Research / v.47, no.6, 2009 , pp. 768-774 More about this Journal
Abstract
To improve the productivity of 1,3-propanediol(1,3-PD) with K. pneumoniae DSM4799 using pure glycerol and crude glycerol derived from the biodiesel process, optimizing fermentation conditions was performed by changing environmental factors such as anaerobic/aerobic condition, temperature, glycerol concentration, and pH. When anaerobic conditions were maintained, there was an improved 1,3-PD production compared with that from aerobic/anaerobic 2-stage fermentation. From the results with temperature $26{\sim}37^{\circ}C$, the higher 1,3-PD production yield was observed at $30{\sim}33^{\circ}C$. For an initial glycerol concentration higher than 60 g/L, cell growth and 1,3-PD production were inhibited. When crude glycerol was used, the initial 1,3-PD production appeared to be inhibited. After 48 hr of incubation, however, 1,3-PD production with crude glycerol was even higher than that with pure glycerol, demonstrating the feasibility of 1,3-PD production using crude glycerol as a substrate. Fed-batch fermentation was applied for the high concentration of 1,3-PD without substrate inhibition. By regulating pH at 7 during the fed-batch with glycerol lower than 40 g/L, the yield of 1,3-PD was 25% higher than that without pH regulation(0.56 g/g vs. 0.45 g/g). In conclusion, based on our results, anaerobic conditions, temperature at $30^{\circ}C$, pure or crude glycerol lower than 40 g/L, and pH regulation at 7 were the optimized conditions for 1,3-PD production using K. pneumoniae DSM4799, making it more feasible to produce 1,3-PD at higher concentration and a lower price.
Keywords
Glycerol; Biodiesel Waste; 1,3-Propanediol; Optimization;
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Times Cited By KSCI : 1  (Citation Analysis)
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