Biosynthesis of Ethanol and Hydrogen by Glycerol Fermentation Using Escherichia coli
Nida Chaudhary, Michael O. Ngadi, Benjamin K. Simpson, Lamin S. Kassama
DOI: 10.4236/aces.2011.13014   PDF   HTML     9,500 Downloads   21,539 Views   Citations


Production of high value products from glycerol via anaerobic fermentation is of utmost importance for the biodiesel industry. The microorganism Escherichia coli (E. coli) K12 was used for fermentation of glycerol. The effects of glycerol concentration and headspace conditions on the cell growth, ethanol and hydrogen production were investigated. A full factorial experimental design with 3 replicates was conducted in order to test these factors. Under the three headspace conditions tested, the increase of glycerol concentration accelerated glycerol fermentation. The yields of hydrogen and ethanol were the lowest when glycerol concentration of 10 g/L was used. The maximum production of hydrogen was observed with an initial glycerol concentration of 25 g/L at a final concentration of hydrogen was 32.15 mmol/L. This study demonstrated that hydrogen production negatively affects cell growth. Maximum ethanol yield was obtained with a glycerol concentration of 10 g/L and was up to 0.40 g/g glycerol under membrane condition headspace. Statistical optimization showed that optimal conditions for hydrogen production are 20 g/L initial glycerol with initial sparging of the reactor headspace. The optimal conditions for ethanol production are 10 g/L initial glycerol with membrane.

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N. Chaudhary, M. Ngadi, B. Simpson and L. Kassama, "Biosynthesis of Ethanol and Hydrogen by Glycerol Fermentation Using Escherichia coli," Advances in Chemical Engineering and Science, Vol. 1 No. 3, 2011, pp. 83-89. doi: 10.4236/aces.2011.13014.

Conflicts of Interest

The authors declare no conflicts of interest.


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