Fermentative production of ethanol from syngas using novel moderately alkaliphilic strains of Alkalibaculum bacchi

► Alkalibaculum bacchi strains CP11T, CP13 and CP15 make ethanol from CO, H2 and CO2. ► CP11T, CP13 and CP15 are moderately alkaliphilic strains grow at pH about 8.0. ► CP15 is the most promising strain due to its high growth and ethanol yield. ► Ethanol yields from utilized CO by CP15 were between...

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Bibliographic Details
Published in:Bioresource technology 2012-01, Vol.104, p.336-341
Main Authors: Liu, Kan, Atiyeh, Hasan K., Tanner, Ralph S., Wilkins, Mark R., Huhnke, Raymond L.
Format: Article
Language:English
Subjects:
Acetic acid
Alkalibaculum bacchi
Alkalies - metabolism
Bacteria - classification
Bacteria - metabolism
biomass
bottles
carbon dioxide
Coal
Ethanol
Ethanol - isolation & purification
Ethanol - metabolism
ethanol production
Fermentation
Gases - metabolism
Hydrophobic and Hydrophilic Interactions
Moderately alkaliphilic bacterium
Species Specificity
Syngas fermentation
yeast extract
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Summary:► Alkalibaculum bacchi strains CP11T, CP13 and CP15 make ethanol from CO, H2 and CO2. ► CP11T, CP13 and CP15 are moderately alkaliphilic strains grow at pH about 8.0. ► CP15 is the most promising strain due to its high growth and ethanol yield. ► Ethanol yields from utilized CO by CP15 were between 65% and 76%. Ethanol production from syngas using three moderately alkaliphilic strains of a novel genus and species Alkalibaculum bacchi CP11T, CP13 and CP15 was investigated in 250ml bottle fermentations containing 100ml of yeast extract medium at 37°C and pH 8.0. Two commercial syngas mixtures (Syngas I: 20% CO, 15% CO2, 5% H2, 60% N2) and (Syngas II: 40% CO, 30% CO2, 30% H2) were used. Syngas I and Syngas II represent gasified biomass and coal, respectively. The maximum ethanol concentration (1.7gl−1) and yield from CO (76%) were obtained with strain CP15 and Syngas II after 360h. CP15 produced over twofold more ethanol with Syngas I compared to strains CP11T and CP13. In addition, CP15 produced 18% and 71% more ethanol using Syngas II compared to strains CP11T and CP13, respectively. These results show that CP15 is the most promising for ethanol production because of its higher growth and ethanol production rates and yield compared to CP11T and CP13.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2011.10.054