Continuous ethanol production and cell growth in an immobilized-cell bioreactor employing Zymomonas mobilis
Ethanol-producing bioreactors employing cells of Zymomonas mobilis attached to glass-fiber pads were operated continuously for as long as 28 days. Ethanol production, which is related to bed-associated biomass levels, was found to occur in three distinct phases: an exponential phase, a linear phase,...
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| Published in | Biotechnology and bioengineering Vol. 24; no. 3; p. 595 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
United States
01.03.1982
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| Online Access | Get more information |
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| Summary: | Ethanol-producing bioreactors employing cells of Zymomonas mobilis attached to glass-fiber pads were operated continuously for as long as 28 days. Ethanol production, which is related to bed-associated biomass levels, was found to occur in three distinct phases: an exponential phase, a linear phase, and a "steady-state" phase. After prolonged operation, a bacterial floc developed in the reactor. The maximum effluent ethanol concentration and the maximum volumetric productivity were 6.4% and 152 g L(-1) h(-1), respectively, and both were attained at a liquid residence time of from 10-15 min. Both maxima occurred after the development of the bacterial floc. The flocculant bacterium has been isolated and tentatively identified as a flocculant strain of Z. mobilis. |
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| ISSN: | 0006-3592 1097-0290 |
| DOI: | 10.1002/bit.260240306 |