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Continuous ethanol production and cell growth in an immobilized‐cell bioreactor employing Zymomonas mobilis
Author(s) -
Arcuri E. J.
Publication year - 1982
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.260240306
Subject(s) - zymomonas mobilis , bioreactor , flocculation , ethanol fuel , biomass (ecology) , ethanol , chemistry , chromatography , strain (injury) , bacteria , effluent , fermentation , food science , biology , biochemistry , environmental science , environmental engineering , organic chemistry , genetics , anatomy , agronomy
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 .