Filament formation and ethanol production by Zymomonas mobilis in adsorbed cell bioreactors

Journal Article · Tue Jan 01 04:00:00 EST 1985 · Biotechnol. Bioeng.; (United States)

DOI:https://doi.org/10.1002/bit.260270512· OSTI ID:5584515

Daugulis, A J; Krug, T A; Choma, C E.T.

Zymomonas mobilis immobilized on microporous ion exchange resins has previously been shown to allow the attainment of high ethanol productivities in packed-bed bioreactors. The formation of bacterial filaments after several days of continuous operation, however, had resulted in excessive pressure increases across the reactor bed. The present work examines techniques for controlling filament formation by Z. mobilis in two reactor sizes (161 mL and 7.85 L) and a feed glucose concentration of 100 g/L. By controlling the fermentation temperature at 20-25/sup 0/C it has been possible to eliminate filament formation by Z. mobilis and to operate the large bioreactor for 232 h with an ethanol productivity of 50 g/L h (based on total reactor volume). The rate of ethanol production has been shown to be very sensitive to temperature in the range 20-30/sup 0/C, and it is likely that slightly higher temperatures than those used in this study will improve ethanol productivity while still permitting long-term operation.

• Research Organization: Queen's Univ., Canada
• OSTI ID: 5584515
• Journal Information: Biotechnol. Bioeng.; (United States), Journal Name: Biotechnol. Bioeng.; (United States) Vol. 27:5; ISSN BIBIA
• Country of Publication: United States
• Language: English

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ALCOHOLS
BACTERIA
BIOREACTORS
BIOSYNTHESIS
CELL DIVISION
DATA
ETHANOL
EXPERIMENTAL DATA
HYDROXY COMPOUNDS
IMMOBILIZED CELLS
INFORMATION
INHIBITION
MICROORGANISMS
NUMERICAL DATA
ORGANIC COMPOUNDS
PACKED BED
PRODUCTIVITY
SYNTHESIS
TEMPERATURE EFFECTS
ZYMOMONAS MOBILIS