Continuous ethanol production and cell growth in an immobilized-cell bioreactor employing Zymomonas mobilis

Journal Article · Mon Mar 01 00:00:00 EST 1982 · Biotechnol. Bioeng. Symp.; (United States)

DOI:https://doi.org/10.1002/bit.260240306· OSTI ID:5209785

Arcuri, E J

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/sup -1/ h/sup -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.

• Research Organization: Oak Ridge National Lab., TN
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5209785
• Journal Information: Biotechnol. Bioeng. Symp.; (United States), Vol. 24:3
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
09 BIOMASS FUELS
BACTERIA
CONTINUOUS CULTURE
ETHANOL
BIOSYNTHESIS
BIOMASS
FERMENTATION
FLOCCULATION
GROWTH
ALCOHOLS
BIOCONVERSION
ENERGY SOURCES
HYDROXY COMPOUNDS
MICROORGANISMS
ORGANIC COMPOUNDS
PRECIPITATION
RENEWABLE ENERGY SOURCES
SEPARATION PROCESSES
SYNTHESIS
550700* - Microbiology
140504 - Solar Energy Conversion- Biomass Production & Conversion- (-1989)