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

Journal Article · Mon Mar 01 04:00:00 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), Journal Name: Biotechnol. Bioeng. Symp.; (United States) Vol. 24:3; ISSN BIBSB
• Country of Publication: United States
• Language: English

Related Subjects

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