Agitation and pressure effects on acetone-butanol fermentation. [Clostridium acetobutylicum]
Batch fermentations were run at varying agitation rates and were either pressurized to 1 bar (15.2 psig) or nonpressurized. Agitation and pressure both affect the level of dissolved hydrogen gas in the media, which in turn influences solvent production. In nonpressurized fermentations volumetric productivity of butanol increased as the agitation rate decreased. While agitation had no significant effect on butanol productivity under pressurized conditions, overall butanol productivity was increased over that obtained in the nonpressurized runs. Maximum butyric acid productivity, however, was found to occur earlier and increased as agitation increased. Peak hydrogen productivity occurred simultaneously with peak butyric acid productivity. The proportion of reducing equivalents used in forming the above products was determined using a redox balance based on the fermentation stoichiometry. An inverse relationship between the final concentrations of acetone and acetoin was found in all fermentations studied. The results show that agitation and pressure are important parameters for solvent productivity in acetone-butanol fermentation.
- Research Organization:
- Colorado State Univ., Fort Collins
- DOE Contract Number:
- FG07-81ID12325
- OSTI ID:
- 5533373
- Journal Information:
- Biotechnol. Bioeng.; (United States), Vol. 27:6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACETONE
BIOSYNTHESIS
BUTANOLS
CLOSTRIDIUM ACETOBUTYLICUM
PRODUCTIVITY
MAIZE
FERMENTATION
BATCH CULTURE
EXPERIMENTAL DATA
PRESSURE EFFECTS
STIRRING
ALCOHOLS
BACTERIA
BIOCONVERSION
CEREALS
CLOSTRIDIUM
DATA
GRASS
HYDROXY COMPOUNDS
INFORMATION
KETONES
METHANOGENIC BACTERIA
MICROORGANISMS
NUMERICAL DATA
ORGANIC COMPOUNDS
PLANTS
SYNTHESIS
090222* - Alcohol Fuels- Preparation from Wastes or Biomass- (1976-1989)
140504 - Solar Energy Conversion- Biomass Production & Conversion- (-1989)