title: Oxygen transfer deficiencies in starch-based media.
abstract: Insufficient oxygen transfer in a highly viscous media with varying viscosity occurs during the degradation of starch byBacillus licheniformis. Oxygen transfer rate (OTR) decreased below 0.3 gl(-1) h(-1) for viscosities above 5 to 10 mPa.s and agitation speeds lower than 710 rev/min. Increasing agitation speeds by 30 to 50% compensated for the decrease in OTR for viscosities between 10 and 200 mPa.s. A dual impeller is considered essential for growth improvement.
authors.affiliation: Laboratory of Biochemical Reactors, Institute of Chemical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl.103, 1113, Sofia, Bulgaria.
authors.forename: S D
authors.initials: SD
authors.lastname: Vlaev
authors.forename: M
authors.initials: M
authors.lastname: Valeva