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Enhancement and repression of the volumetric oxygen transfer coefficient through hydrocarbon addition and its influence on oxygen transfer rate in stirred tank bioreactors

Paper ID Volume ID Publish Year Pages File Format Full-Text
4669 237 2006 6 PDF Available
Title
Enhancement and repression of the volumetric oxygen transfer coefficient through hydrocarbon addition and its influence on oxygen transfer rate in stirred tank bioreactors
Abstract

The oxygen transfer rate (OTR) is a key parameter in aerobic bioprocesses, and in particular, in hydrocarbon-based bioprocesses where a proportionately higher rate is required due to the oxygen deficient structure of the substrate. The OTR is dependent on the oxygen transfer coefficient (KLa) and the differing oxygen solubilities in the immiscible liquid phases. In this study, KLa was evaluated at six discrete alkane concentrations (0, 2.5, 5, 10, 15 and 20 vol.%) over a range of agitation rates (200–1200 rpm) and aeration rates (0.5–1.5 vvm). The influence of alkane on KLa and hence OTR, was shown to be markedly dependent on the agitation rate. At agitation rates of 800 rpm and above, KLa was enhanced with increasing alkane concentration up to 10%, after which KLa repression became evident. At agitation rates below 800 rpm, KLa was repressed below that in water, at all alkane concentrations. Maximum KLa was obtained at an agitation rate between 1000 and 1200 rpm and an alkane concentration between 5 and 10%. Maximum OTR was similarly attained between 1000 and 1200 rpm although the high oxygen solubility in the alkane shifted the optimum alkane concentration to between 15 and 20%.

Keywords
Agitation; Aeration; Bioreactors; Dissolved oxygen; Gas–liquid mass transfer; Oxygen transfer; Alkane concentration
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Enhancement and repression of the volumetric oxygen transfer coefficient through hydrocarbon addition and its influence on oxygen transfer rate in stirred tank bioreactors
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 28, Issue 3, 1 March 2006, Pages 237–242
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us