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Comparison of oxygen mass transfer coefficient in simple and extractive fermentation systems

Paper ID Volume ID Publish Year Pages File Format Full-Text
4128 209 2009 5 PDF Available
Title
Comparison of oxygen mass transfer coefficient in simple and extractive fermentation systems
Abstract

Aeration and agitation are important variables to ensure effective oxygen transfer rate during aerobic bioprocesses; therefore, the knowledge of the volumetric mass transfer coefficient (kLa) is required. In view of selecting the optimum oxygen requirements for extractive fermentation in aqueous two-phase system (ATPS), the kLa values in a typical ATPS medium were compared in this work with those in distilled water and in a simple fermentation medium, in the absence of biomass. Aeration and agitation were selected as the independent variables using a 22 full factorial design. Both variables showed statistically significant effects on kLa, and the highest values of this parameter in both media for simple fermentation (241 s−1) and extractive fermentation with ATPS (70.3 s−1) were observed at the highest levels of aeration (5 vvm) and agitation (1200 rpm). The kLa values were then used to establish mathematical correlations of this response as a function of the process variables. The exponents of the power number (N3D2) and superficial gas velocity (Vs) determined in distilled water (α = 0.39 and β = 0.47, respectively) were in reasonable agreement with the ones reported in the literature for several aqueous systems and close to those determined for a simple fermentation medium (α = 0.38 and β = 0.41). On the other hand, as expected by the increased viscosity in the presence of polyethylene glycol, their values were remarkably higher in a typical medium for extractive fermentation (α = 0.50 and β = 1.0). A reasonable agreement was found between the experimental data of kLa for the three selected systems and the values predicted by the theoretical models, under a wide range of operational conditions.

Keywords
Fermentation medium; Extractive fermentation medium; kLa; Oxygen transfer coefficient; Agitation; Aeration
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 47, Issues 1–3, 1 December 2009, Pages 122–126
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