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Gas-liquid mass transfer performance of dual impeller system employing rushtons, concave-bladed disc (CD-6) turbines and their combination in stirred tank bioreactor

Suhaili, Nurashikin and Mohamed, Mohd Shamzi and Mohamad, Rosfarizan and Ariff, Arbakariya (2010) Gas-liquid mass transfer performance of dual impeller system employing rushtons, concave-bladed disc (CD-6) turbines and their combination in stirred tank bioreactor. Journal of Applied Sciences Research, 6 (3). pp. 234-244. ISSN 1816-157X

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Abstract

The degree of oxygenation in stirred tank bioreactor is normally described and characterized L by the volumetric gas-liquid mass transfer coefficient (kL a). Throughout this study, the gas liquid mass transfer performance of dual impeller stirring system employing either two Rushton turbines (RT), two Concave-bladed disc (CD-6) turbines or the combination of both was comparatively investigated in Newtonian and non-Newtonian fluid systems. Static gassing-out technique was applied in all experimental kLa determinations and subsequent modeling of mass transfer correlations for all configurations were developed by incorporating the effects of power number (N3D2) and superficial velocity (Vg) on kLa. Ultimately, the use of dual CD-6 stirrers on a mixing shaft improved the oxygen transfer rate (OTR) by about 5-50 % and 18-65 % higher than the conventional RT-RT system in Newtonian and non-Newtonian systems, respectively.

Item Type:Article
Keyword:Concavebladed disc turbine; Correlation modeling; Oxygen transfer; Rushton turbine; Volumetric gas-liquid mass transfer coefficient
Faculty or Institute:Faculty of Biotechnology and Biomolecular Sciences
Publisher:INSInet Publication
ID Code:14846
Deposited By: Nida Hidayati Ghazali
Deposited On:08 Aug 2012 18:20
Last Modified:15 Mar 2016 09:15

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