Analysis of distribution of oxygen transfer rate in stirred bioreactors for bacterial broths

Dan Cascaval1, Anca-Irina Galaction2, Stefanica Camarut1

1 Gheorghe Asachi Technical University of Iasi, Faculty of Chemical Engineering and Environmental Protection, Department of Organic and Biochemical Engineering, 71 Mangeron Blvd., 700050, Iasi, Romania
2 Gr.T. Popa University of Medicine and Pharmacy of Iasi, Faculty of Medical Bioengineering, Department of Medical Biotechnologies, 9-13 M. Kogalniceanu Str., 700454, Iasi, Romania

Abstract


The study on the distribution of oxygen transfer rate in a stirred bioreactor for Propionibacterium shermanii broths underlined the major influence of the presence and concentration of biomass on the interphasic transfer of oxygen. Owing to the bubbles surface blockage by the bacterial cells, the accumulation of biomass from 30.5 to 120.5 g/l d.w. led to the decreasing of kla for about 1.3

Keywords


kla; mass transfer; mass transfer coefficient; Propionibacterium shermanii; specific power input; stirred bioreactor; superficial air velocity.

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