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Title: Oxygen mass transfer for an immobilised biofilm of Phanerochaete chrysosporium in a membrane gradostat reactor
Authors: Ntwampe, Seteno KO 
Sheldon, MS 
Volschenk, H 
Keywords: Phanerochaete;Membrane biorectors;Mass transfer;Extracellular enzyme production
Issue Date: 2008
Publisher: Brazilian Journal of Chemical Engineering
Source: Ntwampe, S.K.O., Sheldon, M.S. and Volschenk, H., 2008. Oxygen mass transfer for an immobilised biofilm of Phanerochaete chrysosporium in a membrane gradostat reactor. Brazilian Journal of Chemical Engineering, 25(4),649-664.
Abstract: A novel system, the membrane gradostat reactor (MGR), designed for the continuous production of secondary metabolites, has been shown to have higher production per reactor volume than batch culture systems. The MGR system mimics the natural environment in which wild occurring microorganism biofilms flourish. The biofilms are immobilised on the external surface of an ultrafiltration membrane where substrate distribution gradients are established across the biofilm. The hypothesis that, dissolved oxygen (DO) mass transfer parameters obtained in submerged pellets can be used to describe and model DO mass transfer parameters in the MGR, was refuted. Phanerochaete chrysosporium biofilms, immobilised on ultrafiltration capillary membranes in the MGR systems were used to quantify DO distribution using a Clark-type microsensor. The DO penetration depth decreased with increasing biofilm thickness, which resulted in the formation of anaerobic zones in the biofilms. Oxygen flux values of 0.27 to 0.7 g/(m2.h) were obtained during the MGR operation. The consumption of oxygen and the Monod saturation constants used in the modelling of oxygen distribution in immobilised biofilms were in the range of 894.53 to 2739.70 g/(m3.h) and 0.041 to 0.999 g/m3, respectively.
ISSN: ISSN 0104-6632
Appears in Collections:Prof. Seteno Karabo Ntwampe

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