Original scientific paper
Modeling of DBT Biodesulfurization by Resting Cells of Gordonia sp. WQ-01A Immobilized in Alginate Gel Beads in an Oil-water-immobilization System
Y. Peng
; Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, No. 92 Weijin Road, Nankai District, Tianjin 300072, P. R. China
J. Wen
; Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China
Abstract
In this study, the resting cells of Gordonia sp. WQ-01A, a DBT-desulfurizing strain, were immobilized by calcium alginate. Batch DBT biodesulfurization experiments using immobilized cells and n-dodecane as the oil phase were conducted in fermenter under
varying operating conditions such as initial DBT concentration, bead loading and the oil phase volume fraction. When the initial DBT concentration is 0.5, 1 and 5 mmol L-1, the DBT concentration dropped almost to zero after t = 40, 60 and 100 hours, respectively.
The influence of bead loading and the oil-phase volume fraction was small to the DBT biodesulfurization. Furthermore, a mathematical model was proposed to simulate the batch DBT biodesulfurization process in an oil-water-immobilization system, which took
into account the internal and external mass transfer resistances of DBT and oxygen, and the intrinsic kinetics of bacteria. To validate this model, the comparison between the model simulations and the experimental measurements of DBT concentration profiles in
the oil phase was carried out and the agreement is very good. In addition, the time and radius courses of DBT and oxygen concentrations within the alginate gel beads were reasonably
predicted by the proposed model.
Keywords
Dibenzothiophene (DBT); DBT biodesulfurization; alginate; oil-water-immobilization; modeling
Hrčak ID:
49485
URI
Publication date:
25.3.2010.
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