This study presents the external mass transfer effects on the reduction
of hexavalent chromium (Cr(VI)) using calcium alginate immobilized
Bacillus sp. in a re-circulated packed bed batch reactor (RPBR).
The effect of flow rate on the reduction Cr(VI) was studied. Theoretically
calculated rate constants for various flow rates were analyzed using
external film diffusion models and compared with experimental values.
The external mass transfer coefficients for the bioconversion of
Cr(VI) were also investigated. The external mass transfer effect
was correlated with a model of the type J(D)=K Re(-(1-n). The model
was tested with various K values and the mass transfer correlation
J(D)=5.7 Re(-0.70) was found to predict the experimental data accurately.
The proposed model would be useful for the design of industrial reactor
and scale up.
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