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KMID : 1094720150200020267
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Biotechnology and Bioprocess Engineering
2015 Volume.20 No. 2 p.267 ~ p.275
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Evaluation of steady state and unsteady state mass transfer rate of Cr(VI) in immobilized Bacillus sp.
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Kathiravan Mathur Nadarajan
Gim Geun-Ho
Ryu Jae-Won
Han Gui-Hawn
Kim Si-Wouk
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Abstract
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A novel hexavalent chromium (CrVI)-removing Bacillus sp. was isolated from leather industry wastewatercontaminated soil. This potential isolate was subjected to Cr(VI) removal under free and immobilized states in a stirred batch reactor (SBR). Two biokinetic parameters, V max and K m, and the effective diffusivity (D e) for various bead sizes were calculated from Lineweaver-Burk and Eadie-Hoftsee plots, respectively. With respect to bead size, D e decreased significantly from a maximum of 3.024 × 10?6 cm2/sec in the 0.20 cm bead to 2.948 × 10?6, 1.775 × 10?7, and 1.144 × 10?7 cm2/sec in the 0.40-, 0.60- and 0.80 cm beads, respectively. Additionally, steady and unsteady state modeling of diffusional mass transfer into the immobilized beads was conducted to determine the mass transfer rate as a function of time and the beads’ radial profile. Furthermore, the space-time yield (STY) was modeled according to the residence time of the reactor. The reactor’s STY was reasonable and could be further boosted by increasing the fractional biocatalyst.
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KEYWORD
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effective diffusivity, unsteady state mass transfer, STY, SBR, Cr(VI) removal
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