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https://hdl.handle.net/2440/61888
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Type: | Journal article |
Title: | Bacterial inactivation kinetics, regrowth and synergistic competition in a photocatalytic disinfection system using anatase titanate nanofiber catalyst |
Author: | Chong, M. Jin, B. Zhu, H. Saint, C. |
Citation: | Journal of Photochemistry and Photobiology A: Chemistry, 2010; 214(1):1-9 |
Publisher: | Elsevier Science Sa |
Issue Date: | 2010 |
ISSN: | 1010-6030 |
Statement of Responsibility: | Meng Nan Chong, Bo Jin, Huaiyong Zhu, Chris Saint |
Abstract: | This work studied the inactivation kinetics, bacterial regrowth and synergistic competition in the photocatalytic disinfection of a sewage isolated Escherichia coli (ATCC 11775) in an annular slurry photoreactor (ASP) system using anatase titanate nanofibers catalyst (TNC). The inactivation performance and disinfection kinetics of the TNC-ASP system were investigated with respect to operation conditions: TNC loading, pH, aeration rate and inoculums size. At the optimum conditions, a 99.999% inactivation of 7 × 106 CFU mL-1 E. coli was achieved in 60 min. The modified Hom model was used to perfectly-fit the sigmoid-shaped disinfection kinetic profile. The residual disinfecting effect was evaluated by post-irradiation Fenton reaction. It was found that the 1.0 mg L-1 Fe2+ in conjunction with low chemical oxygen demand (COD) was able to initiate the post-photocatalytic Fenton reaction, where substantial bacterial regrowth was suppressed after 24 h treatment. Studies on the synergistic effect of COD concentration on the inactivation and the bacterial regrowth potential revealed that the E. coli could regrowth at a COD concentration over 16 mg L-1. Thus, significant removal of COD has to be ensured in a photocatalytic disinfection process to successfully maintain the biostability of the treated water. © 2010 Elsevier B.V. |
Keywords: | TiO₂ Nanofibers Annular reactor Photocatalysis Bacterial inactivation E. coli Post-disinfection Fenton reaction Synergistic competition |
Rights: | Copyright © 2010 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.jphotochem.2010.05.018 |
Grant ID: | http://purl.org/au-research/grants/arc/LP0562153 http://purl.org/au-research/grants/arc/LP0562153 |
Published version: | http://dx.doi.org/10.1016/j.jphotochem.2010.05.018 |
Appears in Collections: | Aurora harvest Chemical Engineering publications Environment Institute publications |
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