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https://hdl.handle.net/2440/70747
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Type: | Journal article |
Title: | Using H-titanate nanofiber catalysts for water disinfection: Understanding and modelling of the inactivation kinetics and mechanisms |
Author: | Chong, M. Jin, B. Saint, C. |
Citation: | Chemical Engineering Science, 2011; 66(24):6525-6535 |
Publisher: | Pergamon-Elsevier Science Ltd |
Issue Date: | 2011 |
ISSN: | 0009-2509 1873-4405 |
Statement of Responsibility: | Meng Nan Chong, Bo Jin and Christopher P.Saint |
Abstract: | The H-titanate nanofiber catalyst (TNC), which has a favourable morphological structure for mass transfer and energy access, was proven as a promising alternate titanium dioxide (TiO2) carrier for photo-inactivation of a sewage isolated E. coli strain (ATCC 11775). This study revealed that the TNC loading is a key process parameter that radically influenced the photo-inactivation of bacteria in an annular slurry photoreactor (ASP) system. Variation in the TNC loadings was found to have a considerable impact on the dissolved oxygen (DO) concentration profiles and subsequently, on the photo-inactivation rates of bacteria in the ASP system. The photo-inactivation reaction in the ASP system was found to exhibit three different bacterial inactivation regimes of shoulder, log-linear and tailing. Resultant photo-inactivation kinetics data was evaluated using both empirical and mechanistic bacterial inactivation models. The modified Hom model was found to be the best empirical model that can represent the sigmoid-type bacterial inactivation pattern. An interesting correlation between the TNC loadings and DO concentration profiles was also established. From the correlation, it was found necessary to integrate a DO limiting reactant term in the newly proposed mechanistic Langmuir-Hinshelwood model to describe the bacterial inactivation mechanisms under two different TNC loading conditions of sub-optimal and optimal, respectively. © 2011 Elsevier Ltd. |
Rights: | © 2011 Elsevier Ltd. All rights reserved. |
DOI: | 10.1016/j.ces.2011.09.020 |
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.ces.2011.09.020 |
Appears in Collections: | Aurora harvest Earth and Environmental Sciences publications Environment Institute publications |
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