TY - JOUR
T1 - Bacterial inactivation kinetics of a photo-disinfection system using novel titania-impregnated kaolinite photocatalyst
AU - Chong, Meng Nan
AU - Jin, Bo
AU - Saint, Christopher P.
N1 - Funding Information:
The authors would like to thank Ms. Vipasiri Vimonses and Mr. Mats Drews for their assistance during the study. This work was funded by the Australian Research Council Linkage Grant ( LP0562153 ) and the Australian Water Quality Centre, SA Water Corporation through the Water Environmental Biotechnology Laboratory (WEBL) at the University of Adelaide, Australia.
Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2011/6/15
Y1 - 2011/6/15
N2 - We recently developed a novel titania-impregnated kaolinite (TiO2-K) catalyst and an annular slurry photoreactor (ASP). The present study was to determine the optimal operational factors: TiO2-K loading, pH, aeration rate, bacterial population and irradiation time, and their impact on disinfection activity and kinetics of a sewage-isolated Escherichia coli sp. (ATCC 11775). The inactivation kinetics were evaluated with experimental data and three Hom series empirical models, namely; the Hom model, modified-Hom model and Hom-Power model. The bacterial inactivation rate in the ASP-TiO2-K system was pH-independent up to pH 7.0. At optimum conditions, 120min irradiation time was required to achieve 5 bacterial log-reduction units for an average bacterial inoculum size of 8.0×106CFUmL-1. A sigmoid-shape bacterial inactivation profile with strong shoulder and prolonged tailing characteristics was proven. The inactivation kinetic studies revealed that the modified Hom model appeared to be the best empirical model that could represent the disinfection kinetics, with three different inactivation characteristic regions in the ASP-TiO2-K system.
AB - We recently developed a novel titania-impregnated kaolinite (TiO2-K) catalyst and an annular slurry photoreactor (ASP). The present study was to determine the optimal operational factors: TiO2-K loading, pH, aeration rate, bacterial population and irradiation time, and their impact on disinfection activity and kinetics of a sewage-isolated Escherichia coli sp. (ATCC 11775). The inactivation kinetics were evaluated with experimental data and three Hom series empirical models, namely; the Hom model, modified-Hom model and Hom-Power model. The bacterial inactivation rate in the ASP-TiO2-K system was pH-independent up to pH 7.0. At optimum conditions, 120min irradiation time was required to achieve 5 bacterial log-reduction units for an average bacterial inoculum size of 8.0×106CFUmL-1. A sigmoid-shape bacterial inactivation profile with strong shoulder and prolonged tailing characteristics was proven. The inactivation kinetic studies revealed that the modified Hom model appeared to be the best empirical model that could represent the disinfection kinetics, with three different inactivation characteristic regions in the ASP-TiO2-K system.
KW - Annular slurry reactor
KW - E. coli
KW - Hom kinetics model
KW - Inactivation kinetics
KW - Photo-disinfection
KW - TiO2
UR - http://www.scopus.com/inward/record.url?scp=79957596847&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2011.03.024
DO - 10.1016/j.cej.2011.03.024
M3 - Article
AN - SCOPUS:79957596847
SN - 1385-8947
VL - 171
SP - 16
EP - 23
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
IS - 1
ER -