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Photocatalytic disinfection towards freshwater and marine bacteria using fluorescent light.

Leung, Tsz Yan. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2008. / Includes bibliographical references (leaves 132-146). / Abstracts in English and Chinese. / Acknowledgements --- p.i / Abstract --- p.ii / Table of Contents --- p.vii / List of Figures --- p.xii / List of Plates --- p.xiv / List of Tables --- p.xvii / Abbreviations --- p.xviii / Equations --- p.xxi / Chapter 1. --- Introduction --- p.1 / Chapter 1.1 --- Water crisis and water disinfection --- p.1 / Chapter 1.2 --- Common disinfection methods --- p.2 / Chapter 1.2.1 --- Chlorination --- p.2 / Chapter 1.2.2 --- Ozonation --- p.4 / Chapter 1.2.3 --- Ultraviolet-C (UV-C) irradiation --- p.6 / Chapter 1.2.4 --- Solar disinfection (SODIS) --- p.7 / Chapter 1.2.5 --- Mixed disinfectants --- p.9 / Chapter 1.2.6 --- Other disinfection methods --- p.10 / Chapter 1.3 --- Advanced oxidation processes (AOPs) --- p.11 / Chapter 1.4 --- Photocatalytic oxidation (PCO) --- p.13 / Chapter 1.4.1 --- Understanding of PCO process --- p.15 / Chapter 1.4.2 --- Proposed disinfection mechanism of PCO --- p.18 / Chapter 1.4.3 --- Titanium dioxide (Ti02) photocatalyst --- p.21 / Chapter 1.4.4 --- Irradiation sources --- p.22 / Chapter 1.4.5 --- Bacterial species --- p.23 / Chapter 1.4.5.1 --- Escherichia coli K12 --- p.23 / Chapter 1.4.5.2 --- Shigella sonnei --- p.24 / Chapter 1.4.5.3 --- Alteromonas alvinellae --- p.25 / Chapter 1.4.5.4 --- Photobacterium phosphoreum --- p.26 / Chapter 1.4.6 --- Bacterial defense mechanism towards oxidative stress --- p.27 / Chapter 1.4.6.1 --- Superoxide dismutase (SOD) activity --- p.28 / Chapter 1.4.6.2 --- Catalase (CAT) activity --- p.29 / Chapter 1.4.6.3 --- Fatty acid (FA) profile --- p.30 / Chapter 1.4.7 --- Significance of the project --- p.31 / Chapter 2. --- Objectives --- p.34 / Chapter 3. --- Material and Methods --- p.36 / Chapter 3.1 --- Chemicals --- p.36 / Chapter 3.2 --- Screening of freshwater and marine bacterial culture --- p.36 / Chapter 3.3 --- Photocatalytic reaction --- p.39 / Chapter 3.3.1 --- Preparation of reaction mixture --- p.39 / Chapter 3.3.2 --- Preparation of bacterial culture --- p.39 / Chapter 3.3.3 --- Photocatalytic reactor --- p.41 / Chapter 3.3.4 --- PCO disinfection reaction --- p.42 / Chapter 3.3.4.1 --- Effect of initial pH --- p.44 / Chapter 3.3.4.2 --- Effect of reaction temperature --- p.45 / Chapter 3.3.4.3 --- Effect of growth phases --- p.45 / Chapter 3.4 --- Measurement of superoxide dismutase (SOD) activity --- p.47 / Chapter 3.5 --- Measurement of catalase (CAT) activity --- p.49 / Chapter 3.6 --- Fatty acid (FA) profile --- p.50 / Chapter 3.7 --- Bacterial regrowth test --- p.51 / Chapter 3.8 --- Atomic absorption spectrophotometry (AAS) --- p.52 / Chapter 3.9 --- Total organic carbon (TOC) analysis --- p.53 / Chapter 3.10 --- Chlorination --- p.55 / Chapter 3.11 --- UV-C irradiation --- p.56 / Chapter 3.12 --- Transmission electron microscopy (TEM) --- p.56 / Chapter 4. --- Results --- p.60 / Chapter 4.1 --- Screening of UV-A resistant freshwater and marine bacteria --- p.60 / Chapter 4.2 --- Control experiments --- p.62 / Chapter 4.3 --- Treatment experiments --- p.65 / Chapter 4.3.1 --- UV-A irradiation from lamps --- p.65 / Chapter 4.3.2 --- Fluorescent light from fluorescent lamps --- p.65 / Chapter 4.3.3 --- Effect of initial pH --- p.67 / Chapter 4.3.4 --- Effect of reaction temperature --- p.70 / Chapter 4.3.5 --- Effect of growth phases --- p.70 / Chapter 4.4 --- Factors affecting bacterial sensitivity towards PCO --- p.73 / Chapter 4.4.1 --- Superoxide dismutase (SOD) and catalase (CAT) activities --- p.73 / Chapter 4.4.2 --- Superoxide dismutase (SOD) and catalase (CAT) induction --- p.74 / Chapter 4.4.3 --- Fatty acid (FA) profile --- p.75 / Chapter 4.5 --- Bacterial regrowth test --- p.78 / Chapter 4.6 --- Disinfection mechanisms of fluorescent light-driven photocatalysis --- p.79 / Chapter 4.6.1 --- Atomic absorption spectrophotometry (AAS) --- p.79 / Chapter 4.6.2 --- Total organic carbon (TOC) analysis --- p.81 / Chapter 4.6.3 --- Transmission electron microscopy (TEM) --- p.83 / Chapter 4.7 --- Chlorination --- p.89 / Chapter 4.7.1 --- Disinfection efficiency --- p.89 / Chapter 4.7.2 --- Transmission electron microscopy (TEM) --- p.92 / Chapter 4.8 --- UV-C irradiation --- p.96 / Chapter 4.8.1 --- Disinfection efficiency --- p.96 / Chapter 4.8.2 --- Transmission electron microscopy (TEM) --- p.96 / Chapter 5. --- Discussions --- p.103 / Chapter 5.1 --- Screening of UV-A resistant freshwater and marine bacteria --- p.103 / Chapter 5.2 --- Comparison of PCO coupled with UV-A lamps and fluorescent lamps --- p.103 / Chapter 5.3 --- Effect of initial pH --- p.105 / Chapter 5.4 --- Effect of reaction temperature --- p.106 / Chapter 5.5 --- Effect of growth phases --- p.107 / Chapter 5.6 --- Factors affecting bacterial sensitivity towards PCO --- p.108 / Chapter 5.6.1 --- Superoxide dismutase (SOD) and catalase (CAT) activities --- p.108 / Chapter 5.6.2 --- Superoxide dismutase (SOD) and catalase (CAT) induction --- p.110 / Chapter 5.6.3 --- Fatty acid (FA) profile --- p.110 / Chapter 5.6.4 --- Cell wall structure --- p.112 / Chapter 5.6.5 --- Bacterial size --- p.114 / Chapter 5.6.6 --- Other possible factors --- p.114 / Chapter 5.7 --- Bacterial regrowth test --- p.115 / Chapter 5.8 --- Disinfection mechanisms of fluorescent light-driven photocatalysis --- p.116 / Chapter 5.8.1 --- Atomic absorption spectrophotometry (AAS) --- p.116 / Chapter 5.8.2 --- Total organic carbon (TOC) analysis --- p.117 / Chapter 5.8.3 --- Transmission electron microscopy (TEM) --- p.118 / Chapter 5.9 --- Chlorination --- p.122 / Chapter 5.9.1 --- Disinfection efficiency --- p.122 / Chapter 5.9.2 --- Transmission electron microscopy (TEM) --- p.122 / Chapter 5.10 --- UV-C irradiation --- p.123 / Chapter 5.10.1 --- Disinfection efficiency --- p.123 / Chapter 5.10.2 --- Transmission electron microscopy (TEM) --- p.124 / Chapter 5.11 --- Comparisons of three disinfection methods --- p.124 / Chapter 6. --- Conclusions --- p.126 / Chapter 7. --- References --- p.132

Identiferoai:union.ndltd.org:cuhk.edu.hk/oai:cuhk-dr:cuhk_326576
Date January 2008
ContributorsLeung, Tsz Yan., Chinese University of Hong Kong Graduate School. Division of Biology.
Source SetsThe Chinese University of Hong Kong
LanguageEnglish, Chinese
Detected LanguageEnglish
TypeText, bibliography
Formatprint, xxi, 146 leaves : ill. (some col.) ; 30 cm.
RightsUse of this resource is governed by the terms and conditions of the Creative Commons “Attribution-NonCommercial-NoDerivatives 4.0 International” License (http://creativecommons.org/licenses/by-nc-nd/4.0/)

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