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Disinfection of wastewater bacteria by photocatalytic oxidation.

So, Wai Man. / Thesis submitted in: October 2007. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2008. / Includes bibliographical references (leaves 112-124). / Abstracts in English and Chinese. / Acknowledgements --- p.i / Abstract --- p.ii / Table of Contents --- p.vi / List of Figures --- p.x / List of Plates --- p.viii / List of Tables X --- p.v / Abbreviations --- p.xvii / Equations --- p.xix / Chapter 1. --- Introduction --- p.1 / Chapter 1.1 --- Importance of water disinfection --- p.1 / Chapter 1.2 --- Conventional disinfection methods --- p.2 / Chapter 1.2.1 --- Chlorination --- p.2 / Chapter 1.2.2 --- Ozonation --- p.3 / Chapter 1.2.3 --- Ultraviolet-C (UV-C) irradiation --- p.4 / Chapter 1.2.4 --- Sunlight irradiation --- p.5 / Chapter 1.2.5 --- Others --- p.6 / Chapter 1.3 --- Photocatalytic oxidation --- p.7 / Chapter 1.3.1 --- Reactions in PCO --- p.8 / Chapter 1.3.2 --- Disinfection mechanism of PCO --- p.11 / Chapter 1.3.3 --- Photocatalysts --- p.14 / Chapter 1.3.3.1 --- Titanium dioxide (TiO2) --- p.14 / Chapter 1.3.3.2 --- Modification of TiO2 --- p.15 / Chapter 1.3.3.2.1 --- Sulphur cation-doped TiO2 (S-TiO2) --- p.17 / Chapter 1.3.3.2.2 --- Copper(I) oxide-sensitized P-25 (Cu20/P-25) --- p.18 / Chapter 1.3.3.2.3 --- Silicon dioxide-doped TiO2 (SiO2-TiO2) --- p.18 / Chapter 1.3.3.2.4 --- Nitrogen-doped TiO2 (N-TiO2) --- p.19 / Chapter 1.4 --- Bacterial defense systems against oxidative stress --- p.20 / Chapter 1.5 --- Bacterial species --- p.22 / Chapter 1.5.1 --- Salmonella typhimurium --- p.23 / Chapter 1.5.2 --- Klebsiella pneumoniae --- p.24 / Chapter 1.5.3 --- Bacillus thuringiensis --- p.25 / Chapter 1.5.3 --- Bacillus pasteurii --- p.26 / Chapter 2. --- Objectives --- p.27 / Chapter 3. --- Material and Methods --- p.28 / Chapter 3.1 --- Culture media and diluents --- p.28 / Chapter 3.2 --- Screening of target bacteria --- p.28 / Chapter 3.3 --- PCO disinfection reaction --- p.29 / Chapter 3.3.1 --- Photocatalysts --- p.29 / Chapter 3.3.2 --- Bacterial cultures --- p.31 / Chapter 3.3.3 --- PCO reactor --- p.32 / Chapter 3.3.4 --- PCO efficacy test --- p.34 / Chapter 3.3.5 --- Comparison of different photocatalysts --- p.35 / Chapter 3.4 --- Optimization of PCO disinfection conditions --- p.35 / Chapter 3.5 --- Transmission electron microscopy (TEM) --- p.39 / Chapter 3.6 --- Superoxide dismutase (SOD) activity assay --- p.42 / Chapter 3.7 --- Catalase (CAT) activity assay --- p.44 / Chapter 3.8 --- Spore staining --- p.45 / Chapter 3.9 --- Atomic absorption spectrophotometry (AAS) --- p.45 / Chapter 3.10 --- X-ray photoelectron spectrometry (XPS) --- p.46 / Chapter 4. --- Results --- p.47 / Chapter 4.1 --- Screening of wastewater bacteria --- p.47 / Chapter 4.2 --- PCO efficacy test --- p.49 / Chapter 4.3 --- PCO under visible light irradiation --- p.53 / Chapter 4.3.1 --- Fluorescence lamps with UV filter --- p.53 / Chapter 4.3.2 --- Solar lamp with UV filter --- p.61 / Chapter 4.3.3 --- Sunlight with UV filter --- p.67 / Chapter 4.4 --- Optimization of PCO disinfection conditions --- p.75 / Chapter 4.4.1 --- Effect of visible light intensities --- p.75 / Chapter 4.4.2 --- Effect of photocatalyst concentrations --- p.77 / Chapter 4.4.3 --- Optimized conditions --- p.79 / Chapter 4.5 --- Transmission electron microscopy (TEM) --- p.79 / Chapter 4.6 --- Superoxide dismutase (SOD) activity assay --- p.83 / Chapter 4.7 --- Catalase (CAT) activity assay --- p.84 / Chapter 4.8 --- Spore staining --- p.85 / Chapter 4.9 --- Studies on Cu20/P-25 --- p.88 / Chapter 4.9.1 --- Atomic absorption spectrophotometry (AAS) --- p.88 / Chapter 4.9.2 --- X-ray photoelectron spectrometry (XPS) --- p.88 / Chapter 5. --- Discussion --- p.90 / Chapter 5.1 --- Screening of wastewater bacteria --- p.90 / Chapter 5.2 --- PCO efficacy test --- p.90 / Chapter 5.3 --- Comparison between different light sources --- p.90 / Chapter 5.4 --- Comparison between different photocatalysts --- p.93 / Chapter 5.5 --- Optimization of PCO disinfection conditions --- p.95 / Chapter 5.5.1 --- Effect of visible light intensities --- p.95 / Chapter 5.5.2 --- Effect of photocatalyst concentrations --- p.96 / Chapter 5.6 --- Transmission electron microscopy (TEM) --- p.97 / Chapter 5.7 --- Comparison between different bacterial species --- p.99 / Chapter 5.8 --- Possible factors affecting susceptibility of bacteria towards PCO --- p.99 / Chapter 5.8.1 --- Formation of endospores --- p.99 / Chapter 5.8.2 --- Differences in cell wall structure --- p.100 / Chapter 5.8.3 --- SOD and CAT activities --- p.101 / Chapter 5.9 --- Dark control of Cu20/P-25 --- p.103 / Chapter 5.10 --- Studies on Cu20/P-25 --- p.104 / Chapter 6. --- Conclusion --- p.107 / Chapter 7. --- References --- p.112 / Chapter 8. --- Appendix --- p.125 / Chapter 8.1 --- Production of S-Ti02 --- p.125 / Chapter 8.2 --- Production of Si02-Ti02 --- p.125 / Chapter 8.3 --- Production of N-Ti02 --- p.125

Identiferoai:union.ndltd.org:cuhk.edu.hk/oai:cuhk-dr:cuhk_326215
Date January 2008
ContributorsSo, Wai Man., Chinese University of Hong Kong Graduate School. Division of Biology.
Source SetsThe Chinese University of Hong Kong
LanguageEnglish, Chinese
Detected LanguageEnglish
TypeText, bibliography
Formatprint, xix, 125 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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