Photocatalytic disinfection of marine bacteria using fluorescent light

WATER RESEARCH

卷:42

Article

Leung, T. Y.¹  Chan, C. Y.²  Hu, C.³  Yu, J. C.⁴  Wong, P. K.^1,5 

[1] Chinese Univ Hong Kong, Dept Biol, Shatin, Hong Kong, Peoples R China

[2] Chinese Univ Hong Kong, Dept Microbiol, Shatin, Hong Kong, Peoples R China

[3] Chinese Acad Sci, Ecoenvironm Sci Res Ctr, Beijing 100085, Peoples R China

[4] Chinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong, Peoples R China

[5] Chinese Univ Hong Kong, Environm Sci Programme, Shatin, Hong Kong, Peoples R China

关键词: Photocatalytic oxidation;    Bacterial inactivation;    Fluorescent light;    Marine bacteria;   

DOI  :  10.1016/j.watres.2008.08.031

来源: Elsevier

【 摘 要 】

Photocatalytic oxidation (PCO) using fluorescent light was used to disinfect two marine bacteria: Alteromonas alvinellae and Photobacterium phosphoreum. Results showed that P. phosphoreum exhibited a lower susceptibility towards PCO than A. alvinellae, which was related to their fatty acid profiles and levels of superoxide dismutase (SOD) and catalase (CAT). Results also revealed that CAT and SOD levels would be triggered by PCO reaction. In addition, PCO disinfection efficiency could be enhanced by acidic pH levels and increased temperatures, while different growth phases demonstrated diverse effects to the studied bacteria, probably due to their morphological difference or change in physiological state. Lastly intracellular leakage of potassium ion (K+), in line with the loss of cell viability, was observed during PCO. Mineralization of bacteria by PCO was monitored by total organic carbon analysis. From the regrowth study, the tested strains failed to reactivate within 96 h after PCO treatment, indicating PCO caused irreversible bacterial inactivation. (C) 2008 Elsevier Ltd. All rights reserved.

【 授权许可】

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