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Effect of Ultraviolet Disinfection on Drinking Water Microbial Inactivation and Biological Stability

Author: SunZuo
Tutor: LiGuiBai;LvMou
School: Qingdao Technological University
Course: Municipal Engineering
Keywords: UV disinfection Photoreactivation Inactivated Synergistic disinfection AOC MAP
CLC: TU991.2
Type: Master's thesis
Year: 2009
Downloads: 103
Quote: 1
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Abstract


Disinfection technology to the important part of the water treatment process, chlorine disinfection is the primary disinfection technology at home and abroad, but \pressing problems. The ultraviolet (UV) disinfection as a green, efficient, economic disinfection process increasingly attentions. Due to their wide kill bacteria, viruses, bacterial spores and protozoan oocysts, high efficiency, high speed, without adding chemicals, does not produce disinfection byproducts, UV disinfection technology is expected to become, with its variety of advantages instead of chlorine disinfection emerging disinfection technology. Domestic less basic research for ultraviolet disinfection, the purpose of the experiment is to provide a theoretical foundation for the research and technical application of UV disinfection. The paper selected E. coli, the Huangpu River raw water study, the effects of ultraviolet disinfection inactivation of microorganisms in water photoreactivation effect and characteristics; orthogonal design UV and chlorine the when chloramine joint disinfection microorganisms destroy live photoreactivation effect of microorganisms in water stability. The experiments showed that the E. coli inactivation rate increased with increasing UV dose, and the same dose of high-intensity ultraviolet inactivation of E. coli in the low-intensity ultraviolet. When the UV intensity 0.153mw/cm 2, the UV dose of 60mJ/cm ~ 2, the E. coli inactivation rate up 5log. UV dose, strength, and intensity of sunlight will affect the UV photoreactivation ability of E. coli in visible light: high UV dose control E. coli resurrection power superior to low UV doses, dose 120mJ/cm ~ 2 compared to the dose 5mJ / cm ~ 2 UV irradiation, E. coli photoreactivation rate can be reduced more than 1.5log; certain UV dose, high UV intensity irradiation conducive to control the level of E. coli photoreactivation; addition, the high intensity of sunlight will promote E. coli and resurrection. Therefore, the use of high-intensity or high doses of ultraviolet radiation, to avoid the daylight lighting are conducive to reducing the rate of bacterial resurrection, to ensure the quality of drinking water. The mode of action of UV joint chlorine disinfection is a synergistic effect UV joint chloramine disinfection versa. Under the same experimental conditions, the UV. Chlorine disinfection effect than ultraviolet - Chloramine is slightly better, but greatly reduced compared to chlorine chloramine disinfection to produce trihalomethanes possibility for water security reasons, it is recommended that the use of UV-chloro amine joint disinfection methods. In research joint disinfection of water AOC MAP HPC effects of two joint disinfection of water MAP, the first impact of the HPC factors being equal, given the tiny changes in the MAP content may lead to the proliferation of microorganisms in the selection of joint disinfection MAP aquatic microbial stability can not be ignored.

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CLC: > Industrial Technology > Building Science > Municipal Engineering > Water supply project ( on the Water Works ) > Clean Water ( water treatment )
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