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http://dx.doi.org/10.5322/JES.2006.15.7.677

Disinfection Characteristic of Sewage Wastewater Treatment Using Solar Light/TiO2 Film System  

Cho Il-Hyoung (Division of Environment, Strategy Engineering Co., Ltd.)
Lee Nae-Hyun (Division of Environment, Strategy Engineering Co., Ltd.)
An Sang-Woo (Environment Research Department, Korea Institute of Construction Technology)
Kim Young-Kyu (Department of Environmental Public Health, Yong In University)
Lee Seung-Mok (Division of Civil & Environmental Engineering, Kwandong University)
Publication Information
Journal of Environmental Science International / v.15, no.7, 2006 , pp. 677-688 More about this Journal
Abstract
Currently, the application of $TiO_2$ photocatalyst has been focused on purification and treatment of wastewater. However, the use of conventional $TiO_2$ slurry photocatalyst results in disadvantage of stirring during the reaction and of separation after the reaction. And the usage of artificial UV lamp has made the cost of photocatalyst treatment system high. Consequently, we studied that solar light/$TiO_2$ film system was designed and developed in order to examine disinfection characteristics of sewage wastewater treatment. The optimum conditions for disinfection such as solar light intensity, characteristic of sewage wastewater, amounts of $TiO_2$ and comparison of solar ligth/$TiO_2$ systems with UV light/$TiO_2$ system was examined. The results are as follows: (1) photocatalytic disinfection process with solar light in the presence of $TiO_2$ film more effectively killed total coliform (TC) than solar light or $TiO_2$ film absorption only. (2) The survival ratio of TC and residual ratio of organic material (BOD, CODcr) decreased with remain resistant material. (3) The survival ratio of TC and residual ratio of organic material (BOD, CODcr) decreased with the increase of amounts of $TiO_2$. (4) TC survival ratio decreased linearly with increasing UV light intensity. (5) The disinfection effect of solar light/$TiO_2$ slurry system decreased more than UV light/$TiO_2$ film systems. (6) The disinfection reaction followed first-order kinetics. We suggest that solar light instead of using artificial UV light was conducted to investigate the applicability of alternative energy source in the disinfection of TC and the degradation of organic material.
Keywords
Light/$TiO_2$ film systems; Disinfection; Sunlight; UV lamp;
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