논문 상세보기
pp.677-688
Currently, the application of TiO2 photocatalyst has been focused on purification and treatment of wastewater. However, the use of conventional TiO2 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/TiO2 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 TiO2 and comparison of solar ligth/TiO2 systems with UV light/TiO2 system was examined. The results are as follows: (1) photocatalytic disinfection process with solar light in the presence of TiO2 film more effectively killed total coliform (TC) than solar light or TiO2 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 TiO2. (4) TC survival ratio decreased linearly with increasing UV light intensity. (5) The disinfection effect of solar light/TiO2 slurry system decreased more than UV light/TiO2 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.
