비접촉식 자외선 살균 모델의 개발과 설계인자에 관한 연구

Abstract

Now a days, disinfection of effluent from wastewater treatment plant is obligation. Ultraviolet(UV) disinfection is one of the useful alternative compared to any other disinfection technology including chlorination. UV is easy to install and maintain. But the decrease of performance accompanied with fouling on the lamp of quartz sleeve is the most common and fatal defect of UV in water disinfection system. To overcome this fouling, non-contact type UV disinfection system which is fundamentally fouling-free is proposed in this study. The purpose of this study is verifying its feasibilities by simulating mathematical model. Based on optical laws and other UV distribution models, a detailed mathematical model for a non-contact type UV disinfection system was developed in this study. Optical properties of refraction, reflection and absorption of UV light were included in this model and reflection of ceiling wall was added. The followings were obtained as results. The average UV intensity of the water layer of the non-contact system is lower than that of the submerged system. The non-contact system required a 2 times more powerful lamp or one that had 2 times longer exposure time. A high-reflective ceiling wall is of use for disinfection in a non-contact system. Depending on design, the high-reflective ceiling wall can increase UV intensity of the water layer as much as several tens of percent. Most submerged lamp system have a fundamental fouling problem and due to the absorption of UV light by fouling materials on the quartz sleeve, germicidal power of UV light is drastically diminished. Therefore, considering the fouling attenuation, non-contact type of UV disinfection system deserves to be practically considered.