Water disinfection using UV-LED(Light emitting diode) has many advantages, such as smaller footprint and power consumption as well as relatively longer lifespan than those of conventional mercury-UV lamps. Moreover, UV-LED disinfection is considered an environmentally benign process due to its mercury-free nature. In this study, disinfection using an LED module emitting 275nm UV was carried out. 384 UV-LEDs were put into a cylinder tube with a capacity of 1.7 liters. The UV intensity of the UV-LED module was controlled from 1.7 to 8.4 mW/cm2. The disinfection efficiency for the model microorganism solutions(E. coli ) was monitored. As the UV intensity(I) and contact time(t) varied, inactivation of the microorganisms from 2 to 4-log-removals(i.e., 99 to 99.99% of disinfection efficiency) was achieved. Disinfection using UV-LED was followed to 1st order reaction and the reaction rate constant, k was determined. In addition, the relationship between UV intensity(I) and contact time(t) in order to obtain 99.99% of disinfection efficiency was modeled: I1.2∙𝑡= 460, which indicates that the product of UV intensity and contact time requiring 4-log-removals is always constant.

ABSTRACT
1. 서 론
2. 실험 장치 및 방법
    2.1 소독대상 미생물
    2.2 미생물 균체 수 측정
    2.3 UV-LED 소독 장치
    2.4 미생물 소독의 속도론 해석
3. 결과 및 고찰
    3.1 대장균 초기 균체량에 따른 사멸률 변화
    3.2 UV-LED 소독의 반응차수 해석
    3.3 자외선 조사강도(I)와 접촉시간(t)에 따른 소독 인자 모델링
4. 결 론
References

• 김경래(호서대학교 환경공학과) | Kyeong-Rae Kim (Department of Environmental Engineering, Hoseo University)
• 장인성(호서대학교 환경공학과) | In-Soung Chang (Department of Environmental Engineering, Hoseo University) Corresponding author