Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Kinetic analysis of E. coli disinfection using UV-LED

LED 광원 UV에 의한 대장균(E. coli) 소독의 속도론 해석

  • Kim, Kyeong-Rae (Department of Environmental Engineering, Hoseo University) ;
  • Chang, In-Soung (Department of Environmental Engineering, Hoseo University)
  • 김경래 (호서대학교 환경공학과) ;
  • 장인성 (호서대학교 환경공학과)
  • Received : 2021.11.16
  • Accepted : 2021.12.10
  • Published : 2021.12.15
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Abstract

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.

Keywords

Acknowledgement

본 연구는 중소벤처기업부의 연구비 지원으로 수행되었습니다(과제번호: S2712599).

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