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초음파와 자외선(UV) 동시 적용이 가정용 가습기 내 살균에 미치는 시너지 효과에 대한 반응속도론적 연구
김성아,김지현,이민주,김자연,정우식,박준홍,Kim, Seunga,Kim, Jihyun,Lee, Minjoo,Kim, Jayun,Jung, Woosik,Park, Joonhong 대한상하수도학회 2021 상하수도학회지 Vol.35 No.3
This study examined the effect of ultraviolet (UV) application on bacterial disinfection in a commercialized humidifier using ultrasonic wave (UW). To accurately examine disinfection kinetics in tap-water condition, tap-water was sterilized using a filter, and then inoculated with pure cultures of E. coli and P. putida with known viable counts. The disinfection kinetic characteristics were experimentally compared when UV alone, UW alone, and UW+UV together were applied in disinfecting the added bacteria in the commercialized humidifier. When UV alone was applied, bacterial disinfection kinetics followed a first-order decay reaction, and showed an approximately 10-time weaker disinfection compared to the typical UV disinfection in water treatment or wastewater treatment. When UW alone was applied, bacterial disinfection kinetics followed a second-order decay reaction with a low disinfection rate constant of 0.0002 min<sup>-1</sup>(CFU/mL)<sup>-1</sup>. When UV and UW were applied together, however and interestingly, the disinfection rate constant (0.0211 min<sup>-1</sup>(CFU/mL)<sup>-1</sup>) was approximately 100 times increased than that for the UW alone case. These results revealed that the co-use of UV and UW can provide synergistic effect on bacterial disinfection in a tap-water condition in household humidifiers.