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http://dx.doi.org/10.11001/jksww.2021.35.3.227

Kinetic examination on synergistic effect of co-use of ultrasonic wave and ultraviolet radiation on bacterial disinfection in a household humidifier  

Kim, Seunga (Department of Civil and Environmental Engineering, Yonsei University)
Kim, Jihyun (Department of Civil and Environmental Engineering, Yonsei University)
Lee, Minjoo (Department of Civil and Environmental Engineering, Yonsei University)
Kim, Jayun (Department of Civil and Environmental Engineering, Yonsei University)
Jung, Woosik (Department of Civil and Environmental Engineering, Yonsei University)
Park, Joonhong (Department of Civil and Environmental Engineering, Yonsei University)
Publication Information
Journal of Korean Society of Water and Wastewater / v.35, no.3, 2021 , pp. 227-235 More about this Journal
Abstract
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-1(CFU/mL)-1. When UV and UW were applied together, however and interestingly, the disinfection rate constant (0.0211 min-1(CFU/mL)-1) 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.
Keywords
Household humidifier; Ultrasonic wave; Ultraviolet radiation; Tap-water; Bacterial disinfection;
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