Disinfection efficiency of hospital infectious disease wards with chlorine dioxide and hypochlorous acid
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ORIGINAL PAPER
Disinfection efficiency of hospital infectious disease wards with chlorine dioxide and hypochlorous acid Ming-Chun Lu . Po-Lin Chen . Da-Ji Huang . Chih-Kuo Liang . Ching-Shan Hsu . Wei-Ting Liu
Received: 17 August 2019 / Accepted: 22 October 2020 Ó Springer Nature B.V. 2020
Abstract The disinfection efficiencies of two chemical disinfectants, chlorine dioxide and weak acid hypochlorous water (WAHW), were examined in the soiled room and dishwashing room of a hospital infectious disease ward in Taiwan. The investigations were conducted in two seasons, namely winter and summer, in order to examine the correlation between the bioaerosol concentration and the environmental factors. In addition, a single-daily disinfection mode (SM) and a twice-daily disinfection mode (TM) were applied in this study. The results showed that the bacteria and fungi colony counts were strongly correlated with the temperature. Both disinfectants reduced the bacteria and fungi concentrations in the considered rooms. However, of the two disinfectants, the ClO2 showed a stronger disinfection effect than the WAHW. It means that when using ClO2 as the
M.-C. Lu D.-J. Huang C.-S. Hsu (&) W.-T. Liu Department of Environmental Resources Management, Chia-Nan University of Pharmacy and Science, Tainan 71710, Taiwan e-mail: [email protected] P.-L. Chen Center for Infection Control and Department of Internal Medicine, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan 70101, Taiwan C.-K. Liang Department of Electrical Engineering, National Taitung Junior College, Taitung 95045, Taiwan
disinfectant, the disinfection efficiency of the TM treatment mode is significantly better than that of the SM treatment mode. But, when using WAHW as the disinfectant, no significant difference is found between the disinfection efficiencies of the two methods. Overall, the results showed that the application of ClO2 twice daily provided the most effective means of satisfying the Taiwan EPA guidelines for the indoor air quality of hospital medical wards. Keywords Disinfectant Chlorine dioxide Weak acid hypochlorous water Ward Bioaerosols
1 Introduction In hospital buildings, there is a fertile breeding ground for many medical disorders, including allergies, asthma and infectious diseases (ACGIH 1999). Hospital wards are closed spaces and are therefore at a very high risk of microbial contamination. The bioaerosols containing pathogenic bacteria in the environment of hospital buildings put patients and even hospital personnel into a dangerous situation (Abreu et al. 2013). Due to the risk may happen in the hospital, there were many studies investigated the airborne bioaerosols and their impacts on the indoor air quality in hospital wards (Beggs 2003; Bhalla et al. 2004; Boyce 2007; Maclean et al. 2015; Dancer 2009).
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Aerobiologia
The total bioaerosol particles in indoor environments should be less than 1000 CFU/m3 according to the Na
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