Removal of Microorganisms by UVC Radiation From the Air of Hospital
محل انتشار: مجله مهندسی بهداشت محیط، دوره: 9، شماره: 1
سال انتشار: 1401
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 129
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شناسه ملی سند علمی:
JR_AJEHE-9-1_005
تاریخ نمایه سازی: 28 تیر 1402
چکیده مقاله:
Currently, UVC radiation is used in hospitals to eliminate microorganisms and reduce adverse health
effects in operating rooms (ORs) and protective environment rooms (PERs). The purpose of this study
was to investigate the effect of UVC irradiation on bioaerosols in ORs and PERs. This experimental study
was performed in ORs and PERs in a hospital. Bioaerosols were evaluated according to the National
Institute for Occupational Safety and Health (NIOSH) standard (No. ۰۸۰۰). The samples were collected
from indoor air of rooms before irradiation and after UVC (۲۵۴ nm) irradiation for ۲۰ and ۴۸۰ minutes. The
sample size of the study was determined to be ۴۳۲ (۲۱۶ fungi and ۲۱۶ bacteria). The difference between
the mean concentration of bioaerosols in the UVC radiation at two intervals (۲۰ and ۴۸۰ minutes) was
significant, which indicates a decrease in the concentration of bioaerosols by increasing the duration of
UVC radiation. Some bacteria, such as group B Streptococcus, Lactobacillus, and Listeria, were entirely
killed after ۲۰ minutes of irradiation; however, complete removal of the bacteria such as Staphylococcus
pneumoniae and Staphylococcus saprophyticus was observed after ۴۸۰ minutes of UVC irradiation. Fungi,
such as Alternaria, Stofelim, and Mucor had a ۱۰۰% reduction after ۲۰ minutes of UVC irradiation, and
Rhizopus and Aspergillus fumigatus showed a ۱۰۰% decrease after ۴۸۰ minutes of UVC irradiation. Other
isolated fungi such as Cladosporium, Penicillium, Aspergillus niger, Rhodotorula, and Alternaria showed
a decrease of ۷۵%-۹۸.۷۸%. The ultraviolet (UV) sensitivity of bacterial and fungal bioaerosols depends
strongly on their type. The results from this study may offer an important understanding of the control of
indoor bioaerosols using UVC irradiation and help abate the environmental impacts of airborne microbes.
کلیدواژه ها:
نویسندگان
Maryam Dashti
Department of Environmental Health Engineering, School of Health, Ardabil University of Medical Sciences, Ardabil, Iran
Abdollah Dargahi
Social Determinants of Health Research Center, Ardabil University of Medical Sciences, Ardabil, Iran
Hadi Sadeghi
Department of Environmental Health Engineering, School of Health, Ardabil University of Medical Sciences, Ardabil, Iran
Mehdi Vosoughi
Department of Environmental Health Engineering, School of Health, Ardabil University of Medical Sciences, Ardabil, Iran- Social Determinants of Health Research Center, Ardabil University of Medical Sciences, Ardabil, Iran