Submitted: 08 Jan 2022
Revision: 09 Mar 2022
Accepted: 06 Apr 2022
ePublished: 29 Jun 2022
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Avicenna J Environ Health Eng. 2022;9(1): 35-44.
doi: 10.34172/ajehe.2022.05

Scopus ID: 85135582670
  Abstract View: 466
  PDF Download: 294

Original Article

Removal of Microorganisms by UVC Radiation From the Air of Hospital

Maryam Dashti 1 ORCID logo, Abdollah Dargahi 2 ORCID logo, Hadi Sadeghi 1* ORCID logo, Mehdi Vosoughi 1,2 ORCID logo, Seyed Ahmad Mokhtari 1 ORCID logo

1 Department of Environmental Health Engineering, School of Health, Ardabil University of Medical Sciences, Ardabil, Iran
2 Social Determinants of Health Research Center, Ardabil University of Medical Sciences, Ardabil, Iran
*Corresponding Author: Corresponding author: Hadi Sadeghi, Email: , Email: hsadeghi1079@gmail.com


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. 0800). The samples were collected from indoor air of rooms before irradiation and after UVC(254 nm) irradiation for 20 and 480 minutes. The sample size of the study was determined to be 432 (216 fungi and 216 bacteria). The difference between the mean concentration of bioaerosols in the UVC radiation at two intervals (20 and 480 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 20 minutes of irradiation; however, complete removal of the bacteria such as Staphylococcus pneumoniae and Staphylococcus saprophyticus was observed after 480 minutes of UVC irradiation. Fungi, such as Alternaria, Stofelim, and Mucor had a 100% reduction after 20 minutes of UVC irradiation, and Rhizopus and Aspergillus fumigatus showed a 100% decrease after 480 minutes of UVC irradiation. Other isolated fungi such as Cladosporium, Penicillium, Aspergillus niger, Rhodotorula, and Alternaria showed a decrease of 75%-98.78%. 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.

Please cite this article as follows: Dashti M, Dargahi A, Sadeghi H, Vosoughi M, Mokhtari SA. Removal of microorganisms by uvc radiation from the air of hospital. Avicenna J Environ Health Eng. 2022; 9(1):35-44. doi:10.34172/ajehe.2022.05
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Abstract View: 467

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