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The hygienic principles of using bactericial ultraviolet monochrome led irradiators of the open type for premises air disinfecting

The hygienic principles of using bactericial ultraviolet monochrome led irradiators of the open type for premises air disinfecting

ISSN 2223-6775 Ukrainian journal of occupational health Vol.18, No 3, 2022


https://doi.org/10.33573/ujoh2022.03.216

The hygienic principles of using bactericial ultraviolet monochrome led irradiators of the open type for premises air disinfecting

Nazarenko V.I.1, Cherednichenko I.M.1, Leonov Yu.I.1, Pochta V.N.2, Shevchenko A.V.3, Burdeina N.B.4, Yarygin A.V.5
1State Institution «Kundiiev Institute of Occupational Health of the National Academy of Medical Sciences of Ukraine», Kyiv
2LLC «LED Azimut», Kamianske, Dnipropetrovsk region
3LLC «Kyivska Rus», Dnipro
4Kyiv National University of Construction and Architecture, Kyiv
5SI "Institute of Public Health named after O.M. Marzeev of the National Academy of Sciences of Ukraine", Kyiv


 Full article (PDF), ENG

Introduction. The use of modern LED sources of bactericidal UV radiation is a promising direction for improving the air quality in different premises. In Ukraine and the world, there are standards for the use of bactericidal UV radiation to disinfect indoor air and surfaces, but there is a need for hygienic regulation of the use of open-type UV irradiators.

The purpose of the study is to determine the hygienic principles of using bactericidal ultraviolet monochrome light-emitting diode (LED) irradiators of the open type for air disinfection in rooms of various purposes.

Research materials and methods. Instrumental measurements of the intensity of ultraviolet radiation and evaluation of the photobiological safety of the ultraviolet monochrome LED irradiator of the open type UVC T5-5W-275NM were carried out in accordance with DSTU EN 62471:2017, taking into account the coefficient of biological action in the range of 210–310 nm, the exposure limit value (ELV) of UV radiation was calculated for human skin and eye and doses of 90.0% and 99.9% bactericidal action for the most common biological pathogens: Influenza viruses, Streptococcus viridans, Corynebacterium diphtheria, Staphylococcus aureus, Mycobacterium tuberculosis.

The results. The measurement results show that, in accordance with the safety criteria set by DSTU EN 62471, a person is allowed to stay at a distance of more than 2 m from the LED irradiator (UVC T5-5W-275NM) for 8 hours. At a distance of 1.0 m from a working LED irradiator, the time of stay is permissible, taking into account risks of dangerous effects on the skin and eyes should not exceed 60 min. The main condition for the use of open sources of UV radiation is that the effective bactericidal dose should not exceed the effective exposure limit value for human skin and eyes according to DSTU EN 62471:2017.

Conclusions. Ultraviolet bactericidal open-type LED irradiator UVC T5-5W-275NM is a source of monochrome UV radiation, subject to assessment of exposure risks for human skin and eyes according to DSTU EN 62471:2017 "Safety of lamps and lamp systems photobiological". The main condition for the use of open sources of UV radiation is that the effective bactericidal dose should not exceed the exposure limit value (ELV) 30 J/m2 according to DSTU EN 62471:2017.

When developing recommendations for the use of UV radiation sources in premises in the presence of people, it is necessary to take into account the specific sensitivity of microorganisms to UV radiation and its selected level of bactericidal efficiency. To disinfect Influenza viruses, Streptococcus viridans, Corynebacterium diphtheria, Staphylococcus aureus, with a bactericidal effect of 99.9%, it is advisable to use monochrome LED UV emitters of the open type with a wavelength of 230 nm. With the aim of 99.9% bactericidal effect in the case of the SARS-CoV-2, in the presence of a person, it is advisable to use open sources of UV radiation with a wavelength of 220-290 nm.

Keywords: hygienic principles, bactericidal ultraviolet monochrome LED emitters of open type, indoor air disinfection.

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