Study of the effectiveness of the use of closed-type UV-recirculators for air disinfection in enclosed space

Introduction. The research is devoted to assessing the results of our studies of indoor air concerning microbial contamination during the operation of a UV recirculator with different modes (different UV doses). Also, a theoretical calculation of the influence of the ratio of the capacity of the UV recirculator to the air volume of the treated room on the efficiency of air disinfection has been made.

Materials and methods. The study of indoor air in terms of total bacterial count (TBC), including coccal microflora and yeast and mould fungi, were carried out. Air sampling and evaluation were carried out under the requirements of Methodical guidelines MUK 4.2.2942-11 “Methods of sanitary and bacteriological studies of environmental objects, air and sterility control in medical institutions”. The evaluation of the results was carried out following R 3.5.1904-04, "The use of ultraviolet bactericidal radiation for disinfection of indoor air". During the study, agar culture media were used: Sabouraud agar, yolk-salt agar (YSA), meat-peptone agar (MPA), nutrient agar with the addition of 5% sheep blood (blood agar), bismuth sulfite agar, XLD-agar, cetrimide-agar, “Shine” agar, Endo agar.

Results. As a result of the studies carried out, it was shown that a dose of UV irradiation of the order of 12-15 mJ/cm² leads to an insignificant change in the concentration of bacteria (TBC) and fungi in the air (the efficiency was 58% and 69%, respectively). UV doses of the order of 25-30 mJ/cm² significantly reduce the concentration of bacteria (TBC) and fungi in the air (efficiency was 99.99% and 99.4%, respectively). A theoretical calculation showed that it is practical to use a UV recirculator of such a capacity that provides an air exchange rate in the room of at least 4 (with ventilation operating at a rate of at least 2).

Conclusion. To effectively use UV recirculators in enclosed spaces against bacteria and fungi, it is necessary to use models that provide a UV dose of at least 25-30 mJ/cm². In contrast, their air capacity should provide an air exchange rate of at least 4.

Contribution:
Vasilev A.I. — the concept and design of the study;
Zagainova A.V. — the concept and design of the study, collection and processing of material, statistical processing, writing a text;
Gritsyuk O.V. — collection and processing of material;
Kurbatova I.V., Abramov I.A. — collection and processing of material, writing a text;
Tkachev A.A. — statistical processing, writing a text;
Kostyuchenko S.V., Yudin S.M. — editing.
All authors are responsible for the integrity of all parts of the manuscript and approval of the manuscript final version.

Conflict of interest. Financial interest in the marketing of the described medical equipment (employee of the manufacturing company) from some authors.

Acknowledgement. Published as an advertisement

Received: August 31, 2021 / Accepted: September 28, 2021 / Published: November 30, 2021