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Design and performance evaluation of a photocatalytic reactor for indoor air disinfection
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Design and performance evaluation of a photocatalytic reactor for indoor air disinfection
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Design and performance evaluation of a photocatalytic reactor for indoor air disinfection
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Journal Article
Design and performance evaluation of a photocatalytic reactor for indoor air disinfection
2021
Overview
Since COVID-19 pandemic, indoor air quality control has become a priority, and the development of air purification devices effective for disinfecting airborne viruses and bacteria is of outmost relevance. In this work, a photocatalytic device for the removal of airborne microorganisms is presented. It is an annular reactor filled with TiO
2
-coated glass rings and irradiated internally and externally by UV-A lamps.
B. subtilis
spores and vegetative cells have been employed as model biological pollutants. Three types of assays with aerosolized bacterial suspensions were performed to evaluate distinct purification processes: filtration, photocatalytic inactivation in the air phase, and photocatalytic inactivation over the TiO
2
-coated rings. The radiation distribution inside the reactor was analysed by performing Monte Carlo simulations of photon absorption in the photocatalytic bed. Complete removal of a high load of microorganisms in the air stream could be achieved in 1 h. Nevertheless, inactivation of retained bacteria in the reactor bed required longer irradiation periods: after 8 h under internal and external irradiation, the initial concentration of retained spores and vegetative cells was reduced by 68% and 99%, respectively. Efficiency parameters were also calculated to evaluate the influence of the irradiation conditions on the photocatalytic inactivation of bacteria attached at the coated rings.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
Subject
/ Advanced Oxidation/Reduction Technologies: An from Iberoamerican Countries
/ Advanced Oxidation/Reduction Technologies: An Perspective from Iberoamerican Countries
/ air
/ air flow
/ Atmospheric Protection/Air Quality Control/Air Pollution
/ Bacteria
/ Bed load
/ Coatings
/ COVID-19
/ Earth and Environmental Science
/ glass
/ photons
/ Reactors
/ Spores
