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Efficacy of Photocatalytic HEPA Filter on Reducing Bacteria and Fungi Spores in the Presence of UVC and UVA Lights | ||
| Pollution | ||
| دوره 7، شماره 2، تیر 2021، صفحه 309-319 اصل مقاله (1.01 M) | ||
| نوع مقاله: Original Research Paper | ||
| شناسه دیجیتال (DOI): 10.22059/poll.2021.311399.916 | ||
| نویسندگان | ||
| Tahereh Mousavi1؛ Farideh Golbabaei* 1؛ Mehrdad Helmi Kohneshahri1؛ Mohammad Reza Pourmand2؛ Sassan Rezaie3؛ Mostafa Hosseini4؛ Ali Karimi1 | ||
| 1Department of Occupational Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran | ||
| 2Department of Pathobiology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran | ||
| 3Department of Parasitology and Mycology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran | ||
| 4Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran | ||
| چکیده | ||
| The Indoor Air Quality (IAQ) of a hospital is very important to properly protect both patients and the staff against hospital infections. The present study aims at evaluating the efficiency of photocatalytic filters as well as the impact of important factors such as the type of UV wavelength (UVC, UVA) with different intensities and loading rates of TiO2 in HEPA Filters on reducing airborne microorganisms. For so doing, it has prepared photocatalytic filters by dipping them into 2% and 4% titanium dioxide suspensions as low and high loading, respectively. The experiments have been carried out on four species’ microorganisms, namely Epidermidis, Subtilis, Niger, and Penicillium. Fungi and bacteria suspensions have been prepared with concentrations of 106, 107 CFU/m3, respectively. In terms of microorganism removal, the efficiency of HEPA filters in both types of TiO2 loading and UVC and UVA radiations with two intensities at three times intervals (60, 90, and 120 min) have been investigated. Results show that lower penetration microorganism belong to PCO (TiO2 + UV), compared to photolysis (UV alone) at all intervals of UV radiation. TiO2 loading has no significant effect on percentage removal in all microorganisms. The percentage penetration of microorganisms under UVC radiation is lower than UVA radiation. Also, increasing the radiation intensity in both types of UV shows that it has higher effectiveness for removing bacteria and fungi. Therefore, the use of photocatalytic HEPA filters with UVC radiation can play an influential role in reduction of the microorganisms in different places such as hospitals, cleanrooms, etc. | ||
| کلیدواژهها | ||
| Photocatalytic oxidation؛ photolysis؛ Airborne microorganisms؛ High efficiency particulate air Filter؛ UV radiation | ||
| مراجع | ||
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