Removal of virus aerosols by the combination of filtration and UV-C irradiation |
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Authors: | Min Shang Yadong Kong Zhijuan Yang Rong Cheng Xiang Zheng Yi Liu Tongping Chen |
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Affiliation: | 1. School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China2. Sichuan Solid Waste and Chemicals Management Center, Chengdu 610031, China3. Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China |
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Abstract: | ● The removal of virus aerosols by filtration and UV-C irradiation was proposed. ● The filtration efficiency for virus aerosols was affected by the filtration rate. ● The inactivation rate by UV-C was not linear with irradiation intensity or time. ● The virus trapped by filter material had a shielding effect on UV-C irradiation. The COVID-19 pandemic remains ever prevalent and afflicting—partially because one of its transmission pathways is aerosol. With the widely used central air conditioning systems worldwide, indoor virus aerosols can rapidly migrate, thus resulting in rapid infection transmission. It is therefore important to install microbial aerosol treatment units in the air conditioning systems, and we herein investigated the possibility of combining such filtration with UV irradiation to address virus aerosols. Results showed that the removal efficiency of filtration towards f2 and MS2 phages depended on the type of commercial filter material and the filtration speed, with an optimal velocity of 5 cm/s for virus removal. Additionally, it was found that UV irradiation had a significant effect on inactivating viruses enriched on the surfaces of filter materials; MS2 phages had greater resistance to UV-C irradiation than f2 phages. The optimal inactivation time for UV-C irradiation was 30 min, with higher irradiation times presenting no substantial increase in inactivation rate. Moreover, excessive virus enrichment on the filters decreased the inactivation effect. Timely inactivation is therefore recommended. In general, the combined system involving filtration with UV-C irradiation demonstrated a significant removal effect on virus aerosols. Moreover, the system is simple and economical, making it convenient for widespread implementation in air-conditioning systems. |
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Keywords: | Filtration system UV-C irradiation Virus aerosol Public health COVID-19 |
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