Performance of photocatalytic lamps on reduction of culturable airborne microorganism concentration |
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Authors: | Chuaybamroong Paradee Thunyasirinon Chuleewan Supothina Sitthisuntorn Sribenjalux Pipat Wu Chang-Yu |
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Affiliation: | a Department of Environmental Science, Faculty of Science and Technology, Thammasat University, Thailand b Ph.D. Program in Public Health, Khon Kaen University, Thailand c National Metal and Materials Technology Center (MTEC), National Science and Technology Development Agency, Thailand d Centre for Research and Development of Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences, Khon Kaen University, Thailand e Department of Environmental Engineering Sciences, University of Florida, Gainesville, FL, USA |
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Abstract: | Reduction of viable airborne Staphylococcus epidermidis and Aspergillus niger spore concentrations using two types of photocatalytic fluorescent lamps under controlled environmental conditions (25 vs. 35 °C and 55 vs. 75% relative humidity) were investigated. Visible white-light and UVA black light were in-house spray-coated with TiO2 and then compared with a commercially coated visible white-light for microbial concentration reduction. The white-light photocatalytic lamps reduced the concentration of culturable S. epidermidis up to 92% independent of temperature or humidity change, while the black light photocatalytic lamps completely inactivated the culturable bacteria at 25 °C, 55% relative humidity. Humidity seemed to alleviate UVA damage since better bacteria survival was found. For A. niger spores, rising humidity or temperature could lower their concentration or drop their culturabilities so that a difference between the natural decay and photocatalytic disinfection could not be distinguished. Reductions of total bacteria and total fungi concentrations using these lamps were also examined under uncontrolled environmental conditions in an office and a waste-storage room. It was found that photocatalytic lamps could reduce total culturable bacteria concentration from 9 to 97% and total culturable fungi concentration from 3 to 95% within irradiation time of 30-480 min, respectively. Insignificant difference in concentration reduction among these photocatalytic lamps was pronounced. |
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Keywords: | Bioaerosol Photocatalytic oxidation (PCO) Disinfection lamp A. niger S. epidermidis |
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