Controlling Indoor Bioaerosols Using a Hybrid System of Ozone and Catalysts

doi:10.4209/aaqr.2011.07.0098

CNU IR > College of Sustainable Environment and Recreation > Dept. of Occupational Safety > Periodical Articles > Item 310902800/27688

Please use this identifier to cite or link to this item: https://ir.cnu.edu.tw/handle/310902800/27688

Title:	Controlling Indoor Bioaerosols Using a Hybrid System of Ozone and Catalysts
Authors:	Huang, Hsiao-Lin Lee, Mei-Guei Tai, Jen-Hsuan
Contributors:	職業安全衛生系
Keywords:	Disinfection Indoor Air Quality Biohazard Germicidal Efficacy Microorganism
Date:	2012-02
Issue Date:	2014-03-21 16:17:42 (UTC+8)
Publisher:	Taiwan Assoc Aerosol Res-Taar
Abstract:	As people spend a greater portion of their time indoors, the likelihood of exposure to biohazards in indoor air is increasing. This study developed a system to disinfect indoor bioaerosols while protecting occupants from direct exposure to ozone. This hybrid approach combines high concentrations of ozone generated by a non-thermal dielectric barrier discharge system, and an ozone decomposition unit using MnO2/Al2O3 and MnO2/AC catalysts. Four types of common bioaerosols were used to test the germicidal efficacy of 0-175 ppm ozone at a relative humidity of 30-70% and retention time of 1-10 s. The results indicate that the germicidal efficacy of ozone on E. coli, C. famata and P. citrinum spore bioaerosols increased with ozone concentration, relative humidity, and retention time; however, the process was less effective with the hardy endospores of B. subtilis. Germicidal efficacy of 90% was obtained for bioaerosols (two vegetative cells and one spore) using high concentrations of ozone at a relative humidity of 70% and exposure time of 10 s. Residual ozone in the tail gas was decomposed to undetectable levels using catalysts at a gas hourly space velocity of 3.287 x 10(3) 1/h. The concentration of indoor bioaerosols (total bacteria and fungi) in a small office was reduced to below 50 CFU/m(3) and ozone in the tail gas was reduced to undetectable levels following treatment for 2 h. The hybrid system of ozone disinfection and catalysts provides high germicidal efficacy while protecting occupants from direct exposure to ozone.
Relation:	Aerosol And Air Quality Research, 12(1), 73-82
Appears in Collections:	[Dept. of Occupational Safety] Periodical Articles

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