期刊
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
卷 23, 期 7, 页码 1846-1851出版社
KOREAN SOC MECHANICAL ENGINEERS
DOI: 10.1007/s12206-009-0613-z
关键词
Submicron aerosol particle; Bioaerosols; Particle charging; Fibrous medium
This paper reports the installation of a carbon fiber ionizer in front of a fibrous medium filter to enhance the removal of submicron aerosol particles and bioaerosols. Test particles (KCl) were classified with a size range of 50-600 nm using a differential mobility analyzer (DMA). The number concentration of the test particles was measured using a condensation particle Counter (CPC). The average charge per particle was estimated by current measurements using art aerosol electrometer. At the face velocity of 0.5 m/s, the particle removal efficiency was 31.4% (for d(p) = 100 nm) when the ionizers were not operating but increased to 35.7% and 46.9% at 1.6x10(11)ions/s and 6.4x10(12)ions/s with the ionizers, respectively. For the antibacterial tests, the test bioaerosols (E. coli) were aerosolized using a nebulizer and were deposited on the filter media for 5 minutes. After the deposited bioaerosols were exposed to unipolar air ions, they were incubated for 12 hours. The survival efficiency of E coli was measured using a colony counting method. The survival fractions of E coli exposed to positive air ions for 1, 5 and 10 minutes were 61.7%, 45.4% and 25.2%, respectively.
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