Germicidal Effects of Nano Silver Filter on Bioaerosols
Date Issued
2006
Date
2006
Author(s)
Tseng, Kuo-Wei
DOI
zh-TW
Abstract
The study evaluates filtration efficiency and germicidal effects of nano silver filter on bioaerosols. The experiment used a Collison nebulizer was used to generate Escherichia coli (E. coli), Bacillus. Subtilis (B. subtilis), endospores, yeast cells of Candida famata (C. famata) var. flareri, and spores of Penicillum citrinum (P. citrinum) and in the experimental system. After loading process, the bioaerosols were washed out of the test filter and then cultivated for counting. The experimental factors are microorganism species, relative humidity (30, 50, 70%), loading time (5－90 min), decay time (0－180 min) and type of filter (nonwoven filter and Ag-coated filter).
The experimental data revealed that filtration efficiency with nano silver filter of bioaerosols of E. coli, B. subtilis, C. famata, and P. citrinum at relative humidity of 50% were around 38.6, 29.9, 41.8, and 49.8% respectively. The germicidal effect of nano silver is E. coli > C. famata > B. subtilis > P. citrinum. The germicidal effect of E. coli is excellent (99%) when relative humidity is below 50 percent. Moreover, the nano silver filter has the better removal and germicidal efficiency in the high relative humidity (70%) for non-spore bioaerosols (E. coli and C. famata) than spore bioa erosols. The decay test showed that the survival rate decreased significant when E. coli and C. famata bioaerosols were intercepted on nano silver filter. In other words, we don’t need to worry that bioaerosols’ survival on nano silver filter.
Subjects
生物氣膠
奈米銀濾材
過濾
殺菌
bioaerosol
nano silver filter
filtration
germicidal
Type
thesis
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