Germicidal Effects of Antibacterial Filter on Bioaerosols
Date Issued
2012
Date
2012
Author(s)
Lien, Yen-Chun
Abstract
Suspended particles in indoor air such as bioaerosols, we often use electrostatic filter to control them. At this experiment,we would use different antimicrobial electrostatic filters to control bioaerosols. The experimental manipulation of variables contain type of Bioaerosol(E. coli、C. famata and λ vir)、type of filter (non-woven filter、filter of coating with AgNps、filter of coating with binder)、loading time(5、10、15、20、25、30minutes)、relative humidity (30% and 70%) and survival rate experiment(5、10、15、20、25、30minutes). The filtration result show the efficiency of AgNps filter at relative humidity 30% were 39.9% ( E. coli )、34.7% (C. famata)、13.8% (λ vir),and the efficiency of AgNps filter at relative humidity 70% were 39.7% ( E. coli )、23.8% (C. famata)、13.8% (λ vir).At another filtration result show the efficiency of binder filter at relative humidity 30% were 37.5% (E. coli )、32.2% (C. famata)、13.5% (λ vir), and the filtration result with the same filter at relative humidity 70% were 38.1% (E. coli )、40.6% (C. famata)、7.4% (λ vir).We had a conclusion when relative humidity enhancing would let filtration slightly decrease, because the surface charge of filter changed. At the loadind experiment, filter was used “washing” to collect bioaerosol from the filter. By this step, three kinds of bioaerosol data of filter loading trend and recovery rate would be known. Thereforce we got a conclusion, bioaerosol could not survival on the coating filter, that showed AgNps as an very good antibacterial chemical whether relative humidity changed or not(antibacterial efficiency was 87.6% to 100%). Because of the filtration efficiency was low, the overall efficiency had only 10% to 40%.On the use of antibacterial chemical, AgNps are less harmful to human body than nanosilver, so AgNps is an alternative to antimicrobial chemical of nanosilver as air cleaners.
Subjects
bioaerosol
silver nanoparticles immobilized on nano silicate
filtration
filter
antibacterial
loading
Type
thesis
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