THESIS
2014
xv, 99 pages : illustrations (some color) ; 30 cm
Abstract
Airborne diseases are recognised by the World Health Organisation (WHO) to be among
the top ten causes of death and have caused numerous pandemic outbreak in recent years.
After Severe Acute Respiratory Syndrome (SARS) in 2003 and H1N1 influenza pandemic in
2009, effective air sterilization methods gained public attention. Various air disinfection units
such as ionizers and ozone-generating purifiers emerge as successful commercial products.
However, these purifiers are energy-intensive and poses potential health concerns caused by
ozone generation. Although alternatives such as high quality air filters can effectively remove
bioaerosols from the air stream, trapped microbes continue to aggregate and populate on the
filter surface during the filtration process and eventually res...[
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Airborne diseases are recognised by the World Health Organisation (WHO) to be among
the top ten causes of death and have caused numerous pandemic outbreak in recent years.
After Severe Acute Respiratory Syndrome (SARS) in 2003 and H1N1 influenza pandemic in
2009, effective air sterilization methods gained public attention. Various air disinfection units
such as ionizers and ozone-generating purifiers emerge as successful commercial products.
However, these purifiers are energy-intensive and poses potential health concerns caused by
ozone generation. Although alternatives such as high quality air filters can effectively remove
bioaerosols from the air stream, trapped microbes continue to aggregate and populate on the
filter surface during the filtration process and eventually results in filter degradation and
penetration. Microbe populated filters can lead to subsequent volatile organic compounds
(VOCs) release and become the source of pathogenic recontamination.
This thesis reports on a multilevel antimicrobial filtration system that employ the use of
controlled-release antimicrobial coating applied on particulate air filters. Gaseous biocide, chlorine dioxide, was encapsulated and control-released for sustained “release-killing”.
“Contact-killing” and “anti-adhesion” were also engineered into the encapsulating shell by the
use of catalytic-dyad and detergent polymers. After the antimicrobial coating was
incorporated into two types of particulate air filters (i.e., HVAC and HEPA), the “release-killing”,
“contact-killing” and “anti-adhesion” properties of the new multilevel antimicrobial
particulate air filters were investigated. Accelerated life test indicates the antimicrobial
particulate air filter has an operation life of at least 12 months. Better than two log bacterial
reduction was also observed for ten minutes contact test.
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