Assessment of Iodine-treated Filter Media for Removal and Inactivation of MS2 Bacteriophase Aerosols
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FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
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The filters physical PRE and viable removal efficiencies VRE were investigated with challenges of MS2 bacteriophage aerosols, and the infectivity of MS2 collected on the filter was analyzed. To test a proposed inactivation mechanism, media containing thiosulfate or bovine serum albumin BSA were put in impingers to quench and consume I2 released from the filter. In direct plating experiments, treated filters presented significantly higher VREs than did untreated filters however, collection in excel BSA decreased VRE by half and in thiosulfate the apparent VRE decreased drastically. No significant difference in infectivity of retained viruses on treated and untreated filters was observed at the same environmental condition. Evidence presented herein for competition by dissolved I2. It also requires that dissociation of iodine from the filter and capture of iodine by MS2 aerosols as they pass through the filter be factored in the design of the assessment methodology. The filters strong retention capability minimizes reaerosolization but also makes it difficult to discriminate the antimicrobial effect at the surface.
- Physical Chemistry