Removal of viable bioaerosol particles with a low-efficiency HVAC filter enhanced by continuous emission of unipolar air ions

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Title Removal of viable bioaerosol particles with a low-efficiency HVAC filter enhanced by continuous emission of unipolar air ions
Author Huang, Shih Hui; Agranovski, Igor E; Pyankov, Oleg; Grinshpun, S.
Journal Name INDOOR AIR
Year Published 2008
Place of publication OXON, ENGLAND
Publisher BLACKWELL PUBLISHING
Abstract Continuous emission of unipolar ions has been shown to improve the performance of respirators and stationary filters challenged with non-biological particles. In this study, we investigated the ion-induced enhancement effect while challenging a low-efficiency heating, ventilation and air-conditioning (HVAC) filter with viable bacterial cells, bacterial and fungal spores, and viruses. The aerosol concentration was measured in real time. Samples were also collected with a bioaerosol sampler for viable microbial analysis. The removal efficiency of the filter was determined, respectively, with and without an ion emitter. The ionization was found to significantly enhance the filter efficiency in removing viable biological particles from the airflow. For example, when challenged with viable bacteria, the filter efficiency increased as much as four- to fivefold. For viable fungal spores, the ion-induced enhancement improved the efficiency by a factor of similar to 2. When testing with virus-carrying liquid droplets, the original removal efficiency provided by the filter was rather low: 9.09 +/- 4.84%. While the ion emission increased collection about fourfold, the efficiency did not reach 75-100% observed with bacteria and fungi. These findings, together with our previously published results for non-biological particles, demonstrate the feasibility of a new approach for reducing aerosol particles in HVAC systems used for indoor air quality control
Peer Reviewed Yes
Published Yes
Publisher URI http://www.wiley.com/bw/journal.asp?ref=0905-6947
Alternative URI http://dx.doi.org/10.1111/j.1600-0668.2007.00512.x
Volume 18
Issue Number 2
Page from 106
Page to 112
ISSN 0905-6947
Date Accessioned 2009-03-14
Language en_AU
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Environmental Technologies
URI http://hdl.handle.net/10072/23540
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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