Quantification of viable bioaerosol emanation from an ACMV system and its impact on indoor bioaerosol pollution

Xiong, J. W., Wan, M. P., Ng, B. F. and You, S. (2020) Quantification of viable bioaerosol emanation from an ACMV system and its impact on indoor bioaerosol pollution. Aerosol and Air Quality Research, 20(4), pp. 762-775. (doi: 10.4209/aaqr.2019.05.0253)

Abstract

Viable bioaerosol can deposit and multiply in air-conditioning and mechanical ventilation (ACMV) systems, eventually entering indoor environments after these systems are operated and contributing to indoor pollution. We propose a method for identifying and quantifying the emanation of viable bioaerosol from an ACMV system and its impact on indoor pollution through surface and air sampling followed by analysis using a material-balance model. Adopting this method, we investigated the contribution of viable bioaerosol from an ACMV system to the indoor pollution in an air-conditioned room located in Singapore. The system, which emanated viable bacteria and viable fungi at the rates of 2.4 CFU s–1 and 3.9 CFU s–1, respectively, was the largest source of indoor viable bacteria and the second largest source of indoor viable fungi (exceeded only by the outdoor fungi introduced through mechanical ventilation) in the air. Potentially pathogenic bioaerosol species in the genera of Staphylococcus, Moraxella and Aspergillus were also identified in the ACMV system. In particular, Moraxella osloensis, the most likely genus to originate from occupants, was found to accumulate in the ACMV system, indicating the potential effect of this system’s cleanliness on indoor pollution. Our method can be used as a tool for analysing the potential sources of indoor bioaerosol and supporting the development of effective control measures for bioaerosol emanation from ACMV systems.

• Item Type: Articles
• Additional Information: This work was funded by Republic of Singapore’s Ministry of Education through grant no. RG190/14 and MOE2016-T2-1-063 as well as Republic of Singapore's National Research Foundation through a grant to the Berkeley Education Alliance for Research in Singapore (BEARS) for the Singapore-Berkeley Building Efficiency and Sustainability in the Tropics (SinBerBEST) Program.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: You, Dr Siming
• Authors: Xiong, J. W., Wan, M. P., Ng, B. F., and You, S.
• College/School: College of Science and Engineering > School of Engineering > Systems Power and Energy
• Journal Name: Aerosol and Air Quality Research
• Publisher: Chinese Association for Aerosol Research in Taiwan
• ISSN: 1680-8584
• ISSN (Online): 2071-1409
• Published Online: 01 March 2020
• Copyright Holders: Copyright © 2020 Taiwan Association for Aerosol Research
• First Published: First published in Aerosol and Air Quality Research 20(4):762-775
• Publisher Policy: Reproduced with the permission of the publisher