Exposure risk of an airborne pathogen in washroom

Pao Yue-kong Library Electronic Theses Database

Exposure risk of an airborne pathogen in washroom

 

Author: Li, Nan
Title: Exposure risk of an airborne pathogen in washroom
Degree: M.Eng.
Year: 2013
Subject: Airborne infection.
Toilets.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: ix, 83 leaves : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2641105
URI: http://theses.lib.polyu.edu.hk/handle/200/7105
Abstract: Human is exposed to external environments whenever and wherever via the visible exterior (e.g. skin and openings into the body), and the washroom may have the highest exposure risk for its appropriate temperature and humidity for pathogens to survive. A number of studies discovered the airborne route of diseases transmission from human to human, however, limited discussions concern on feces or vomit relevant pathogens, though which have be proved that many viruses are shed in. When flushing the toilet, the pathogens escape to the indoor air, and can be inhaled by the user, human may be infected with the diseases. This study aims to identify the exposure risk of Escherichia coli (E. coli) in washroom, and discover the relationship between the ventilation rate and position of exhaust fan and the exposure risk. Both the measurements and computational fluid dynamics (CFD) modeling were adopted in the study, including the measurement of air change rate (ach) and DANTEC airflow velocity in the washroom, and the simulations of three ventilation rates and three positions of exhaust fan. The exposure risk is estimated by the Wells-Riley model. The comparisons indicates that both the increasing ventilation rate and the exhaust fan beside the toilet can reduce the exposure risk, while the fan beside the toilet has far more apparent effect than changing the velocity, whose risk is almost zero. The study suggests the design of exhaust fan in washroom is better approaching the pollution source to avoid the diffusion of the contaminants rather than increasing the air change rate. Once the pathogens spread again, the exposure risk would sharply increase.

Files in this item

Files Size Format
b26411052.pdf 3.019Mb PDF
Copyright Undertaking
As a bona fide Library user, I declare that:
  1. I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
  2. I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
  3. I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.

     

Quick Search

Browse

More Information