Author: Zhan, Ni
Title: Tracer gas experiments on bioaerosol transmissions in the drainage system of a 3-floor mock-up toilet
Advisors: Mui, Kwok Wai Horace (BEEE)
Degree: M.Eng.
Year: 2023
Subject: Drainage -- Simulation methods
Plumbing -- Waste-pipes -- Simulation methods
Air flow -- Simulation methods
Hong Kong Polytechnic University -- Dissertations
Department: Department of Building Environment and Energy Engineering
Pages: vi, 66 pages : color illustrations
Language: English
Abstract: COVID-19's rising has been uncontrolled around the world, with a very wide and quick spread, and the spread of COVID-19 has had a great impact on people's daily, affecting their lives, travel, and work. Recently, there have been actual cases where bioaerosols carrying the virus in human feces may be transmitted vertically through drainage systems into neighbors' homes, leading to the occurrence of infection.
A full-scale, 3-floor mock-up toilet was used in this project. By changing the opening and closing of windows, doors, exhaust fans, and toilet flushing in this mock-up toilet, the factor that most influences the spread of virus-carrying bioaerosols was investigated. A total of 26 experimental scenarios were considered in the experiment. A tracer gas was utilized to simulate the discharge of virus-carrying bioaerosols from the G/F toilet drainage pipes, and possible pathways in their drainage pipe transmission were searched using concentration variations measured by eight separate samplers.
The results showed that virus-carrying bioaerosols do spread vertically through the drains of toilets, causing infectious effects on people's lives. Through experiments on different scenarios, this dissertation proposes recommendations to reduce the risk of transmission in different scenarios.
Rights: All rights reserved
Access: restricted access

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