Evaluation of water matrix effects on light-based small disinfection systems
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Ketabchi, Faezeh
issued: 2023-05-02T17:13:12Z
issued: 2023
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: The global challenge of providing clean water supply for an increasing population is growing at an unprecedented pace. The most acute public health risk associated with drinking water is the potential presence of pathogens due to ineffective treatment. Therefore, there is an essential need for effective and efficient drinking water disinfection systems. Ultraviolet (UV) radiation and photocatalytic technologies are effective light-based disinfection methods that have grown in popularity, particularly in resource-limited scenarios. Due to increased cost, maintenance, and footprint, it is desirable to omit the filtration process in treatment systems utilizing UV for disinfection. However, understanding UV effectiveness for water treatment is primarily based on studies that have assumed pre-filtration and removal of particulates. To identify potential issues with applying UV to unfiltered water sources, this study investigated the effect of the water quality characteristics of unfiltered water samples on UV disinfection efficacy. UV biodosimetry tests were conducted over a year using water samples from two treatment plants that apply UV without filtration. The results showed that instead of typical water quality parameters such as turbidity and UV absorbance, the surface charge of particulate matter is the principal characteristic that describes UV dose-response relationships for unfiltered water sources. In terms of photocatalytic disinfection, this thesis focused on identifying possible interference of background natural organic matter (NOM) on photocatalytic disinfection via a novel metal-free visible-light active material, carbon nitride (CNx). In addition, any potential changes of the photocatalytic process on the character of background NOM was investigated using fluorescence spectroscopy. The results indicated that despite decreased inactivation efficiency of UV-LED disinfection system due to the particulate effect in unfiltered water samples, particles and NOM …
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/84543
note: Evaluation of Water Matrix Effects on Light-Based Small Disinfection Systems by Faezeh Ketabchi B.Sc., Amirkabir University of Technology, 2015 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in THE COLLEGE OF GRADUATE STUDIES Civil Engineering THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) April 2023 © Faezeh Ketabchi, 2023 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, a thesis entitled: Evaluation of Water Matrix Effects on Light-Based Small Disinfection Systems submitted by Faezeh Ketabchi in partial fulfillment of the requirements of the degree of Master of Applied Science. Dr. Nicolás Peleato, School of Engineering Supervisor Dr. Rehan Sadiq, School of Engineering Supervisory Committee Member Dr. Cigdem Eskicioglu, School of Engineering Supervisory Committee Member Dr. Kenneth Chau, School of Engineering University Examiner iii Abstract The global challenge of providing clean water supply for an increasing population is growing at an unprecedented pace. The most acute public health risk associated with drinking water is the potential presence of pathogens due to ineffective treatment. Therefore, there is an essential need for effective and efficient drinking water disinfection systems. Ultraviolet (UV) radiation and photocatalytic technologies are effective light-based disinfection methods that have grown in popularity, particularly in resource-limited scenarios. Due to increased cost, maintenance, and footprint, it is desirable to omit the filtration process in treatment systems utilizing UV for disinfection. However, understanding UV effectiveness for water treatment is primarily based on studies that have assumed pre-filtration and removal of particulates. To identify potential issues with applying UV to unfiltered water sources, this study investigated the effect of the water quality characteristics of unfiltered water sample…
has type: Thesis/Dissertation
date issued: 2023-05
is shown at: 10.14288/1.0431589
language: eng
degree discipline: Civil Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Peleato, Nicolas M.
type: Text
identifier URI: http://hdl.handle.net/2429/84543