Intermittent operations of passive membrane systems
department or school: Applied Science, Faculty of
department or school: Civil Engineering, Department of
data provider: DSpace
degree campus: UBCV
creator: Baskar, Varshini
issued: 2022-02-23T23:10:37Z
issued: 2022
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: Passive membrane systems are ideal for use in small and remote communities; they are operated under a low permeate flux, thereby requiring limited energy, they have few passive fouling control measures, leading to limited mechanical complexity, and are relatively easy to operate. Their operation depends on the formation of a structurally loose and permeable biofilm on the membrane surface, which helps stabilize the permeate flux and aids the removal of organic material and other material of concern. However, their application is potentially hindered by intermittent loading conditions caused by periods of no inflow demand, a characteristic of small and remote systems. Periods of no inflow could stress biofilm in passive membrane systems and affect the overall system stability and performance. The current study investigated the impacts of the periods of no inflow on the throughput and in organic material removal the passive membrane systems. Passive membrane systems operated with various periods of no inflow were considered and compared to a passive membrane system operated with continuous inflow. The periods of no inflow considered were 3 hours per 24 hours, 8 hours per 24 hours and 2 days per week. For the passive membrane systems operated with periods of no inflow, both conditions with no permeate recycling (i.e., no flow through system) and permeate recycling (i.e., flow maintained through system by recycling permeate) were considered. Results indicate that the periods of no inflow do not negatively impact the performance of passive membrane systems. Rather, periods of no inflow could lead to better performance. The results also provided insight on the relationship between the length of the periods of no inflow, the recycling of the permeate during periods of no inflow, and the overall performance of passive membrane systems. In small and remote communities, the financial investment in equipment and operations for permeate recycling during periods of no inflow mig…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/80875
note: INTERMITTENT OPERATIONS OF PASSIVE MEMBRANE SYSTEMS by VARSHINI BASKAR A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Civil Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) February 2022 © Varshini Baskar, 2022 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, the thesis entitled: Intermittent operations of passive membrane systems submitted by Varshini Baskar in partial fulfilment of the requirements for the degree of Master of Applied Science in Civil Engineering Examining Committee: Dr. Pierre Bérubé, Professor, Department of Civil Engineering, UBC Supervisor Dr. Jongho Lee, Assistant Professor, Department of Civil Engineering, UBC Supervisory Committee Member iii Abstract Passive membrane systems are ideal for use in small and remote communities; they are operated under a low permeate flux, thereby requiring limited energy, they have few passive fouling control measures, leading to limited mechanical complexity, and are relatively easy to operate. Their operation depends on the formation of a structurally loose and permeable biofilm on the membrane surface, which helps stabilize the permeate flux and aids the removal of organic material and other material of concern. However, their application is potentially hindered by intermittent loading conditions caused by periods of no inflow demand, a characteristic of small and remote systems. Periods of no inflow could stress biofilm in passive membrane systems and affect the overall system stability and performance. The current study investigated the impacts of the periods of no inflow on the throughput and in organic material removal the passive membrane systems. Passive membrane systems operated with various periods of no inflow were considered and compared to a passive membrane system operated with continuo…
has type: Thesis/Dissertation
date issued: 2022-05
is shown at: 10.14288/1.0406646
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: Bérubé, Pierre R.
type: Text
identifier URI: http://hdl.handle.net/2429/80875