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dc.contributor.authorSaulnier, Rain
dc.contributor.otherQueen's University (Kingston, Ont.). Theses (Queen's University (Kingston, Ont.))en
dc.description.abstractPotable water in Canada leaves treatment facilities in pristine quality and excellent condition for both drinking and sanitation. However, customer concerns related to discoloured drinking water continue to serve as a worldwide issue in urban drinking water distribution systems (DWDS). Fundamentally, water discolouration is a result of the long-term accumulation of particulate material which is subsequently mobilized due to sudden changes in hydraulic conditions. Field and laboratory studies have shown that cohesive layers on the pipe wall are adaptive to the respective environmental and hydrodynamic conditions. The most readily used approach to manage the risk of water discolouration is unidirectional flushing of watermains. The imposition of an increased hydraulic shear stress erodes these cohesive layers from the pipe wall into the bulk water. To examine the regeneration and mobilization of discolouration material a full-scale laboratory was designed to simulate the operation of a DWDS. The laboratory consists of two identical pipe loops comprised of 108 mm diameter PVC pipes, each with a length of 198 m. All components of the laboratory are located within a climate-controlled chamber to simulate seasonal temperature variation. The laboratory is fitted with instrumentation to monitor turbidity, flow rate, pressure, and temperature in a real time manner. Three experiments of duration 40, 80 and 120 days allowed for the growth of cohesive layers under steady-state flow conditions. Each growth phase was followed by 3 successive 15-minute flushing intervals to erode the layers. Grab samples for TSS, metals composition and particle size distribution were scheduled throughout each experiment. Results found that cohesive layers of various strength characteristics developed with an approximate linear increase in turbidity response with increased growth duration. The strength of cohesive layers was observed to increase with increased growth duration. The conditioning velocity during each growth phase had a negligible effect on both material accumulation and layer strength. Turbidity was determined to be a good indicator of total suspended solids and iron in the water.en_US
dc.relation.ispartofseriesCanadian thesesen
dc.rightsCC0 1.0 Universal*
dc.rightsQueen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canadaen
dc.rightsProQuest PhD and Master's Theses International Dissemination Agreementen
dc.rightsIntellectual Property Guidelines at Queen's Universityen
dc.rightsCopying and Preserving Your Thesisen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.titleExamining the Influence of Near Wall Hydraulics on the Regeneration and Mobilization of Discolouration Material in a Drinking Water Distribution Laboratoryen_US
dc.description.degreeMaster of Applied Scienceen_US
dc.contributor.supervisorSaulnier, Rain
dc.contributor.departmentCivil Engineeringen_US

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