American Society of Civil Engineers


Influence of Flow Development Time on the Residence Time Distribution and Flow Pattern in a Scale Model of a Water Treatment Plant Clearwell


by Xiaoli Yu, (Graduate student, Dept. of Civil & Geological Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, Saskatchewan, Canada S7N 1A9 E-mail: xiy862@mail.usask.ca), K. A. Mazurek, M.ASCE, (Assist. Professor, Dept. of Civil & Geol. Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, Saskatchewan, Canada S7N 1A9 E-mail: Kerry.Mazurek@usask.ca), G. Putz, (Associate Professor, Dept. of Civil & Geol. Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, Saskatchewan, Canada S7N 1A9 E-mail: Gordon.Putz@usask.ca), and C. Albers, (Senior Water Resources Engineer, AMEC, 221-18th Street SE, Calgary, Alberta T7K 1A9 E-mail: cory.albers@amec.com)
Section: Wastewater System Analysis: Innovative Approaches, pp. 1-10, (doi:  http://dx.doi.org/10.1061/40976(316)669)

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Document type: Conference Proceeding Paper
Part of: World Environmental and Water Resources Congress 2008: Ahupua’A
Abstract: This paper presents results of scale model testing of. the Glenmore Water Treatment Plant NE Clearwell in Calgary, Alberta, Canada. This clearwell has a perforated baffle wall at its inlet, a 4-pass serpentine system, and a weir at the outlet. The model was operated based on Froude similarity and had a scale of 1:19. Tracer studies and flow visualization were carried out for three flow rates. From the residence time distribution developed from the tracer tests, it was seen the baffle factor and Morril Dispersion index were affected by the time between when the flow in the model and tracer test was initiated. It took approximately 10 h of flow development time for the results to reach steady-state values for the minimum flow rate. At higher flows, the baffle factor was not as strongly affected by flow development time, however the Morril Dispersion index better matched prototype values at longer times.


ASCE Subject Headings:
Canada
Flow patterns
Scale ratio
Wastewater management
Water treatment plants