Case Study: Refinement of Hydraulic Operation of a Complex CSO Storage/Treatment Facility by Numerical and Physical Modeling
Publication: Journal of Hydraulic Engineering
Volume 132, Issue 2
Abstract
The performance of a combined sewer overflow (CSO) storage/treatment facility in North Toronto, Ont., Canada, was investigated by conjunctive numerical and physical (hydraulic) modeling. The main objectives of the study were to (1) assess the feasibility of increasing the hydraulic loading of the CSO facility without bypassing; and (2) establish a verified numerical model of the facility for future work. The numerical model [a commercial computational fluid dynamics (CFD), PHOENICS] was validated and verified using results from a hydraulic scale model (1:11.6). The results obtained show that the CFD model can simulate hydraulic conditions in the facility well, as demonstrated by accurate reproduction of the filling rate, water levels at various locations, flow velocities in feed pipes, and overflows from the inflow channel. Numerical simulations identified excessive local head losses and helped select structural changes to reduce such losses. The analysis of the facility showed that with respect to hydraulic operation, the facility is a complex, highly nonlinear hydraulic system. Within the existing constraints, a few structural changes examined by numerical simulation could increase the maximum treatment flow rate in the CSO storage/treatment facility by up to 31%.
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Acknowledgments
The contributions made by Government of Canada’s Great Lakes 2020 Sustainability Fund, the City of Toronto staff Patrick Chessie and Sandra Ormonde, and NWRI Research Support Branch staff Bill Warrender, John Cooper, and Brian Taylor, are greatly appreciated.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 132 • Issue 2 • February 2006
Pages: 131 - 139
Copyright
© 2006 ASCE.
History
Received: Mar 9, 2004
Accepted: Mar 10, 2005
Published online: Feb 1, 2006
Published in print: Feb 2006
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