Abstract

The City of Edmonton’s Gold Bar Wastewater Treatment Plant (GBWWTP) is at the downstream end of a collection system servicing approximately 634,000 people plus industrial and commercial areas. The plant has a relatively flat hydraulic profile, such that the effluent weir on the primary tanks is 0.23 m above the invert of the incoming conduit. The effluent weir on the secondary clarifiers is only 0.38 m below the primary tank weir.

To understand and evaluate the hydraulic relationship between the upstream collection systems and the GBWWTP a detailed hydraulic model of GBWWTP was developed and included as part of the collection system hydraulic model. The hydraulic model was constructed using the Danish Hydraulic Institute MOUSE model using approximately 150 elements to describe the various treatment and conveyance processes. This included grit tanks, screens, primary settling basins, bypasses, secondary aeration basins, secondary clarifiers, ultra violet disinfection, and outfall to the river. The combined collection and treatment plant model was used to simulate alternative flows scenarios to and through the treatment plant as part of a City wide CSO Strategy. Alternatives evaluated include increased pipe capacity in the downstream portions of the conveyance system, increased conduit capacity into the GBWWTP, and pressurized flow in the conveyance system.

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