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Corbett Creek Water Pollution Control Plant Upgrades

Services, Wastewater Services

Corbett Creek Water Pollution Control Plant Upgrades

Client: Regional Municipality of Durham
Location: Whitby, Ontario

Project Status: The detailed design and tendering was completed in June 2009. Project construction commenced in July 2009 and the project was substantially performed in January 2011 at a construction cost of $7.7 million.

Project Description:

R.V. Anderson Associates Limited (RVA) was retained to provide engineering services to design plant upgrades at the Corbett Creek Water Pollution Control Plant (WPCP). The plant-wide upgrades will increase the rated capacity of the plant from 72,700 m3/d to 84,350 m3/d, and meet CEPA Act (1999) Pollution Prevention (P2) Plan requirements for non-toxic effluent (<0.02 mg/ L of Total Residual Chlorine).

The requirement to re-rate the plant and nitrify the effluent called for a significant upgrade to the existing aeration system. The aeration capacity in part of the plant was increased immediately by more than 70%, while the aeration capacity for the remainder of the plant will be increased in stages as required. The new aeration system was designed with larger blowers, new piping and controls, all to be accommodated in the existing structures, maximizing the use of existing infrastructure.

In addition, the re-rating of the plant involved engineering design to increase the capacity of the raw sewage pumping station, modification of the primary clarifiers, the Return Activated Sludge (RAS) and Waste Activated Sludge (WAS) distribution system, the secondary clarifiers and one of the existing chlorine contact tanks. A new disinfection facility was built to provide chlorination of part of the plant effluent, including potential bypass flows and dechlorination to the entire plant effluent, including the chemical storage and distribution system equipment, piping and controls, a new effluent water distribution system, and other modifications to improve process flexibility.

Control system upgrades included replacement of all Ethernet communication lines with fibre optic lines and modifications of all PLC cabinets throughout the plant.


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