To accommodate growth in Picton, ON, replacement of the Picton Wastewater Treatment Plant (WWTP) was required to provide additional treatment capacity. The existing plant was approaching its rated capacity and the site could not accommodate an expansion or upgrade. The new plant, commissioned and online in 2011, provides one of the highest levels of treatment in Ontario.
The County of Prince Edward awarded this project to the design-build team consisting of Dillon and Maple Reinders Constructors Limited. Dillon completed the preliminary design, detailed design, permits and approvals and construction administration for the new raw wastewater pumping station and the new Picton WWTP. The following unit processes were included:
- Rated capacity of 6000 m3/day and peak flow hourly flow of 26 400 m3/d
- Inlet works, septage receiving system and an ozonation system for odour control that operates as part of the heat recovery air make-up unit process
- Extended aeration tanks including an anoxic selector zone and step-feed capability
- Secondary clarification
- Chemical dosing for phosphorus removal
- Tertiary filtration system with EcoWash control
- Ultraviolet disinfection system
- New outfall
- Aerobic sludge digestion system and biosolids storage
- Energy efficient design allowance for future heat recovery from treated effluent and mini-turbine for electricity generation on outfall sewer.
Dillon assisted the County in securing funding for this project through the Federation of Canadian Municipalities Green Municipal Fund.