Wastewater Treatment
Wastewater annual reports
The Wastewater Treatment Centre Annual Performance Report and the Wastewater Collection System Annual Performance Report outline annual performance reports for the City's Wastewater Treatment Centre and Wastewater Collection System, meeting regulatory reporting requirements.
Septage receiving station
The septage receiving station at 125 James St W, Orillia, ON L3V 6Y3 operates 24 hours a day, 7 days a week. An approved septage receival application will provide an access code, PIN, and key to use the service.
Wastewater treatment process
The Wastewater Treatment Center serves the collection system through 19 pump stations that discharge to the main pump station. All influent is screened and passed through grinders prior to entering the treatment process.
Preliminary treatment includes coarse screening and aerated grit removal. Primary treatment is provided by three clarifiers, with primary sludge pumped directly to anaerobic digestion.
Secondary treatment consists of a six-cell activated sludge system operating as a plug-flow reactor, followed by five secondary clarifiers. Return activated sludge is recycled to the aeration basins, and waste activated sludge is thickened via dissolved air flotation prior to digestion.
Tertiary treatment is achieved using two cloth disk filters designed to remove phosphorus and suspended solids. Final disinfection is provided by a two-bank ultraviolet system prior to discharge through the outfall.
Solids are stabilized through two-stage anaerobic digestion. Biogas generated during digestion is used for heating, with excess gas flared. Digested sludge is stored in lagoons and land-applied to agricultural fields twice annually, typically in the spring and fall.
Contact Us
City of Orillia
50 Andrew Street South
Orillia, Ontario, L3V 7T5
Phone: 705-325-1311
Email us
Sign up for Orillia News
Stay up to date on City of Orillia activities, events, programs and operations by subscribing to our news.