In order to comply with Environment Canada’s requirements for a reduction in total residual chlorine in final effluent to a level below 0.02 mg/L as per Environmental Protection Act 1999, the City of Orillia has implemented UV disinfection of the wastewater effluent at the Orillia Wastewater Treatment Centre (WWTC). R.V. Anderson Associates Limited (RVA) was retained by the City to design the UV disinfection system and to provide engineering services during construction.
The system, which uses low-pressure/high-intensity UV lamps, was designed to achieve E. coli levels at <100/100 mL in the final effluent, at a peak flow rate of 72,700 m3/d. Intensive pre-application consultations were carried out with the MOE, which resulted in temporary permission to discharge final effluent without disinfection during the construction period, eliminating costs and schedule delays associated with building temporary treatment facilities.
The UV disinfection system was installed in the first channels of the former multi-pass chlorine contact chamber, with a masonry building built on top of a new concrete slab, and covering the existing facility. By reusing the existing channels a number of benefits have been realized, specifically with regards to the reduction in space requirements for the new UV disinfection system. This resulted in a reduced capital cost and a reduced construction schedule.
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