The overall plant layout and process design incorporate future expandability and operational continuity. Phase 1 facilities are configured to allow connection to the Phase 2 expansion with minimal plant shutdowns or bypass requirements. Complete process redundancy is provided throughout the facility, allowing individual basins or major equipment to be taken out of service for maintenance while maintaining full treatment capacity.

Preliminary treatment includes mechanical screening and a grit removal system to protect downstream processes by removing large debris and abrasive materials. An anoxic zone located upstream of the aeration basins is provided to support biological nitrogen removal. Chemical phosphorus removal is achieved through aluminum sulfate injection into the aeration basin effluent channel.

Following secondary treatment and disinfection, effluent is further polished through three cloth media filters to ensure compliance with low CBOD₅, TSS, and nutrient limits. The filtered effluent then passes through a post‑aeration basin to maintain the required dissolved oxygen concentration, followed by a dechlorination basin prior to discharge to the receiving stream. This treatment train ensures consistent production of high‑quality effluent with no adverse downstream impacts.

Residuals handling is supported by a belt filter press sludge dewatering system designed to efficiently reduce sludge volume and minimize truck hauling requirements. The overall design reflects a robust, flexible, and regulatory‑compliant solution tailored to meet both current and long‑term wastewater treatment needs for the City of Elgin.