Mississippi Mills WWTP

Aerial Overview of Mississippi Mills wastewater treatment plant
Tower Crane
Tower crane and pump truck pouring slab
rebar installation for foundation slab featuring large process pipe penetrations
Winter foundation wall pours featuring rebar, formwork, heating and hoarding
Stack of process pipes
NAC employees preparing wall formwork surrounding large pipe penetration
Aerial Overview of Mississippi Mills wastewater treatment plant
Project Type: 
Water Treatment
Project Owner: 
Town of Mississippi Mills
Project Consultant: 
Ontario Clean Water Agency
Project Years: 
2010-2012

This project involved the construction of a new wastewater treatment plant, adjacent to the site of the existing sewage lagoons to serve the town of Almonte, Ontario.

The construction of the plant ran over approximately 22 months and involved all disciplines including rock and earth excavation, yard piping, reinforced concrete, various architectural trades, equipment installations, process piping, building HVAC as well as electrical distribution, instrumentation and SCADA. Included in this was the construction of a 1.4 km long sewage forcemain from the existing pump station.

The plant intakes raw sewage and discharges filtered, disinfected effluent at the existing discharge point. The process includes screening and grit removal, aeration, clarification, filtration, UV disinfection, sludge thickening, digestion and dewatering as well as cake handling and storage. As part of the upgrade the existing sewage pump station was retrofitted with new coarse bar screens and raw sewage transfer pumps as well as electrical distribution equipment.