The City of Saint-Eustache plans to increase the capacity of its filtration plant from 32,000 m3/d to 55,840 m3/d in order to meet the increasing demand and conform with the most recent regulations on drinking water quality and filtration plant design.  Once the project completed, the plant will be able to meet the projected needs of the community until 2018. 

The extension to the plant must take the following points into account:

• reuse of existing space and functional equipment;
• improvement of the treatment stream;
• optimization of energy consumption;
• phazed implementation of the project by treatment blocks. 

Services provided

• Conceptual studies (1994)
• Preliminary studies (1999)
• Plans and specifications (2003)
• Support during tender process (2003)
• Analysis of tenders (2003)
• Supervision and commissioning (2004-2005) 

Unique aspects of the project

The work at the filtration plant consists of the following : 

• Modification of the water intake structure
• Modification of  screens at the raw water tank
• Transformation of the pre-ozonation tanks into coagulation and flocculation tanks
• Modification to the flow regulation chamber
• Transformation of 4 Pulsator to Ultrapulsator clarifier
• Addition of an inter-ozonation system including two ozone contact tanks
• Dismantling of an existing clarifier to transform it into two new filters
• Addition of UV reactors
• Renovation of disinfection system and all chemical systems in the plant
• Minor modifications to the drinking water  storage reserve.

The work also includes the design of a global instrumentation and control system for the entire plant and the other building services.

The automation components of the project must be of industrial quality so as to allow life expectancy of at least 20 years. The engineering activities will be carried out by a team specialised in automation. The engineering documents prepared by the team will require that the contractor use a systems integrator during construction.