The Lorne Park Water Treatment Plant in the Regional Municipality of Peel, Ontario was originally built in 1975. In order to service the projected population up to year 2031, the Region of Peel retained AECOM and Genivar to expand the plant’s capacity to 500 megaliters per day (ML/d), which will make this project the largest membrane filtration system in the world.

The Lorne Park WTP’s current capacity of 347 ML/d is divided into two treatment plants: “old” rated at 227 ML/d, consisting of eight conventional treatment trains and “new” rated at 120 ML/d, consisting of four conventional treatment trains. To attain the desired capacity of 500 ML/d and meet the region’s criteria, the “old” plant will be retrofitted with a membrane filtration system, providing 380 ML/d through 16 membrane filtration trains. This allows the region to provide an operational margin of safety above Ontario’s Drinking Water Quality Standard, address emerging issues, and achieve treatment optimization in actual operations.

The plant will be equipped with an ultraviolet light disinfection system to ensure inactivation of pathogens and advanced oxidation to help control taste and odour. Lorne Park WTP is built largely beneath a community park on the shore of Lake Ontario. Due to its unique location, special efforts must be taken to minimize impacts. As such, the design incorporates existing operations and is confined to a small footprint in order to maximize current infrastructure. This project is scheduled for completion in 2012.