By Rob Stephenson and Bruce Tennant, McKay Creek Tech.; and Don Hartle and George Geatros Vancouver Shipyards Co. Ltd. Vancouver Shipyards is part of the Washington Marine Group, the largest shipbuilding, ship maintenance and repair, and marine transportation company in Canada. Inherent to this scale of operation, the Washington Marine Group generates large quantities of emulsified oily wastewater. Managing the oily bilge water, ballast water, fuel/slop tanks, tank wash water from gas freeing operations, and wastewater from pressure washing machinery was becoming a big and expensive problem at Vancouver Shipyards. Both salt and fresh wastewaters are contaminated with emulsified oil and grease…