Clarified liquid from the secondary clarifiers flows through the Ultraviolet (UV) light disinfection unit. Radiation produced by the UV lamps penetrates the cell wall of microorganism and is absorbed by cellular materials, which either prevents replication or causes death of the cell. As a result, pathogenic microorganisms are almost entirely inactivated or killed. The effluent is then discharged to the North Saskatchewan River through an outfall structure.
The UV light disinfection technology is considered to have no adverse environmental impacts.