Anglian Water cuts aerator energy use in half with variable speed drive

The drive was installed on a 4 kW sewage aerator at the Swallow unmanned treatment works in Lincolnshire. Wayne Barley, Northern Energy and Efficiency Engineer for Anglian Water, says: “The vertical rotor of the aerator was set on a duty cycle of 20 minutes off, 20 minutes on. Working in this way, there were frequent sudden stops and starts that caused shock loads on the motor and gearbox, as well as needing frequent operation of…