How is power and oxygen input controlled?

There are two methods of controlling power and therefore oxygen input—impeller submergence and impeller speed.

Submergence: The water level can be lowered relative to the impeller by an effluent weir to reduce the “bite” on the impeller blades. The difference between the high water level (submergence) and low water level (submergence) is generally less than one foot (30 cm). In the past, this was the only method for controlling aerator HP output and oxygen delivery. Today, adjusting impeller submergence is performed with an electrically actuated weir to improve aerator transfer efficiency using our energy optimizer package, which is available with the Oculus control system.