A waterwheel variable frequency aerator is a type of aeration equipment used in water treatment and sewage treatment facilities. It typically consists of a waterwheel, a motor, and a frequency converter.

The waterwheel is used to create an air-water mixture, which is then distributed through the treatment system. The motor and frequency converter are used to control the speed of the waterwheel and the rate of aeration, allowing for precise control of the oxygenation levels in the water.

This type of aeration system is often used in applications such as wastewater treatment, fish farming, and aquaculture, as it allows for efficient oxygenation and can help to improve water quality and promote the growth of beneficial microorganisms.