O2 Rotor

Although the low speed vertical shaft aerators are more often used for oxidation ditches / carrousel systems, the brush aerator is still alive. After 40 years, a design review was undertaken in 1998 by Spaans Babcock resulting in the O2Rotor.
In the past, brush aerators were introduced for use in oxidation ditches to bring oxygen and propulsion in to the water. While slowly rotating through the water and by splashing around, oxygen transfer will take place.
The O2Rotor is a robust, low speed aerator, with a high level of corrosion resistance due to the stainless steel blades and the coating system. By using quality steel for all the parts of the aerator instead of plastic the failures of broken and bent flights and tubes will be eliminated.


The O2Rotor consists of a tube/shaft with typically designed flights, to give maximum performance, clamped and bolted around the tube. Adjacent assemblies are staggered to ensure that adjacent blades do not contact the water surface at the same time. This staggering ensures the forces generated are reduced resulting in less vibration and increased bearing and gear life.
Together with a drive unit and some heavy load bearings the brush aerator can be easily installed in the oxidation ditch. Depending on the requirements of our clients, several possibilities of drive unit formats are possible.
The brush aerator can be installed standing on the side walls of the ditch or hanging under a bridge which also directly gives protection against splashing.
In some cases it will be necessary to improve the performance of the flow and oxygen transfer, for example because of the depth of the ditch. By the use of flow baffles we can overcome this.
The use of splash covers will give extra protection for the surrounding area, reduce noise and aerosols and protect the rotor from ice when the temperature drops below zero degrees Celcius.


  • High oxygen efficiency
  • Outstanding propulsion capacity
  • Smooth operation
  • Clog free design
  • Low maintenance
  • Universally adaptable
  • Weather resistant
  • High corrosion resistance
  • Long life expectancy


Accessories which can be added to the brush aerator

  • flow baffles
  • splash covers
  • drive unit covers
  • hanging construction (for installation under a bridge)
  • splash plates
  • safety railings
  • bridge construction