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Germany, Austria, Switzerland


Lohn-Rießel, Germany

Passavant Surface Aerator Mammutrotor®

The wastewater treatment plant in Lohne-Rießel needs to replace an existing Mammutrotor® from the year 1975. The new rotor has to be delivered with a guide baffle and an aerosol protection device. The aeration tank can‘t be emptied during the operation and the water level merely can be lowered by 20 to 40 cm therefore the equipment has to be installed in the complete filled basin.


The Aqseptence Group offered and delivered a Passavant Surface Aerator Mammutrotor® 1000 mm – 9.0. The device was installed and put into operation in June 2014.


Since start-up, the Mammutrotors® have been running completely satisfied without significant problems.
The technical support provided by the Aqseptence Group complies with the agreements therefore the Oldenburg-Ostfriesische wastewater association certifies the Aqseptence Group the required expertise, efficiency and reliability based to the aforementioned treatment plant.

Key Features

Oldenburgisch-Ostfriesischer Wasserverband
Georgstraße 4
26919 Brake

Delivery date:
June 2014


  • Particularly robust operational mode and long service life.
  • Constant oxygenation over entire operation time.
  • Low maintenance.
  • Flexible use regarding to automatic control technique and cleaning objectives.
  • No negative influence based on oxygenation by any sewage ingredients.

Technical Data

1 x Passavant® Surface Aerator Mammutrotor® 1000 - 9,0
Installed under concrete bridge (Installation by customer)

Nominal length of the rotor:      9.0 m
Diameter:                                        1000 mm
Propulsion:                                     45 kW
Rot. frequency:                              72 min-1
Oxygenation:                                 ~81 kgO2/(h*rotor) (max. with guide baffle)
Oxygenation:                                 ~67.5 kgO2/(h*rotor) (max. without guide baffle)
Oxygen transfer efficiency:        ~2 kgO2/kWh (max. with guide baffle)

Are you interested in more details or do you have any further requests?

Therefore, please get in touch via our general contact form and refer to this specific case study.