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Noggerath® Drum Screen

Ujams, Namibia


The wastewater treatment plant in Ujams treats industrial wastewater with a low municipal content. A membrane bioreactor (MBR) is used as the biological treatment stage. Since this process is very sensitive to contaminants, a functioning protective barrier must be installed upstream.
Fine screening with a drum microscreen (Passavant® CarbonExtract®) is suitable for this purpose.


By controlling the surface aerators according to demand, the process stability in the wastewater treatment plant has improved significantly. This results in improved and less fluctuating effluent values for nitrogen compounds. In addition, an average saving of 5% in the overall electricity consumption of the treatment plant was achieved, even though additional agitators and pumps were put into operation. By integrating P precipitation into the control system, the P effluent value could be kept stable. However, the amount of precipitant used has been reduced by > 40%.

Technical Data

Noggerath® Drum Screen
RSH-MG 1600 x 3000

Drum diameter: 1600 mm                                                                                                                                                                                                                                                                            Drum length: 3000 mm


  • Compact mechanical pre-cleaning
  • Reliable removal of particles, suspended and fibrous matter
  • Optimal protection of sensitive membrane vitalisation

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