IMF Immersed Membrane Filtration

Cost effective wastewater treatment strategies for advanced phosphorous and trace organics removal

Project start :01.12.2000Duration :39 months

2 CMF-BR Memcor membrane pilot plants
2 biological reactors with supervision and control system


Since the Berliner Wasserbetriebe must recharge groundwater by artificial surface water infiltration, wastewater treatment must be of high standard to prevent eutrophication and algal bloom in the receiving surface water.
In Berlin phosphorous is generally the limiting nutrient in receiving water courses, and future stringent phosphorous regulations are expected (down to 50 µg/L in some cases). The occurrence of short water cycle in the Berlin area raises also concern related to the presence of trace organics in wastewater effluents. Membrane bioreactor (MBR) technology could be an option to tackle these issues in decentralised areas.


Process for decentralised unit


- Parallel assessment of 3 phosphorous removal processes or any combination.

- Cost effective phosphorous removal strategies for different discharge objectives.

- Design criteria for MBR demonstration plant in decentralised area.


Water reuse


- Removal of residual COD and health related organic compounds through MBR.

- Performance comparison with conventional treatment.

- Optimisation of MBR process to remove micro-pollutants.



Two identical and flexible MBR pilot plants (1-3 m³ each), are operated in parallel to Ruhleben STP (Berlin).


Boris LESJEAN (Veolia Water)
Regina GNIRSS (Berliner Wasserbetriebe)