Oxidation ditcb systems for waste water treatment at various demands for effluent quality with regard to BOD, nitrogen and phosphorus are presented.

Simple design for only BOD-removal and nitrification as well as designs for advanced treatment including biological nitrogen and biological phosphorus removal are presented, and full scale results from more than 15 years of operation are shown.

The simple design and price competitive construction can none the less produce effluent qualities below 15 mg BOD/l, 8 mg N/l and 1.5 mg P/l if the right oxidation ditcb combination is used.

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