In this paper the design data, flow sheets, operating results and running experiences of four municipal wastewater treatment plants are presented. The size of these plants varies between 95,000 and 830,000 people equivalents. Different activated sludge systems running with cascades and simultaneous nitrification/denitrification are practised in these plants. The data of these different plants are compared.

Dimensioning data, running experiences, simultaneous nitrification/denitrification, cascade, municipal wastewater, biological removal of nitrogen and phosphorus
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