For meeting the EU standards existing installations have to be upgraded to nutrient removal (nitrogen and phosphorus). One of these installations is the WWTP of the city of Bruges. In the process design phase of the WWTP a pilot study and dynamic modelling are used to optimise the dimensions of the different tanks. To minimise the load overflowing in the collector system it is decided to increase the maximum flow through the WWTP using a storm water regime in the aeration tank.

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