A program surface was created to simulate the effluent behavior of a sewage plant online by coupling the dynamic simulation with the process system. Standard software was used and the activated sludge process was described by the IAWQ activated sludge model no. 1. A method was developed, by which the 13 substance groups of the IAWQ model are calculated on a few online values (Q, BOD-M3, NH4-N) with the use of multivariate regressions. Using the average values from 15 min cycles, a continuously updated inflow file for the simulation of the sewage plant is created. Additional to the online simulation a prediction simulation can be performed, based on the current online-state. This allows projection of the effluent concentration in different inflow situations.

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