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S. Winkler, K. Svardal, H. Kroiss:
"Simulation as a Tool for Operational Support and Control Concept Evaluation";
Vortrag: Enviro 2002 Convention & Exhibition and IWA World Water Congress, Melbourne, Australia (eingeladen); 07.04.2002 - 12.04.2002; in: "Proceeding auf CD", paper no.: e20956a (2002), S. 1 - 8.

For the new Vienna WWTP (4 Mio. PE) which will be a two stage activated sludge plant with special operational modes for optimising the nitrogen removal performance a simulation study of the full stage plant is presented. The simulation study focuses on the comparison of different operational modes and the evaluation of different control
strategies. Although an uncritical load case was chosen (median loading, T = 15 °C) it can be shown, that through the application of dynamic simulation a lot of information about the plant operation can be gained, which is not accessible by means of on-line measurements
or laboratory analysis. This is especially true for evaluating long term effects like the development of the sludge age in the nitrifying second stage due to changes of the organic load. The additional information is very valuable for the choice of the best operational
mode or control strategy. Effects of foreseeable operational disturbances can be evaluated, revision operation can be planned carefully.
Modelling of a two stage activated sludge plant is a difficult task, due to the completely different load conditions and subsequently the different sludge population in the two stages. In the presented simulation study the `asmVienna’-model was used, which combines carbon degradation concepts like they are included in ASM1 and ASM3.