For the extension of the WWTP Feldkirchen to 50.000 PE extremely strict limit values for the effluent concentrations had been set by the local authorities. According to conventional design rules (ATV A 131) a significant enlargement of the volume of the active sludge tanks would have been necessary for achieving these limit values. A previously developed concept, which was based on better utilizing existing tanks and optimizing the operation strategies, became unacceptable.
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Wasserverband Ossiacher See (Carinthia, Austria)Project name
Extension of the WWTP FeldkirchenThe problemOur solution
A dynamic simulation was developed and calibrated. Different extension concepts for the WWTP were validated and partly optimized in this simulation model. In this way, an economical concept of enlargement was found. Furthermore the authorities could be convinced, that the effluent concentrations will be below the stringent limit values.
After the commissioning of the new plant, the model was used to optimize the operating and control strategy for the biological stage, considering both process stability and energy efficiency.