Author(s): Michael Meister; Christoph Bergmeister; Daniel Winkler; Wolfgang Rauch
Linked Author(s): Michael Meister
Keywords: Activated sludge model; CFD in wastewater treatment; Smoothed particle hydrodynamics; Wastewater hydraulics
Abstract: In this work a novel wastewater treatment model based on smoothed particle hydrodynamics is proposed. To account for the biokinetic processes the activated sludge model (ASM) number 1 is used. Since the local hydrodynamics are neglected in the original model, ASM1 is coupled to the wastewater hydraulics, which are simulated with weakly compressible smoothed particle hydrodynamics. In the aerobic reactor the stirrer induced mixing of the biokinetic compounds is modelled with external forces. In the anoxic reactor the bubble induced mixing is described by a novel multifluid formulation, which allows for resolving the collective movement of rising air bubbles at a coarse resolution of 4 to 8SPH particles per bubble. With the new algorithm the simulation times of biokinetic processes can be attained and hence we present results for a full scale treatment plant simulation conducted with the coupled solver.