Consistency Techniques for Simulation of Wastewater Treatment Processes with Uncertainties
| Authors: | Kletting Marco, University of Ulm, Germany
Rauh Andreas, University of Ulm, Germany
Aschemann Harald, University of Ulm, Germany
Hofer Eberhard P., University of Ulm, Germany |
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| Topic: | 8.4 Control of Biotechnological Processes |
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| Session: | Control of Biotechnological Processes |
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| Keywords: | consistency, Intervals, uncertain dynamic system, simulation, water pollution, discretization |
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Abstract
In this paper, interval simulation methods are presented to determine guaranteed enclosures of state variables of an activated sludge process in biological wastewater treatment. This process is characterized by nonlinearities and uncertain but bounded parameters. In uncertain systems an axis-parallel interval box is mapped to a complexly shaped region in the state space that represents sets of possible combinations of state variables. The approximation of this complex region by a single interval box causes accumulation of overestimation over simulation time. The algorithm presented in this paper minimizes this so called wrapping effect by applying consistency techniques, to avoid safety-critical states.
