Biochemical processes at wastewater treatment plant are complex, nonlinear, time varying and multivariable. Moreover, relationships between processes are very strong. One of the most important issues is exerting proper control over dissolved oxygen levels during nitrification phase. This parameter has a very large impact on activity of microorganisms in activated sludge and on quality of pollution removal processes. Oxygen is supplied by aeration system which consists of many nonlinear elements (blowers, pipes, diffusers). In this paper, the sequencing batch reactor is applied and modelled. Also, the aeration system is modelled. Those models are validated based on real data sets. The adaptive control system with anti-windup filter is proposed and designed for tracking the reference trajectory of dissolved oxygen. Furthermore, the reference trajectory of dissolved oxygen is generated by the supervisory controller using NH4 measurements. Simulation results of control system are calculated for a case study plant located in Swarzewo, Northern Poland.
aeration, adaptive control, cascade control, dissolved oxygen, nonlinear control, wastewater treatment.
Karol BŁASZKIEWICZ, Robert PIOTROWSKI, Kazimierz DUZINKIEWICZ, "A Model-Based Improved Control of Dissolved Oxygen Concentration in Sequencing Wastewater Batch Reactor", Studies in Informatics and Control, ISSN 1220-1766, vol. 23(4), pp. 323-332, 2014. https://doi.org/10.24846/v23i4y201402
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