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Abstract
A hierarchical controller for tracking the dissolved oxygen reference trajectory in activated sludge processes is proposed and investigated. The removal of nitrogen and phosphorous from wastewater is considered. Typically, an aeration system itself is a complicated hybrid nonlinear dynamical system with faster dynamics compared to the internal dynamics of the dissolved oxygen in a biological reactor. It is a common approach to neglect these dynamics and also important operational limitations of this system, such as the limits on the allowed frequency of switching of the blowers and on their capacity. The paper proposes a two level controller to track the dissolved oxygen reference trajectory. The upper level control unit generates trajectories of the desired airflows to be delivered to aerobic zones of the biological reactor. A nonlinear model predictive control algorithm is applied to design this controller. The lower level controller forces the aeration system to follow these set - point trajectories. The predictive control is also applied to design the lower level controller based on piecewise linearized hybrid dynamics of the aeration system. The overall hierarchical controller is validated by simulation based on real data records.W artykule zaproponowano i zbadano hierarchiczne optymalizujące sterowanie stężeniem tlenu w procesach osadu czynnego. Uwzględniono procesy usuwania azotu i fosforu ze ścieków.
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- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
CONTROL ENGINEERING PRACTICE
no. 16,
pages 114 - 131,
ISSN: 0967-0661 - Language:
- English
- Publication year:
- 2008
- Bibliographic description:
- Piotrowski R., Brdyś M., Konarczak K., Duzinkiewicz K., Chotkowski W.: Hierarchical dissolved oxygen control for activated sludge processes// CONTROL ENGINEERING PRACTICE. -Vol. 16, nr. 1 (2008), s.114-131
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.conengprac.2007.04.005
- Verified by:
- Gdańsk University of Technology
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