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Received May 23, 2003
Accepted July 25, 2003
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Nonlinear Model-based Dissolved Oxygen Control in a Biological Wastewater Treatment Process
BIOMATH, Department of Applied Mathematics, Biometrics and Process Control, Ghent University, Coupure Links 653, B-9000 Gent, Belgium 1Department of Chemical Engineering, Pohang University of Science and Technology, San 31 Hyoja-Dong, Pohang 790-784, Belgium
Korean Journal of Chemical Engineering, January 2004, 21(1), 14-19(6), 10.1007/BF02705375
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Abstract
The dissolved oxygen (DO) concentration has been an important process parameter in the biological wastewater treatment process (WWTP). In this paper, we propose a nonlinear control scheme to maintain the dissolved oxygen level of an activated sludge system. Without any linearization or model reduction, it can directly incorporate the nonlinear DO process model with on-line estimation of the respiration rate (R) and the oxygen transfer rate (KLa). Simulation results show that it outperforms a control performance of the PID controller. Since it incorporates the_x000D_
process disturbance and nonlinearity in the controller design, the suggested method can efficiently deal with the operating condition changes that occur frequently in the wastewater treatment process.
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References
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Carlsson B, Lindberg CE, Hasselblad S, Xu S, Water Sci. Technol., 33, 325 (1996)
Weyer E, Bell G, Lee PL, J. Process Control, 9(4), 357 (1999)
Holmberg U, Olsson G, Andersson B, Water Sci. Technol., 21, 1185 (1989)
Lee PL, Sullivan GR, Comput. Chem. Eng., 573 (1988)
Lindberg CF, Carlsson B, Water Sci. Technol., 34, 135 (1996)
Lindberg CF, "Control and Estimation Strategies Applied to the Activated Sludge Process," Ph.D. Thesis, Uppsala University, Stockholm, Sweden (1997)
Ljung L, "System Identification," Prentice-Hall, Englewood Cliffs, NJ (1987)
Marsili-Libelli S, Voggi A, J. Biotechnol., 52, 181 (1997)
Olsson G, Newell B, "Wastewater Treatment Systems: Modeling, Diagnosis and Control," IWA publishing (1999)
Signal PD, Lee PL, Chem. Eng. Commun., 115, 35 (1992)
Tenno R, Uronen P, Automatica, 32(3), 305 (1996)
Yoo CK, Cho JH, Kwak HJ, Choi SK, Chun HD, Lee I, Water Sci. Technol., 43(7), 207 (2001)
Yoo CK, Lee I, Korean J. Chem. Eng., in revision (2003)
