Observer-based output feedback linearizing control strategy for a nitrification-denitrification biofilter

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• 作者：I. Torres Zú ; ñ ; iga^a ; ^d ; ^{ixbalank@gmail.com} ; I. Queinnec^b ; ^c ; ^{queinnec@laas.fr} ; A. Vande Wouwer^a ; ^{alain.vandewouwer@umons.ac.be}
• 关键词：Nitrification&ndash ; denitrification biofilter ; Distributed parameter systems ; Hyperbolic PDE ; Parabolic PDE ; Linearizing control ; Luenberger observer ; Output feedback control
• 刊名：Chemical Engineering Journal
• 出版年：2012
• 期刊代码：16_13858947
• 类别：ce
• 出版时间：15 May, 2012
• 卷：191
• 期：Complete
• 页码：243-255
• 文件大小：1535 K

摘要

The objective of the present work is to propose an output-feedback control scheme for a wastewater treatment biofilter, in order to regulate the outlet concentrations of nitrate and nitrite below a prescribed level (in accordance with the norms). The nitrification-denitrification biofilter is described by a set of mass balance partial differential equations (PDEs), of hyperbolic or parabolic type, depending on the consideration of diffusion/dispersion phenomena. The design of the output-feedback control strategy follows a late lumping approach, in which the PDE system is considered, and descretized only at a later stage for implementation purposes. This strategy is based on feedback linearization and requires a state estimator, which takes the form of a distributed parameter Luenberger observer. A point of particular attention is the formulation of the model boundary conditions, from the classical Dankwerts conditions to more advanced formulations including dynamic boundary conditions, which has a significant influence on the control performance. The control strategy is tested against model uncertainties and measurement noise in simulation.