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Robust Feedback Control Designfor a Nonlinear Wastewater Treatment Model

Published online by Cambridge University Press:  02 October 2009

M. Serhani ,
N. Raissi  and
P. Cartigny
M. Serhani*
Affiliation:
FSJES, University My Ismail, B.P. 3102, Toulal, Meknes, Morocco
N. Raissi
Affiliation:
EIMA, FS, University Ibn Tofail, B.P. 133, Kénitra, Morocco
P. Cartigny
Affiliation:
GREQAM, University la Méditerranée, 2 rue de la Charité, 13002 Marseille, France
*
mserhani@hotmail.com
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Abstract

In this work we deal with the design of the robust feedback control ofwastewater treatmentsystem, namely the activated sludge process. This problem is formulated by anonlinearordinary differential system. On one hand, we develop a robust analysis when thespecific growthfunction of the bacterium μ is not well known. On the other hand, when alsothe substrate concentrationin the feed stream s in is unknown, we provide an observer of system andpropose a designof robust feedback control in term of recycle rate, in order to keep thepollutant concentration lowerthan an allowed maximum level s d .

Keywords

wastewater treatmentdynamical systemsstabilityrobustnessfeedback controlactivated sludge

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