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This paper deals with the design and analysis of new robust-adaptive control schemes for a class of anaerobic wastewater treatment processes. The design procedures are developed under the realistic assumption that the bacterial growth rates are unknown and the influent flow rates are disturbed, but some lower and upper bounds – possibly varying with time – of these uncertainties are known. Firstly, a new state asymptotic observer is designed, and secondly a robust observer for a class of bioprocesses is presented. Using these observers, a new robust-adaptive control scheme is developed and analyzed. This approach is applied to a particular wastewater treatment bioprocess based on anaerobic fermentation and the effectiveness of the designed algorithms is validated by several numerical simulations.
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