Model based selection of an appropriate control strategy application to ananaerobic digester

The aim of this work is to develop an integrated control of anaerobic diges ters in wastewater treatment plants, to ensure optimal depollution performa nces. To achieve this goal, we have to summarise our knowledge in a mathema tical model, which is an essential tool for control design. Various control strategies can be chosen, but their performances are very different (stabi lisation, biogaz production,..). Each of them is evaluated through 3 criter ia. Then we present an original linear model for process stability which ta ke into account the input pollution (flow rate, concentration). We show wit h simulations how this model help us to select the appropriate control stra tegy and the improvement of depollution efficiency.