A New Approach for Modelling Biological Wastewater Treatment Plant by Multiple Model

The present work proposes a new approach in modelling the biological wastewater treatment plant: The anaerobic digestion by multiple models. Although a mathematical model already exists, but the interaction between the various variables is strongly not linear and is modelled in the form of rather complex algébro-differential equations. So, by using the method of subtractive clustering, the multiple model approach consists, from a natural grouping of input/output data, to model the behavior of the system locally and under a more exploitable mathematical form by tools already developped for the automatic of linear systems. Two fundamental stages are necessary for elaborating the multiple model by the proposed approach. A stage of calculating the number and the validity domain of local models, then a stage which consists in identifying the parameters of these local models.