Simultaneous COD and VFA unmeasured process inputs estimation in actual anaerobic wastewater treatment processes
2017
Alcaraz-Gonzalez, Victor | Jauregui-Medina, E. A. | Steyer, Jean-Philippe | García-Sandoval, J. P. | Méndez-Acosta, H. O. | Gonzalez-Alvarez, V. | CUCEI - Departamento de Ingeniería Química ; Universidad de Guadalajara | Área de Ciencias Básicas e Ingenierías ; Universidad Autónoma de Nayarit | Laboratoire de Biotechnologie de l'Environnement [Narbonne] (LBE) ; Institut National de la Recherche Agronomique (INRA)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro) | CONACyT (CB- 2008-01/101971) ; European Union (FP7, IRSES program) (FP7-PEOPLE-2011-IRSES/295170)
A Virtually Controlled Observer (VCO) was proposed to estimate both, the unmeasured states and the unknown inputs (influent substrate concentrations: Chemical Oxygen Demand (DCO) and Volatile Fatty Acids (VFA) in a 1 m3 up-flow fixed-bed anaerobic digestion (AD) pilot plant. The VCO is developed without the full knowledge of the AD kinetics and consists of an asymptotic observer and an output feedback controller, in which, one of the observer inputs (the hypothetical -unmeasured- influent substrate concentration) is updated by a feedback control law, which is devised to regulate the estimation error of a measured output. Results show that the proposed observer is robust in the face model mismatch, load and operating conditions changes and sensor faults as it was able to reconstruct the influent substrate concentration.
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