Best Operating Conditions for Biogas Production in Some Simple Anaerobic Digestion Models
Résumé
We consider one-step and two-step simple models of anaerobic digestion which are able to adequately capture the main dynamical behavior of the full anaerobic digestion model ADM1 and has the advantage that a complete analysis for the existence and local stability of their steady states is available. We describe the best operating conditions for biogas production in these simple anaerobic digestion models. We study also the best operating conditions for biomass production in the simple one-step model. We provide the subsets of best operating conditions in the operating diagram of the model. This set gives a clear graphical description of the best operating conditions. Our models incorporate biomass decay terms, corresponding to maintenance. The growth functions are general and are characterized by their qualitative properties. Numerical plots with specied growth functions and biological parameters illustrate the obtained results.
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