Modelling of an Anaerobic Digester: Identification of the Main Parameters Influencing the Production of Methane Using the Sobol Method

Anaerobic digestion is a promising method of organic waste valorisation, particularly for fish farm waste, which has experienced high growth rate in recent years. The literature contains predictive mathematical models that have been developed by various authors, allowing the prediction composition bio-gas production from waste. In general, Monod’s kinetic expression basis describing enzymatic reaction rates anaerobic digestion. this work, several parameters are taken into account, such as temperature, cell inhibition, and other operating parameters, systems differential equations coupling kinetics stoichiometry bio-reactions applied to better describe dynamics. Because number initial need be defined digester, use model requires significant resources long calculation time. For reason, global sensitivity analysis (GSA) based on Sobol index method, order identify most influential key interactions between them. it observed influencing methane lipid concentration hydraulic retention time (HRT).