Optimisation de la digestion anaérobie par plan d'expérience

Abstract

In the context of energy transition and sustainable waste management, this study aims to optimize the anaerobic digestion process of tomato residues, an abundant and biodegradable organic substrate. A scientific methodology based on a Box-Behnken experimental design combined with a two-factor interaction model (2FI) was adopted to rigorously assess the effect of three key variables: pH (6, 7, 8), dilution rate (0 / 25% / 50%), and volatile solids (TVS) ratio (0.16 / 0.33 / 0.5). Experimental results revealed that these parameters significantly influence biogas production. The best performance was observed at pH 6, a dilution rate of 25%, and a TVS ratio of 0.33. Statistical analysis (ANOVA) confirmed the validity of the proposed model and highlighted meaningful interactions between the studied factors. This work provides a better understanding of the optimal operational conditions for anaerobic digestion and offers a reliable predictive tool for future applications. The study represents a valuable contribution to the energetic recovery of organic waste, supporting the goals of circular economy and sustainable development.