This work aims to transpose the experimental results obtained in the laboratory to an industrial anaerobic digestion unit with a capacity of 18 m3, taking into account the optimal proportions of substrate, inoculum and water. From a 500 mL digester having been subjected to an anaerobic digestion process of cow dung with the addition of two distinct biochars and a filling rate of 80%, a proportional extrapolation allowed us to estimate the quantities of inputs for the 18 m3 industrial digester as well as the biogas production, in other words the methane yield of this reactor. The mixture used included 2,883 kg of cow dung substrate, 8,205 kg of digested cow dung inoculum, and two types of biochar added at approximately 1% of the substrate: peanut shell biochar (29.96 kg) or oyster shell biochar (28.64 kg). Peanut shell biochar (PSB), derived from peanut shells, proves particularly effective, reaching 63.79% methane compared to 51.03% for the control and 61.23% for oyster shell biochar (OSB), thanks to its porous structure and its ability to stimulate methanogenic communities. Economically, the use of methane for electricity and the digestate as organic fertilizer generate increasing revenues, reaching more than 160 million FCFA in year 5, with a return on investment less than four years. Furthermore, the project contributes to the reduction of greenhouse gas emissions, with nearly 900 kg of CO₂ avoided thanks to biogas and an additional 295 kg for the digestate.