Physical experimentation of the productivity of biogas in the laboratory from putrescible waste

The methanization of organic waste for the production of biogas responds to several fundamental issues in rural areas of Chad. From an economic point of view, this solution offers a viable alternative to firewood, the excessive exploitation of which contributes to deforestation. By substituting biogas for wood, rural households not only reduce their energy costs, but they also become part of a dynamic of energy self-sufficiency. The valorization of residues in the form of biofertilizers constitutes another positive economic impact. These natural fertilizers enrich agricultural soils, thus improving yields while reducing dependence on chemical fertilizers that are often expensive and harmful to the environment. For our study, we collected samples of different food waste from local markets, sewage sludge from treatment plants for agricultural, human, animal, poultry and food waste from surrounding farms. The objective of this study is to determine the optimal parameters for the production of biogas from organic matter, with a view to efficient use for cooking and biofertilizer in rural Chad.

We were able to optimize the digestion conditions according to temperature, pH and retention time (RT) to maximize biogas production and ensure efficient conversion of organic matter. Then we used the digestates produced to improve soil fertility.