Nishimwe, AnicetSous la direction de : Prof. Aloys KatihabwaDr. Pierre Ntakiyiruta (Co-directeur)2025-11-052025-11-052025-03https://repository.ub.edu.bi/handle/123456789/2126Mémoire présenté et défendu publiquement en vue de l’obtention du Diplôme de Master en Sciences Chimiques Spécialité : Contrôle et Analyses ChimiquesThe excessive consumption of fossil fuels as a primary energy source has led to global climate change, pollution and environmental degradation, resulting in human health problems. In addition, waste, mainly from agriculture, the food industry and households, is increasingly produced due to population growth and industrialization. The dumping of this waste in uncontrolled dumps and landfills causes significant environmental impacts including greenhouse gas emissions, soil and water pollution.The objective of this study was to evaluate the energy potential of organic waste (coffee pulp and potato peelings) by biomethanization. The biomethanization process was carried out in batch mode and different physicochemical parameters were measured before and after anaerobic digestion according to standard methods. This digestion was carried out in 4-liter digesters into which 2.5 kg of the Substrate/Inoculum mixture was introduced. For this purpose, 3 scenarios of the substrate-inoculum mixture including coffee pulps alone, potato peels alone and their mixture in the ratios 3/1, 1/1 and the control were carried out. The results show that the ratio 3/1 generates a high production of biogas for coffee pulps (49580ml of biogas with a methane composition of 67.9%). The mixture of coffee pulps - potato peels in the ratio 1/1 produced 44280 ml of biogas with a methane composition of 72.8% methane, while the potato peels, in the ratio 3/1, produced 26030 ml of biogas with a methane composition of 66.9%. It should also be noted that the coffee pulp-potato peelings mixture in its control report generated 23280ml with a methane composition of 67.8%. In terms of methane yield, the coffee pulp-potato peel mixture produced more methane than the other scenarios (67.8%, 77.57%, 72.8%) for the control, the S/I ratio 3/1 and the ratio 2/2, respectively. This significant production could be used by the population as energy for cooking and lighting.