Inventory of biodigesters for the biogas project in the Prefecture of Macenta, Republic of Guinea

This research is part of the environmental and energy impact assessment of the biodigesters of the Biogas 2016 Project in Macenta. The methodological approach consists of conducting a survey of biodigester owners. The data collected using the "Kobo-collecte" software were processed using QSIS 3.24 and SPSS software, yielding the following results: Of the 114 biodigester owners, 87.72% are men and 12.28% are women, with 4.39% of biodigesters being functional and 95.61% non-functional. Biodigester malfunctions are due to cracks causing water ingress in 52 out of 109 biodigesters (47.71%), soil structure issues, a lack of animal manure in 29 biodigesters (27.52%), and odors. 15 users of biodigesters suffered from a lack of protective equipment and were exposed to odor pollution (17.43%), while those of 9 biodigesters were experiencing a labor shortage (7.34%). During the project, the fuels used were as follows: biogas and charcoal (60.53%), biogas (17.54%), firewood (13.17%), and biogas and firewood (8.77%). During the project, 67% of biodigester owners transformed the digestate into compost, while only 4% transformed these residues into biopesticides, and 29% did not use any method of recovery. After the project, the abandonment of biodigesters led to a return to the excessive use of firewood (54.39%), followed by charcoal (27.19%), firewood and charcoal (14.04%), and finally biogas and charcoal (4.39%). Following the project, of the 62 owners of biodigesters using only firewood as cooking fuel, 40 were women and 22 were men, representing 64.52% and 35.48% respectively.