Etude de potentiel méthanogène des boues de la station d’épuration de buterere
| dc.contributor.author | Ndayahoze, Gréad | |
| dc.contributor.author | Sous la direction de : Dr. Pierre Ntakiyiruta | |
| dc.date.accessioned | 2025-11-04T14:50:36Z | |
| dc.date.available | 2025-11-04T14:50:36Z | |
| dc.date.issued | 2025-03 | |
| dc.description | Mémoire présenté en vue de l’obtention du grade de master en sciences chimiques Spécialité : Contrôle et Analyse Chimiques | |
| dc.description.abstract | In the BUTERERE area there is a treatment plant that treats wastewater which, after treatment, leaves sludge made up of organic matter such as primary sludge; facultative sludge. The management of this sludge presents a serious environmental problem. It is with this in mind that a research study was conducted with a view to valorizing this sludge as renewable energy. Thus, samples of sludge among these different types of considered were taken into account for this research. Three Scenarios were considered taking into account the following ratios of proportions: The first scenario concerns primary sludge associated with its inoculum in the ratios (S/I) of 2/1, 3/1 and 4/1 and the control; the second scenario concerns facultative sludge associated with its inoculum in the same ratios of (S/I) 2/1, 3/1 and 4/1 and the control and finally the third scenario concerns primary sludge in reaction with facultative sludge in the same ratios of 2/1, 3/1 and 4/1 and control. The samples were collected from September 6th to October 31st, 2024 for the 1st scenario, followed by the 2nd scenario which started on October 19th until November 16th, 2024 and finally the 3rd Scenario started December 24th until January 18th, 2024. Thus, the physicochemical characteristics of the sludge and their methanogenic potential were evaluated, then the biogas production was optimized. The monitoring of the digesters lasted 25 days. The results of this study show that primary sludge in reaction with its inoculum presents a volume of biogas whose methane composition is 67.52%. The quantitative energy estimates are 393.26KW/t/year. On the other hand, in the case of mixing primary sludge associated with facultative sludge, quantitative energy estimates were 387.70KW/t/year, i.e. a percentile methane composition of 69.09%. In addition, the yield of primary sludge mixed with its inoculum produced a yield of 67.52% of methane production with an energy of 393.26KW/t/year. The volume of biogas obtained for the mixture of primary sludge and facultative sludge was 14860ml while for primary sludge mixed with inoculum is 15490ml. The best results are observed for digesters with a substrate/inoculum ratio (S/I) of 3/1 and 4/1 for (BP+I) and (BP+BF) respectively. Thus, the amount of biogas produced is (15490 ml) for primary sludge mixed with the inoculum from the BUTERERE wastewater treatment plant and had a methane percentage composition of 67.52%. In addition, a biogas quantity of 14860 ml for (BP+BF) without inoculum was produced. This is done to see the influence of facultative sludge in case of mixing with primary sludge and had a methane percentage composition of 69.09%, which are sufficient for electricity production. | |
| dc.identifier.uri | https://repository.ub.edu.bi/handle/123456789/2122 | |
| dc.publisher | UB, FS | |
| dc.title | Etude de potentiel méthanogène des boues de la station d’épuration de buterere |