Field-Based Performance Evaluation of Three Household Biogas Digesters: the Case of Holeta, West of Addis Ababa, Ethiopia
| dc.contributor.advisor | Ebrahim Tilahun (PhD) | |
| dc.contributor.author | Tariku Messele | |
| dc.date.accessioned | 2025-05-14T09:30:45Z | |
| dc.date.available | 2025-05-14T09:30:45Z | |
| dc.date.issued | 2022-11 | |
| dc.description.abstract | Biogas is one of clean, and alternative renewable energy source obtained through anaerobic digestion of readily available organic waste materials. Ethiopian government have been actively engaged in disseminating biogas technologies into the country science 2009. Until Jan, 2022, total of 35,626 domestic biogas digesters were constructed through consecutive three phases. The biogas digester functionality rate is 79%, however only 30% of the constructed biogas digesters were functioning without significant problem. The performance of a biogas plant is mainly dependent on the input feedstock characteristics, the microbial activity (condition inside the bio-digester), and process conditions and parameters including pH., temperature, and etc. This study evaluated the performance of three household anaerobic bio-digester to which generates biogas from cattle dung. The bio-digesters selected through purposive sampling in Holeta west of Addis Ababa. The finding of the study indicated that the biochemical theoretical methane potential was 60%, while the actual methane percentage was 51%. The total solid, volatile solid, and chemical oxygen demand removals resulted as 37.7%, 26.7%, and 70.7%, respectively. The result shows lower digestibility, this is due to unstable alkalinity, temperature, and pH level. Sulfate-reducing bacteria had also an effects in the methanogenic bacteria’s performance. The maximum hydrogen sulphide amount contained in the biogas was 651 ppmv, which is caused by high sulfur content on the feedstock. The study concluded that improper management, lack of monitoring of installed biogas digesters, poor construction quality, are among the challenges that have derailed the sustainable implementation of, and household biogas production in the country. Unless these problems are addressed, the functionality rate of bio-digesters in Ethiopia could not been improved. | |
| dc.identifier.uri | https://etd.aau.edu.et/handle/123456789/5441 | |
| dc.language.iso | en_US | |
| dc.publisher | Addis Ababa University | |
| dc.subject | Anaerobic digestion | |
| dc.subject | cattle dung | |
| dc.subject | methanogenesis | |
| dc.subject | performance | |
| dc.subject | volatile fatty acid. | |
| dc.title | Field-Based Performance Evaluation of Three Household Biogas Digesters: the Case of Holeta, West of Addis Ababa, Ethiopia | |
| dc.type | Thesis |