Characterization of Biogas Digestate for Solid Biofuel Production in Uganda

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dc.contributor.authorOgwang, Isaac
dc.contributor.authorKasedde, Hillary
dc.contributor.authorNabuuma, Betty
dc.contributor.authorKirabira, John Baptist
dc.contributor.authorLwanyaga, Joseph Ddumba
dc.date.accessioned2022-06-08T12:08:44Z
dc.date.available2022-06-08T12:08:44Z
dc.date.issued2021
dc.description.abstractIn this study, suitability of digestate from anaerobic digestion of cow dung, pig dung, and human waste feedstock as a solid fuel for thermal applications was investigated. The digestate was obtained at different retention times from laboratory scale and household digesters and later characterized. Carbonized briquettes were produced from the digestate followed by their physico-chemical characterization and assessment for combustion and mechanical properties. Results of the proximate analysis of the digestate were: moisture content (6.1 to 18.3%), volatile matter (27.9 to 47.7%), ash (15.0 to 48.9%), and fixed carbon (9.1 to 17.1%). The ultimate analysis results for the digestate were: carbon (19.5%), hydrogen (3.3%), oxygen (20.8%), and nitrogen (7.0%). The developed briquettes showed a moisture content, volatile matter, ash, and fixed carbon in the range of 3.7 to 8.9%, 9.9 to 21.5%, 45.6 to 76.4%, and 8.2 to 22.8%, respectively. Their ultimate analysis results were: carbon (21.1%), hydrogen (1.3%), oxygen (1.8%), and nitrogen (1.9%). The briquette combustion properties revealed an ignition time, burning rate, and water boiling time of 5.35 seconds, 0.16 g/min, 31.1 minutes, respectively with higher and lower heating values of 14.87 and 7.88 MJ/kg, respectively. The briquette ash compounds were sodium 1718.5 ppm, potassium 20017.8 ppm, copper 6.12 ppm, cadmium 1.22 ppm, and lead 25.6 ppm. TGA/ DTG analysis indicated high mass loss rates at 105°C and maximum energy release between 600 and 900°C. The mechanical compressive strength was between 19 and 50 MPa, with bulk density between 1.82 and 2.02 g/cm3. Thus, the briquettes from the biogas digestate demonstrate potential for domestic thermal applications in Uganda.en_US
dc.identifier.citationOgwang, I., Kasedde, H., Nabuuma, B., Kirabira, J. B., & Lwanyaga, J. D. (2021). Characterization of Biogas Digestate for Solid Biofuel Production in Uganda. Scientific African, 12, e00735.https://doi.org/10.1016/j.sciaf.2021.e00735en_US
dc.identifier.issn2468-2276
dc.identifier.urihttps://nru.uncst.go.ug/handle/123456789/3828
dc.language.isoenen_US
dc.publisherScientific Africanen_US
dc.subjectBiogas; Digestate; Carbonized Briquettes; Characterization Solid; Biofuelen_US
dc.titleCharacterization of Biogas Digestate for Solid Biofuel Production in Ugandaen_US
dc.typeArticleen_US
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