Abstract
Kiteezi landfill site is the main solid waste dumping site in Kampala City (Uganda). In this study, the generation of methane from waste at Kiteezi landfill was measured using laboratory-scale anaerobic digestion experiment and estimated using the Mass balance model. The samples were collected in the wet and dry seasons, with five replicates for each season which were processed for further experiments focused on moisture content analysis and anaerobic digestion. The moisture content analysis results showed a significant change (P < 0.05) between wet season and dry season. Also, the anaerobic digestion revealed that moisture content was a determining factor in gas generation. The average monthly methane production estimate from the mass balance model was 1.63 Gg methane/month and was comparable (within 14%) to the amount estimated by laboratory-scale anaerobic digestion experiment (1.43 Gg methane/month). It is a worthwhile undertaking to further investigate the potential of commercially producing methane from Kiteezi landfill as an alternative source of green and clean energy for urban masses. Key words: Solid waste management, methane generation, anaerobic digestion and mass balance model.
Highlights
Kampala Capital City Authority (KCCA) is in charge of solid waste (SW) management
The high variation in organic waste composition especially from residential and market zones is unique to Kampala, but makes it Mboowa et al 743
Solid waste disposed at Kiteezi landfill mostly comprised of bio-degradable waste which has high methane gas production potential
Summary
Kampala Capital City Authority (KCCA) is in charge of solid waste (SW) management. About 28,000 tons of the waste is delivered monthly to Kiteezi landfill, but this is only 40% of the overall waste generated in Kampala (Komakech et al, 2014). KCCA still faces a challenge on how to manage the waste effectively and appropriately.
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