Browsing by Author "Nalinga, Y."

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    The effect of particles size on biogas production
    (2016) Nalinga, Y.; Legonda, I.
    The study on the effect of particles size on biogas produc-tion has been conducted. Substrates consisted of pre-treated water hyacinth with drying and grounded to fine particles of (0.001and0.05mm) and chopped water hyacinth to small particles of (1.0 and2.5 mm). The reactor digesters were operated atmesophilic temperature ranges of 25 °C to 32 °C with retention time of 23 days. Results showed that highest biogas production occurred with the most finely grounded substrate (0.001 mm) which recorded 0.39liters of biogas with 70 % CH4 followed by the grounded particles of 0.05 mm yields 0.34 liters with 66% CH4 .while the lowest bio-gas production was observed from the chopped particles of 2.5 mm producing 0.24 liters of biogas with 55% CH4. Fur-ther observation revealed that methane yields increased by 21% when the substrates were pre-treated by grinding into very fine particles compared with the chopped substrate. The results suggest that small particle size favours methane yield.
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    Experimental investigation on biogas production from anaerobic co-digestion of water hyacinth and fish waste
    (2016) Nalinga, Y.; Legonda, I.
    Co-digestion of various wastes and biomass feedstock has been shown to improve the digestibility of the materials and biogas yield. In this study,the co-digestion of water hyacinth and fish waste was studied at different mixing proportions. The anaerobic digestion was carried out in batch digester reactors sized 500 ml and were charged to 10 % of total vol-ume. Co-digestion was conducted for a retention period of 21days in mesophilic temperature ranging 25.3 °C to 33.4 °C. The research revealed that the highest biogas production was observed from the combination of FW:WH, at 1:2 ratio. The maximum biogas recorded was 0.56 literswith compo-sition of 73.3 % CH4. Furthermore, the water hyacinth also recorded0.46 literswith the composition of 70 % CH4which suggesteconomical feasibility. The overall results showed that blending water hyacinth with fish waste had significant improvement on the biogas yield.