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Biogas is produced from anaerobic digestion of biodegradable solid wastes in bio-digesters. Agricultural residues, comprising of animal manure and waste biomass, can constitute unfavourable environmental issues if not properly disposed. Studies aimed at converting these residues to energy need serious attention due to fast depleting rate of fossil fuel and its environmental hazard. Four cylindrical biogas digesters (A, B, C and D) of 0.052m 3  capacity each were constructed and fed with cattle dung, sunflower leaves, pawpaw and potato peels at different percentage composition. The experimental set-up was left for a retention period of 40 days, after which biogas production stopped. Results revealed that the percentage Organic Dry Matter (%ODM) of cattle dung, sunflower leaves, pawpaw and potato peels were 94.91, 95.92, 97.75 and 96.60 respectively. The total volume and methane contents of biogas produced from digester a, b, c and d were 46.64, 45.80, 39.55 and 38.02 m 3 , and 71.82 %, 53.71 %, 66.80 % and 52.70 %, respectively. Analysis also revealed that digesters A had the highest Fresh Mass Biogas Yield (FMBY), Organic Dry Matter Biogas Yield (ODMBY), Fresh Mass Methane Yield (FMMY), and Organic Dry Matter Methane Yield (ODMMY). The Higher Heating Values (HHV) of biogas obtained from digesters A, B, C and D were 6.931, 5.680, 6.679 and 5.549 kcal/kg, respectively.

journal of physics. conference series

Design and Construction of Air-Proof Metallic Digesters for Biogas Production from Varied Co-Digestion of Selected Agricultural Residue with Cattle Dung