Assessing Performance of Cattle Dung and Waste Cooked Foods in Producing Biogas As Single Substrate and Mixed Substrates in Kampala Uganda - Assessing Performance of Cattle Dung and Waste Cooked Foods in Producing Biogas As Single Substrate and Mixed Substrates in Kampala Uganda - Open Access Pub

Biogas is anaerobic degradation product formed from aqueous slurry of organic waste in a digester. It can be produced from cattle dung,(cd)chicken droppings, decaying leaves, kitchen waste foods(kwf), sewage sludge, slaughter house, goat, pig or sheep manure, Aqueous slurry of 200g/L of mixed or single substrate of cattle dung or/and kitchen waste evolved up to 400mL of biogas at ambient temperatures. The rate of gas evolution reached 5mL/day on the 15th day using 25% cd mixed slurry. The rates of degradation attained in the mixtures were 1.42ml/g for cd; 1.58mL/g for kwf; 1.78mL/g for 75% cd mixed substrate; 1.78mL/g for 50% cd mixed substrate; 1.92mL/g for 25% cd mixed substrate slurries. The comparative rate of biogas formation ranged from1.25 to 1.35 which was in agreement with the range published in literature of 0.8 to 5.5. Biogas can be synthesized efficiently at ambient temperature in Kampala as was done at mesophilic temperatures elsewhere. However, it may be necessary to attempt producing biogas at different pH and temperatures as well as using other substrates and inoculums. DOI10.14302/issn.2377-2549.jndc-19-2701 Biogas was defined as gas formed by biological decomposition of organic matter in absence of oxygen and it originates from biogenic materials so it is a biofuel. Interest in synthesis of gas formed by decomposing organic matter was first reported in the 17th century. Later it was found that gas produced from cattle manure and kitchen waste can be used for lighting and cooking in much the same as natural gas is used. It is now known that it contains up to 50% methane, a renewable source of energy that can be used for heating, generating electricity and other operations based on internal combustion engines 1. Biogas was reported as mixture of gases including methane, carbon dioxide, hydrogen and others 2, 3, 4. Whereas kitchen waste is any substance raw or cooked which is discharged or remains after 5 cattle dung is black-greenish material that passes out of the rumen of herbivores after feeding on grass and other materials 6. It was reported that digestion of kitchen waste as single substrate yielded 27% of gas 7 yet cattle dung as single substrate yielded 17.9%8 . There are variations in quantities of gas formed when single or mixed substrates are digested 9. The processes yielding biogas involve anaerobiosis whereby archaea bacteria, algae, fungi, protozoa and or viruses degrade organic matter. Bio digestion has been employed to treat organic wastes to recover renewable 1011. Anaerobiosis involves a series of processes in which