Biogas Production from Cow Dung

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Samia Hamid Mohamed, Elamin
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Due to acute shortages of energy in Sudan, this research is carried out to contribute in solving this problem. Since biomass holds the most promising .potential as an energy resource, a simple technology could be utilized to supply energy, organic fertilizer and prevents environmental pollution. This is the biogas production technology. It produces a clean gas mainly consists of methane and. carbon dloxide, convenient to be used as fuel for cooking and lighting. This Investigation was pursued to examine the anaerobic fermentation mainly of cow dung to produce biogas at ambient temperatures. It is found that if cow dung in Sudan is digested (27 x 106 Tons of cow dung), 3.48 x 10 6 Tons biogas will be produced. This amount represents 62% of total household consumption in Sudan and 79% of total rural energy consumption. Sixteen laboratory experiments were carried out using fresh and dried cow dung, and three of them use cow dung and kitchen refuse. The experiments involved the effect of solid concentration, batch or continuous operation, mixing (shaking) and retention time as operational parameters on biogas production. Optimum condition of operation revealed that on batch operation optimum solid concentration is 9% when cow dung is mixed with kitchen effuse and at solid concentration of 9% the mixture ratio of solids should be 9: 1. Continuous operation at solid concentration of 10%produce maximum rate of biogas equal 0.33 m3 of gas/m3 digester volume/day. Mixing slurry daily for 30 seconds was found to be insignificant for small laboratory scale digesters. The optimum retention time for continuous operation is found to be 30 days and loading rate of 2.656 kg dry solids/m3 digester volume/day. The average of maximum methane percentage in biogas is equal to 78.56%.
Biogas, Production, Cow Dung