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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/106

Date Added: 7-Sep-2007
Abstract: The economic and technical feasibility of poultry manure to methane conversion using anaerobic digestion and electricity generation was studied in ELFORA poultry farm in Debre Zeit, Ethiopia using three sets of data; chemical analysis of wet manure, annual on farm wet poultry manure production and annual electric consumption of the poultry farm. Total solids (% wet), volatile solids (% TS) and PH were analyzed as reported in Standard Methods ASTM and AOAC publications. Phosphorus was analyzed using Hatch Analysis system. Ultimate analysis of carbon, nitrogen, hydrogen, oxygen and sulfur were done using elemental analysis method. The result shows low carbon nitrogen ratio of the manure indicating that wet poultry manure easily ferments in anaerobic digestion. The estimated daily volume of wet manure generated on farm is 27,397kg on average. The amount of nitrogen and phosphorous in the slurry was estimated to be 97.8 kg and 96.94 kg respectively from 4328 kg of dry matter which constitutes a good fertilizer potential . The estimated methane production with loading rate of 3.03 kg VS per meter cube is 655meter cube per day for complete mix digester, 807meter cube with loading rate of 4.8kg VS per meter cube for plug flow digester and 605 meter cube with loading rate of 0.39kgVS/m3 for covered lagoon digester was estimated. Poultry manure with high content of VS and nitrogen can have high methane yield on site, which could be used to fuel an engine/ generator of 86kw, 94kw and 115kw for complete mix, plug flow and covered lagoon digesters respectively. The carbon dioxide equivalents of the maximum methane generated on-farm were calculated to be 3.739kt per year. This yield was found to be equal to the carbon dioxide emitted from the distraction of 1,402 acres forestland. The calculated annual energy equivalent of the yield is 12.37-tera joule with a calorific value of 2.95 tera calorie and 295 Toe. Economics of anaerobic digestion for all three types of digesters show positive NPV indicating that on farm anaerobic digestion is feasible.
Description: A Thesis Submitted to the School of Graduate Studies of Addis Ababa University in Partial Fulfillment of the Requirements for the Degree of Master of Science in Environmental Science
URI: http://hdl.handle.net/123456789/106
Appears in:Thesis - Environmental Sciences

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