Abstract
Energy is one of the most important needy resources that found in the form of renewable and nonrenewable sources. The world demand for energy grows rapidly, and therefore, it is a time to look alternative and renewable energy resources to replace the rapidly depleting supply of fossil fuels. This study is aimed at analyzing the effects of temperature (°C), retention time (days), and potential of animal waste on the biogas production and its %CH4 compositions as responses to the factors of the study. The materials used in this study were cow dung, sheep, and pig manures. Anaerobic batch digesters (plastic water bottle) with a total volume of 2000 ml were used as digester (bioreactor) in this experiment. The glucose drip (tube) was fitted to the lids of each digester. Average temperature of digester was increased starting from the 6th to 10th day in cow dung and sheep manure. In this experiment, optimum time for best biogas yield was recorded. Analysis of the gas component shows the significant volume of methane component recorded in cow dung (66.9%) followed by sheep manure (62.1%). Cow dung was one of the best in producing biogas, while the sheep manure was medium, and pig manures are fewer producers as compared to others.
Highlights
Energy is one of the most important needy resources that found in the form of renewable and nonrenewable sources
Biogas was first introduced in Ethiopia by Ambo Agricultural College (Recent Ambo University) around 1957 to supply the energy for welding agricultural tools, and in the 1970s, two biogas plants were introduced by the Food and Agriculture Organization (FAO) as pilot projects to promote the technology [7]
This study was conducted at Ambo University which is located in West Shoa Zone Oromia Regional State in Ethiopia and lying between 8056′30′′-8059′30′′N latitude and 37047′30′′-37055′15′′E longitude
Summary
Energy is one of the most important needy resources that found in the form of renewable and nonrenewable sources. The world demand for energy grows rapidly, and it is a time to look alternative and renewable energy resources to replace the rapidly depleting supply of fossil [4, 5]. The total production volume of biogas in developing country is still relatively low. Such slow development raises a fundamental question—what are the current barriers hindering the wider uptake of biogas as a source of energy [6]. In Ethiopia, even if the production of biogas started in the last long year, still there are too much need to optimize the biogas resources, adoption, and technologies that will ease the burden for women and children who spend up to 10 hours a week gathering wood in some rural areas to reduce indoor pollution and improve prospects for small farmers [8]. This study is aimed at analyzing the effects of temperature (°C), retention time (days), and potential of animal waste
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