Biogas is a gaseous fuel obtained from waste fermentation, which is of interest in producing energy for electricity, cooking, heating, and biofuels for vehicles. It is a biological route that is catalyzed by the activities of microorganism in the absence of oxygen. Anaerobic digestion is a microbial process whereby organic carbon are converted by subsequent oxidation and reductions to its most oxidized state (CO 2) and reduced form (CH 4). In the midst of numerous renewable energy sources and their production means is the sustainable generation of biogas through anaerobic digestion technology. Introductionįor future energy security and improvement in the use natural resources, the depletion of conventional energy resources such as fossil fuel can be solved by the use of renewable energy sources. The developed plastic biogas digester has been found to be appropriate for biogas production using cow dung as substrate. In addition, the percentage concentration of methane and carbon dioxide were found to be 60% and 30%, respectively.
Results obtained showed a total volumetric methane gas yield of 2.18 m 3 (54.50%) and carbon dioxide yield of 1.77 m 3 (44.25%) making up a total biogas yield of 4.00 m 3. In the present study, a ventilation test was conducted after the fabrication to ensure the digester is leak free. The study was motivated due to some limitations such as leakage associated with previous designs. The digestion chamber of the biogas digester under study was fabricated using high-density polyethylene (HDPE) plastic, while the inlet and outlet chambers were constructed with bricks/cement. To establish this, a design equation covering the volume of the digester, inlet and outlet chambers, and digester cover plate were developed considering the shape of the digester. The aim of this study is to provide a detailed analysis of the design and fabrication of a 2.15 m 3 pilot plastic biogas digester for biogas generation. Biogas digester dimensions and materials of construction are important factors of consideration during the design and fabrication phase.
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