Design, construction, and performance evaluation of plastic biodigester and the storage of biogas / V.A. Ezekoye, M.Sc., and C.E. Okeke.

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YJ2020 M03

This paper reports on the generation of biogas using spent grains and rice husk, mixed together. A 300 gallon plastic biodigester was designed, constructed, and used to obtain biogas from these wastes. Fifty percent (50%) of spent grains were mixed with fifty percent (50%) rice husk and this mixture was charged in one to three ratio (1:3, waste and water). The digestion of the slurries was undertaken in a batch operation. All of the parameters necessary for gas production were monitored and recorded. The wastes started producing combustible gas 20 days after they were charged. The maximum volume of biogas obtained from the wastes was 150 litres on the 47th day. Observation shows that rice husk increased the number of microbes in the spent grains and quickened its gas production. It was discovered that the waste has a longer retention time. The conditions within the digester suitable for the anaerobic microbes were under mesophllic temperatures (20-45oC). The biogas produced in this study were compressed and stored in a cylinder and can be moved from one place to another for a wide range of applications.