Abstract: Society is today confronted with dwindling and depletion of fossil fuel , green house emission and the proliferation of wastes
generated by municipalities, agriculture and industries.The conversion of these wastes to biogas will help in mitigating the above challenges. These
challenges have necessitated research on the comparative study of the production of biogas from biodegradable organic wastes: elephant grass,
maize cub, maize chaff and saw dust in the presence of yeast at room temperature(25oc) and slurry condition of ratio 4g to 30cm3.Elephant grass,
sawdust, maize cub and maize chaff were dried in the sun for about two weeks and ground to fine particles separately in different mortals. 4g of
each sample was weighed separately and placed in different digesters. 0.6g of yeast and 30cm3 of water was added to the samples in the four
different digesters. The results showed that maize curb produced 245 cm3 of biogas, elephant grass produced 235 cm3 of biogas, sawdust and maize
chaff produced 116 cm3and 670 cm3 of biogas respectively. Maize chaff was found to produce the highest yield of biogas. Therefore, for maximum
production of biogas, maize chaff is preferable above others. The graphs plotted show a similar pattern. it increases gradually for the first few
days and a sudden rise as the days progress and finally reach a plateau(constant).
KEY WORD: Comparative, biodegradable, Slurry, organic waste, Biogas, yeast and digester.jaerem NEW Akintola T 25A
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