Preparation of Biogas from Plants and Animal Waste

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Author(s) S. T. Ubwa | K. Asemave | B. Oshido | A. Idoko
Pages 480-485
Volume 2
Issue 6
Date June, 2013
Keywords Biogas, Steculia Setigera, Grewia mollis, Lannea sp, Ficus Capensis, Ficus Trichopoda and Piliostigma Thonnigii

The study investigated biogas potentials of six different plants, Cow rumen liquor, Cowpea, and poultry waste. The Slurry used was prepared by mixing 60 g of plants sample with 20 g of chicken dropping in the ratio of 3:1 W/W (weight for weight). These were moistened with varying volumes of pre – warmed water at 37 oC. The results show nonlinear production of gas during the retention period of 16 days, with corresponding increase in cumulative volume of biogas. Digesters containing Steculia Setigera and Grewia mollis produced cumulative volumes of 267 cm3 and 245 cm3 respectively; while Lannea sp, Ficus Capensis, Ficus Trichopoda and Piliostigma Thonnigii produced cumulative volumes of 241, 185, 181 and 95cm3 respectively. The entire samples produced biogas at early retention time not later than 10 days. The results are such that the higher the lignin contents in the plants, the lower its biogas yield. Low moisture contents (9.1 – 4.6 %) of was observed for all the samples. The pH range of 7.53 – 6.80 was found for the samples’ slurry. The pH of 7.53 was associated with the sample with highest cumulative volume of biogas. The range 49.02 – 41.18 % was observed as the ash contents for the materials used. These plants have good potentials as biogas producers. Therefore details studies of biogas production should be done on them and subsequent commercialization.

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