Determination of biogas yield from co-digestion of cow and goat dung | Abstract
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Determination of biogas yield from co-digestion of cow and goat dung

Author(s): Wante H. P., Wante S. P. and Galadima A. I.

This study was carried out to assess and determine the biogas yield from cow and goat dung. Biogas yield assessment was carried out at room temperatures (26.0– 30.0 °C) for a period of 20 days from a solid dung mixture of 1000 g in each sample (fermentation slurry) left to ferment over 35 days. The objectives were to determine cow and goat dung ratio that give optimal output and to model the relationship between cow:goat dung ratio and the output which can be used to predict gas yield at various ratios. Three samples composed of a ratio of cow to goat dung were prepared to make sample D1 (100:0), D2 (75:25) and D3 (50:50). Fermentation occurred in a water dispenser container of 20 litre capacity used as the improvised digester and the temperature of the digesting chamber noted over the fermentation period of 20 days. A constructed metallic prototype digester was used for the collection of biogas produced. Preliminary studies showed that biogas release started to decline at the tenth day of the fermentation period for almost all samples. Sample D2 (75 % by weight cow dung and 25 % by weight goat dung) showed the highest biogas production (361.00 ml) at the end of fermentation. A portion of sample D2 was transferred into the constructed prototype digester and the gas produced was collected into the gas cylinder for determination of volume collected. A mathematical model derived using regression analysis on MATLAB software indicates that biogas production can be predicted based on a dung concentrate.