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Study on the production of renewable biogas energy from cactus branches
By Elias Jigar1*, Hameed Sulaiman2 and Araya Asfaw2 and Abraham Bairu3 (2011)
1. Faculty of Dryland Agriculture, Samara University, Afar Region, Ethiopia.
2. Addis Ababa University, Environmental Sciences Program, Addis Ababa, Ethiopia.
3. Tigray Agency for Science and Technology, Mekelle, Tigray Region, Ethiopia.
Abstract
In this study, Cladodes, a plate-like part of Cactus Figtheir physical properties, total solids (TS) and volatile solids (VS) were characterized and their suitability for biogas production in a 2.8 L triple batch digester was evaluated in five combinations with or without cow manure. The highest total biogas production was obtained by T5 (75% cow manure: 25% Cladosporium combination) at 14.183 L, followed by T1 (cow manure only) at 13.670 L (0.022 m3/kg), and the lowest was T2 (Cladosporium only) at 6.176 L. During the experiment, the percentage of methane gas obtained by T1, T2, T3 (50% cow manure: 50% Cladosporium), T4 (25% cow manure: 75% Cladosporium) and T5 treatments were 66.33%, 53.16%, 63.84%, 52.1 and 69%, respectively.
Among all the treatments, T5 produced biogas with a higher methane content. Treatments with C:N ratios in the range of 20 to 30 (T1 and T5) performed better than other treatments in terms of biogas production and methane production. Statistical tests showed that, except for T1 and T3, the biogas and methane content in the gas produced by T5 was significantly different at the 0.05 level, which means that the biogas and methane content in the gas produced by T1 and T3 were comparable to that of T5. The experimental results further showed that the methane composition of all treatments was in the range of 50% to 70%. This finding further reveals the suitability of the substrate as a supplementary raw material for biogas production from traditional cow dung.
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