Today the energy dilemma is one of the most serious problems of the world, particularly in the developing countries. The idea of using renewable and local energy sources is a new solution suggested to get rid of the dilemma. Therefore, this study aims to examine the effect of loading rate, temperature, stirrer, both single and co-digestion of feedstock on biogas function and energy efficiency ratio. In this study we used an industrial scale anaerobic digester (capacity: 925 lit.) with the retention time of 12 days. Tests were performed in 24 various treatments. Results gained from feeding the digester with the cow dung in 35°C through different loading rates with and without stirrer showed that the highest rate of biogas was developed in loading rate of 1/4 along with a stirrer. Likewise, results gained from various feeding processes with the loading rate of 1/4 showed that the highest biogas amount produced by treatment I2 (36-40°C, with the stirrer), with about 950 lit/day, and the most efficient energy rate was developed through treatment J2 (36-40°C, with the stirrer), with about 3.9 MJ. Feeding the digester with both cow dungs and poultry droppings (ratio: 1:2) in the mesophyll temperature using a stirrer with the loading rate of 1/4 is the best mode for producing biogas in terms of both energy efficiency ratio and a sustainable biogas production record.
Primary Language | English |
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Journal Section | Articles |
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Publication Date | June 1, 2014 |
Published in Issue | Year 2014 Volume: 4 Issue: 2 |