Investigation yield and energy balances for biogas production from cow and poultry manure

Abstract

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.

Keywords

• Anaerobic digester, Biogas, Energy efficiency, loading rates

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