Background and purpose: Biogas is a clean and renewable energy that can be a good alternative to the conventional sources of energy. The purpose of this study is to produce biogas from kitchen waste and sheep manure in laboratory scale. Methods: In this study, biogas pr
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Background and purpose: Biogas is a clean and renewable energy that can be a good alternative to the conventional sources of energy. The purpose of this study is to produce biogas from kitchen waste and sheep manure in laboratory scale. Methods: In this study, biogas production from kitchen waste was investigated. Anaerobic digestion experiments were performed using one-liter bottles as reactor at the room temperature. The effects of the waste weathering, sheep manure, concentration of solid waste, sheep manure percentage and the time of the preparation of bacterial environment in biogas production efficiency and methane percentage in biogas was investigated. Results: Experimental results showed that kitchen wastes which are not affected by aerobic fermentation can be fermented to methane gas in anaerobic digestion. Also, the addition of sheep manure as a supplier source of anaerobic bacteria increases significantly biogas production. In this case, the mean value of biogas produced was measured about 14/65 ml/(g of dry solid) and 16/25 ml/ (g of dry kitchen waste). In addition, it was concluded, if methanogen source is prepared during about 16-20 days, the biogas production process would be completed in about 24 hours and biogas consists mainly of methane. Discussion and conclusions: Final obtained results from anaerobic digestion of kitchen waste in the presence of methanogen showed that, if the concentration of methanogen bacteria is quite enough before adding to the waste and organic acids production from the first stage of digestion, produced acids are converted to biogas (methane) upon formation and produced gas is mainly methane.
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