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Improving Biogas Volume Production Through Carbon to Nitrogen Ratio Modification of Cow Dung

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Document pages: 8 pages

Abstract: This work was performed to study the effect of C N ratio on biogas volume production. The raw material used was cow dung while glucose and ammonium sulfate was used to modify the C N ratio. An isolated six-liter container was used to run the anaerobic process where the temperature was kept in a range of mesophilic condition. The container pressure and temperature were investigated daily. In order to boost the biogas volume production, 10 by volume of effective microorganism-4 (EM-4) was added to the substrate (a mixture of cow dung and water with ratio of 1:1). To investigate the effect of C N ratio of substrate on biogas volume, four different ratios were employed of 15, 22, 27, and 35 respectively. The C N ratio of the raw material is 22.71.The work showed that the biogas volume increased when C N ratio of the substrate was high. In the case of C N ratio of 35, the highest biogas volume was achieved in day 16-18th then the volume decreased gradually. However, the highest volume was achieved in different day for each ratio. For instance in the second best in biogas production, C N ratio of 27, the highest volume was achieved in day 13-15th and even it was achieved in early day for lower C N ratios. The results give indication that increasing the C N ratio of cow dung can improve the quantity of biogas.

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