Res. Agr. Eng., 2011, 57(3):97-104 | DOI: 10.17221/25/2010-RAE

Ambient temperature kinetic assessment of biogas production from co-digestion of horse and cow dung

M.O.L. Yusuf1, A. Debora1, D.E. Ogheneruona2
1 Department of Civil and Environmental Engineering, University of Port Harcourt, Port Harcourt, Rivers State, Nigeria
2 Department of Mechanical Engineering, University of Port Harcourt, Port Harcourt, Rivers State, Nigeria

Biogas production from 5 batch digesters containing varying ratio of mix of horse and cow dung was studied for a period of 30 days at ambient temperature. It was observed that biogas production was optimized when horse and cow dung were mixed in a ratio of 3:1. The modified Gompertz equation was used to adequately describe the cumulative biogas production from these digesters. In addition, a modified first order model was developed to assess the kinetics of the biodegradation process. It was observed that the rates of substrate biodegradability and of removal of the biodegradable fractions of the substrate could be obtained by plotting 1/t (ln(dyt/dt)) against the inverse of time of digestion. This modified first order model also showed that the digester containing horse dung and cow dung in the ratio of 3:1 had the highest short term anaerobic biodegradability index (STABI) of 3.96 at room temperature.

Keywords: cow dung; horse dung; anaerobic; modified Gomperzt; biodegradability; kinetics

Published: September 30, 2011  Show citation

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Yusuf MOL, Debora A, Ogheneruona DE. Ambient temperature kinetic assessment of biogas production from co-digestion of horse and cow dung. Res. Agr. Eng.. 2011;57(3):97-104. doi: 10.17221/25/2010-RAE.
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