Effect of inoculum to substrate ratio on biogas production of sheep paunch manure

https://doi.org/10.17221/30/2014-RAECitation:Lawal A.A., Dzivama A.U., Wasinda M.K. (2016): Effect of inoculum to substrate ratio on biogas production of sheep paunch manure. Res. Agr. Eng., 62: 8-14.
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Sheep paunch manure was anaerobically digested to study the effect of inoculum to substrate ratio on biogas production rates and accumulation. Inoculum to substrate ratios of 1.37, 2.05 and 4.1 were digested in biodigesters labelled R1, R2 and
R3 respectively. Results showed that inoculum to substrate ratio had a significant effect on biogas production rates and accumulation. Biogas production rates increased to peak in the order of R3 (0.30526 Nm3/kg volatile solids (VS) days), R2 (0.15308 Nm3/kg VS d) and R1 (0.11009 Nm3/kg VS d) on the 5th day. The biogas production accumulation increased from 0.57195 to 1.46784 Nm3/kg VS as the inoculum to substrate ratio increased. The result of regression showed that coefficient of determination values for the linear equation ranged from 0.707 to 0.797, while the exponential equation had higher values that ranged from 0.7718 to 0.9929 showing better simulation. The modified Gompertz equation showed better simulation of the biogas production accumulation than the first order kinetic equation due to its higher coefficient of determination values.  
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