Abstract
This work evaluated the effects of feed/inoculums ratio, temperature and agitation speed on biomethanisation of the mixture of cattle dung, pig dung, and poultry droppings for enhanced biogas/biomethane production. The biomethanisation experiments were carried out in anaerobic digesters at different process variables of feed/inoculums ratio (1:1, 1:2, 1:3, 2:1 and 3:1), temperature (25-60°C), and agitation speed (30-70 rpm). The digesters were incubated for 70 days. The results showed positive influence of feed/inoculum ratio, temperature and agitation speed on cumulative biogas yield, biomethane content and start-up time of biomethanisation. Modified Gompertz and Exponential Rise to Maximum kinetic models showed better correlation of the cumulative biogas production. The estimated values of the thermodynamic properties (Gibbs free energy, enthalpy, entropy change and activation energy) suggested that the biomethanisation process was thermodynamically feasible, spontaneous and endothermic in nature suggesting hydrogenotrophic methanogenesis pathway.
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