Ogouvidé Akpaki^1,, Nitale M’Balikine Krou¹, Nyonuwosro Kwamivi Ségbéaya¹

To meet energy needs, especially in developing countries in a situation of global energy crisis, it is necessary to extend to renewable energies, in this case biogas. One of the ways of producing this renewable energy is the co-digestion of livestock waste. The present study aims to optimize the production of methane from chicken droppings (CD) and pig manure (PM). The collection of substrates was done in a breeding center in the city of Kara. The physico-chemical characteristics of the substrates were determined. Co-digestion tests were carried out with 500 mL digesters. Anaerobic digestion was monitored for a period of 28 days at a laboratory temperature of 27 ± 2°C. Biomethane flammability tests have been carried out. The characterization of the substrates indicates that they are favorable to anaerobic digestion. The results obtained at the end of these studies reveal an average daily production of methane of 41.00 ± 19.28 mL, 25.02 ± 10.97 mL, 66.43 ± 33.43 mL and 72.86 ± 33.52 mL per 100 g of co-substrates respectively for the scenarios 100%PM, 100%CD, 1/3PM+2/3CD and 2/3PM+1/3CD. The methane production potentials of effluents gave high productivities for pig manure compared to chicken manure. The optimal methane production value is observed in the case of Co-digestion (1/3CD + 2/3PM). Then, the methane obtained is flammable from the second week of the cycle.

chicken droppings, pig manure, methane, flammability, co-digestion and renewable energy