eng Science and Education Publishing Chemical Engineering and Science 2328-7373 2015-11-24 3 1 7 11 10.12691/ces-3-1-2 CES2015312 article Surajudeen Abdulsalam surajudeen_abdulsalam@yahoo.com 1 Mustapha Yusuf 2 Department of Chemical Engineering, Abubakar Tafawa Balewa University, Bauchi, PMB 0248, Bauchi, Bauchi State-Nigeria Department of Chemical Engineering, Ahmadu Bello University, Zaria, Kaduna State-Nigeria Kinetic investigations of biogas produced from Cow dung and Elephant dung were carried out. Three samples tagged: 1 (100% Cow dung), 2 (50% Cow dung and 50% Elephant dung) and 3 (100% Elephant dung) were investigated in prototype batch bio-digesters using anaerobic digestion process. In addition, the kinetic studies of the three samples investigated were carried out. Results obtained revealed that Sample '2', the co-digestion of Cow and Elephant dung gave the best cumulative biogas production of 3.92*10-4 g/cm3 and average yield of 0.084 5 over a period of 33 days. The kinetic of the process followed a shifting order (0-1); the kinetic parameters obtained can be used to size bio-digester and also monitor the rate of biogas produced. Therefore, the co-digestion of Elephant and Cow dung in equal proportion can be used to increase yield of biogas. http://pubs.sciepub.com/ces/3/1/2/ces-3-1-2.pdf anaerobic co-digestion yield cumulative concentration prototype batch biogas kinetic