Evaluation of the energy potential of biogas produced from the anaerobic co-digestion of animal and poultry dung

In this study, the anaerobic digestion of a substrate that was made from the mixture of cow, turkey, and pig dung, with a mixing ratio of 1: 2:3 was investigated. The mixing ratio of the substrate to water is 1:5 by mass. The digester used is a drum of about 250 liters. The physicochemical properties of the substrate were determined. The pH range of the substrate is 7.6 to 8.1, with cow dung (CD) having the highest, followed by turkey dropping (TD), and pig dung (PD) as the lowest. The carbon-oxygen demand (COD) ranges from 1225 to 1326, the PD has the highest, followed by the CD, and TD is the lowest. The total carbon range is from 375 to 411. PD has the highest followed by CD. The range of Total solid (TS %) is from 11.6 to 13.9, PD has the highest followed by CD. Volatile solid (VS) ranges from 79.6 to 81.2 with CD the highest followed by TD. For Fixed solid (FS), PD has 20.4 followed by TD with 20.0. For the carbon-nitrogen (C/N) ratio, the CD has 20.0 as the highest followed by PD, 13.5. About 80 kg of the substrate was fermented for eight days. The maximum biogas collected is 23.84 g/day after eight days of fermentation to produce the heat energy of 0.364 kWh. The energy potential (0.364 kWh,) is equivalent to 70 g of dry wood, and 0.04 liters of petrol.