2.1 Experimental design
The study was based on Completely Randomsied Design (CRD) replicated three times. The treatments
(Table 1) include loading three different mix ratios of 3:1:2, 2:2:2 and 1:3:2 of poutry wastes and cow dung respectively diluted with the same amount of water. 225 g of poultry waste and 75 g of cow dung were mixed with 150 mL of water and loaded into Digester A. 150 g of poultry wastes and 150 g of cow dung were mixed with 150 mL of water and loaded into Digester B. Finally, 75 g of poultry wastes and 225 g of cow dung were mixed with 150 mL of water and loaded into Digester C. Each treatment was replicated three times. Nine different digersters of the same design and size were used in the study.