The effect of cassava peels mixed with poultry, piggery and cattle wastes in the ratios 1:1, 2:1, 3:1 and 4:1 was investigated using 4 replicates in a 3 × 4 factorial experiment, using a 30 day retention period. 12 Nos., 220 L black-coated, batch type digesters, each of which incorporated a water tank as well as iron sponge and sawdust sealed in a separate cylinder, were used.