The high portions of organic and Greasy constituents of the skim of Induced Air Flotation (IAF) unit that is typically land disposed or rendered have made it environmentally problematic for the receiving bodies due to its poor natural solubility and degradability. One solution for that was the use of anaerobic digestion. Five laboratory scale batch reactors (each of 10 L working volume) were used herein to test the effect of different IAF skim to working volume ratios; namely 0.5, 1.5, 2.5, 4.0, 5.0:10 (R1-R5), while the rest of working volume was filled with livestock manure (as inoculums). These reactors were operated at two different temperatures (25C and 45C), to determine the temperature effects on digestion performance. Chemical Oxygen Demand (COD) removal efficiencies of 72.6%, 68.6%, 60.1%, 52.1%, and 43.25% were achieved for R1-R5 respectively, at temperature of 25C. These removal efficiencies were significantly improved at temperature of 45C, where efficiencies of 91.2%, 81.5%, 72.1%, 60.7% and about 50% were achieved for these reactors. In addition, very promising biogas production rates of 4.5- 5.8 l/day were determined at operation temperatures of 45C (compared with 3- 4 l/day at 25C) for the majority reactor life times. This achievement may compensate the treatment costs in addition to the supply of cheap renewable energy.