The digesters were constructed in a mechanical work shop along Federal University of Technology, FUTA Junction, Akure, Ondo State, Nigeria. It is a cylindrical shaped metal container with a chamber, outlet pipe, inlet pipe, gas pipe and stand. The back was coated black to provide solar heating. The slurry was poured into the digester through the inlet pipe until it started coming out from the outlet pipe. The inlet, outlet, and gas pipe were closed tightly and the digester was then left to stand vertically for nineteen days for the gas to be generated. With the digester nearly filled up, an anaerobic environment was created, which is a prerequisite for the activity of methanogenic bacteria. The details of the experiment and analysis of biogas production is described in previous works by8-11.