The waste paper used for this study was collected from a printing press in the University of Nigeria Nsukka while the cow dung was obtained from an abattoir in Nsukka market. The two digesters used are of metal prototype (50L capacity) constructed at the National Center for Energy Research and Development, University of Nigeria, Nsukka (Fig. 1). The study was carried out between January and February 2010 at the same Research Institute. Nsukka is located at (6.9oN, 7.4oE) and 445m above sea level. Other materials used are; Top loading balance (50kg capacity, “Five goats”, model no Z051599), plastic water bath for soaking the paper waste, water trough, graduated transparent plastic bucket for measuring volume of gas production, thermometer (-10 to 110oC), digital pH meter (JENWAY 3510 digital pH meter (Designed and manufactured in the EU by Barloworld Scientific Ltd, Dun mow, Essex CM63LB), hosepipe and biogas burner fabricated locally for checking gas flammability.