Fulfilling the increasing energy demand is a global challenge. Municipal Solid Waste (MSW) can be a resource if we can efficiently convert it into renewable energy. MSW can be converted into Bio gas & Bio fertilizer by an environmental friendly, cost effective & safe technology called Anaerobic Digestion. Bio gas is a combustible gas which can be used widely both for domestic & industrial purpose. Bio fertilizer is a bio organic soil enricher which contains high level of nutrients. This book provides a complete account of manufacturing process, technology selection, process control, process economics and safety aspects for establishing a MSW based technology for the production of bio gas to meet the increasing demand of energy all over the world.