The book gives a comprehensive picture of biogas production, mechanism, technology from dung and different organic wastes, its significance in present energy quest and wide applications in domestic and agro-industrial fields such as for cooking lighting and power generation. In addition, the book emphasises the manifold advantages of waste recycling in terms of production of combustible fuel, enriched manure and environmental protection. The book also covers the design and construction techniques, operation and management of biogas plant, distribution system, utilisation of gas and slurry and biogas appliances and its socio-economic aspects. The mechanical conversion of biogas and status of biogas programme in our country are also included. The book gives very useful information and insight for future R & D programmes in waste recycling."