On the other hand,unmanaged organic fractions from farming, industry and municipalities decompose in the environment,
resulting inlarge-scale contamination of land,water and air. Recent legislation in the United States and European countries
are forcing member countries to reduce the amount of biodegrad-able organic waste entering landfills. Anaerobic digestion is a suitable technology to treat the solid waste and waste water and it has been considered as a waste to energy technology.The production of biogas through anaerobic digestion offers significant advantages over other forms bioenergy production.It has been evaluated as one of the most energy-efficient and environmentally beneficial technology for bioenergy production.Limitationof carbon dioxide and other emission through emission regulations, carbon taxes and subsidies on biomass energy is making anaerobic digestion a more attractive and competitive technology for waste
management [40].