A review of biogas production methods from wastes and sewage and the explanation of its process

Existence of thousand tons of animal wastes and sullage in urban and rural areas in our country is dangerous for environment and it causes the increase of greenhouse gases. Growing trend of energy consumption also causes crisis of energy shortage in the world and as well consumption of fossil fuels produces pollutant gases. Thus using clean and renewable energy is an important subject in every country now. One of these energies is biogas energy that not using of it increasing the pollution in urban and rural areas. Production of biogas through decomposition of wastes can provide both a part of energy required and solution to household waste dispose and reduction of environment pollutants. This is a narrative study that investigated how to produce biogas, with an overview of the importance and advantage of using biogas in 1998 to 2014. Current study explains how organic materials decompose by anaerobic bacteria. It also illustrates different technology for landfill gas collection system. The biogas application and advantage of industrial using is also evaluated. It is also offered a model for obtain the rate of biogas production base on first order kinetic reaction.