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Gases which are made up of anaerobic digestion through agricultural and animal waste known as biogas. When the biomass is decomposed in the absence of oxygen, it releases biogas. The bio-gas plant produces gas from the raw materials, then through the slurry that gas enters the plant and it goes to digester. An air packed compartment is there which is made up of bricks where microbes do anaerobic respiration which reales methane and other gases as well. The last step is that these gases come out through the pipe and the left over are used as the fertilizer.