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Biogas From Seweris a fuel gas made from sewer and biomass such as food waste, grass and straw, sewer etc. during the anaerobic fermentation process.Biogas contains about 55% - 70% methane (CH4), and some carbon dioxide, some water, some hydrogen some carbon monoxide and some hydrogen sulfide (H2S).The heat value of biogas is 5142 Kcal/m3Conditions needed for biogas production are:1- Strict absence of Oxygen.2- Temperature between 8 – 65 Deg. C. Higher the temperature the more active methane bacteria, and the higher biogas production.3- Neutral or slightly alkaline environment, a pH value between 6.8 and 7.5For a 10 m3 biogas plant to keep a 5 m3/d biogas production, 150 kg cow is needed daily.The liquid from biogas plant can be recycled.Biogas residue is good organic fertilizers.Raw material needed to produce 1 cubic meter biogas:Cow Manure 5.26 kg dry = 30.96 kg freshChicken Manure 4 kg dry = 13.34 kg freshHuman Manure 3.33 kg dry = 16.67 kg fresh Review Digester Presentation, Click Here For more information visit PUXIN website Watch this video for "Do It Yourself https://www.youtube.com/watch?v=IGPEP9EZU3Y