ANAEROBIC DIGESTER

An anaerobic digester is a system that takes an organic waste stream and through the process of anaerobic digestion (meaning without oxygen), microorganisms break-down the waste stream which generates biogas in the process. The biogas cannot be used due to the large amount of impurities it contains, so the biogas must cleaned through a biogas to biomethane process after which, the clean biomethane, often referred to as "renewable natural gas" is used just as natural gas, methane or CH4... The same types of anaerobic bacteria that produce natural gas also produce biomethane today. Anaerobic bacteria are some of the oldest forms of life on earth. They evolved before the photosynthesis of green plants released large quantities of oxygen into the atmosphere. Anaerobic bacteria break down or "digest" organic material in the absence of oxygen and produce "Biomethane" as a waste product. (Aerobic decomposition, or composting, requires large amounts of oxygen and produces heat.)... Anaerobic..