Biogas
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Biogas is amixture of
CH4 and CO2
Residue from biogas production can be used as
agricultural fertilizer
What country is the world leader in the use of biogas
Sweden
Biomethane is also known as
RNG
How is biomethane produced?
biogas upgrading
What can biomethane be used in
engines as a renewable fuel
Biomethane production sequence:
upgraderes remove CO2 from biogas - biogas is dried and cleand to remove impurities and upgraded to pure biomethane - can be used in peaking stations (a power plant that generates electricity only during times of high demand)
Biomethane feedstock
human waste, sewage, food waste, distillery waste, agricultural products
Biogas before upgrading:
40-50% CO2 & 50-60% CH4
After biogas upgrading:
93-94% CH4
Biogas is formed from the:
anareobic decompostion of organic material
Biogas can be used to
generate elcetricity and heat via combined heat and power gas engine or can be cleaned to produce pure biomethane
Biogas creation is also called:
biomethanization (biologically derived gases produced by metabolic products of groups of microorganisms called archaea and bacteria)
The microorganisms that create biogas feed off of
carbohydrates, fats, proteins
Process by which carbohydrates, fats, and proteins become biogas:
Hydrolysis (sugars and fatty acids) - acidogenesis (carbonic acids, aclhols, hydrogen, cabon dioxide, ammonia) - Acetogenesis (hydrogen, acetic acids, CO2) - methanogenesis (biogas, methane, CO2)
Anaerobic digestion can occur at what two temperatures?
mesophilic and thermophilic (35-45 or 50-60)