Biogas formation occurs in different microbiological processes. The decomposition steps are as follows; hydrolysis, acidogenesis, acetogenesis and methanogenesis. In the first stage, the “hydrolysis” phase, water-insoluble complex substances (carbohydrates, albumin, fats, etc.) are converted into simpler water-soluble organic structures (amino acids, sugars, fatty acids, etc.). The hydrolytic bacteria involved release enzymes that biochemically break down the material. In the first stage, the products which are converted to water soluble form are converted to lower molecular weight organic acids, hydrogen and carbon dioxide in “acidogenesis” stage. Products may vary depending on the ambient conditions and the bacteria species present. In the third stage, eto acetogenesis ürün, the products formed in the second stage are converted to simple organic acids such as carbon dioxide (CO2) and hydrogen as well as acetic acid (CH3COOH) by anaerobic oxidation. In the last stage of biogas formation, ano methanogenesis öncelikle primarily acetic acids, hydrogen and carbon dioxide are converted to methane by absolute anaerobic methanogen arcs. Methanogens using hydrogen produce methane from hydrogen and carbon dioxide, while acetoclastic methane formers decompose acetic acid to form methane.