METHODS OF BIOGAS PURIFICATION – A REVIEW

Biogas is a product of anaerobic ferment of organic products. Among the fuels from vegetal biomass, biogas has a great importance and can successfully replace fossil fuels for obtaining electricity and heat; the use of biogas exists for a few years also in the field of transport. Biogas formed in the methane fermentation process contains about 50c60% of methane. Other ingredients such as carbon dioxide, hydrogen sulfide, water, water vapour and small amounts of nitrogen and oxygen are compounds that lower the energy value of biogas. In this paper are presented the main methods of biogas purification.