Main technologies available for biogas purification.

This study aims to investigate, gather and clearly explain the main methods used to clean and purify biogas, with the removal of compounds such as hydrogen sulfide, carbon dioxide and water, highlighting the techniques which present higher efficiency in the treatment of gas, increasing the calorific value of biogas, thus avoiding corrosion and damage to metal parts and making this gas with characteristics closest as possible to natural gas. Through this information, it is possible to conclude that there are several technologies in development based on the main techniques which are already widespread for the natural gas, aiming a better harnessing of biogas, in a way that it can be appropriately used without restriction in the energy matrix. However, further research should be conducted aiming to reconcile the efficiency factor with the cost-benefit of these purification processes.