Recent Trends in Biogas Upgrading Technologies for Biomethane Production

Biogas, an ultimate renewable energy, is of enormous demand currently, due to increased fuel price and its fluctuations with expansive pollution emission. Biogas is environmentally feasible and viable. Biomethane production is of high impact, and hence the present chapter is concentrated on various biogas upgradation technologies conjugated with carbon dioxide and hydrogen sulphide removal strategies. The upgrading methods such as absorption, adsorption, membrane separation, biological methods, cryogenic technology, hybrid methods, supersonic separation, industrial lung, in situ methane enrichment and chemical dehydrogenation are discussed. High methane purity with minimized methane loss is the key for an effective upgradation method. A comprehensive study of comparison between various biogas upgradation technologies is analysed, showcasing the advantages and disadvantages too. It is concluded that the recently innovated technologies have wide potential advantages than the conventional biogas upgrading technologies. Although innovated technologies are so far better, detailed analysis, research and development is required for acquiring a technology which is economically, environmentally, technologically, operationally and socially feasible and acceptable.