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Although biogas upgrading is a widely studied topic, only up to 35% of produced raw biogas is upgraded in the world. To open avenues for development research on biogas upgrading, this paper reviews biogas as a component in global renewable energy production and upgrading technologies focusing on electrochemically driven CO2 capture systems. Recent progress in electrochemical CO2 separation including its energy requirement, CO2 recovery rate, and challenges for upscaling are critically explored. Electrochemical CO2 separation systems stand out for achieving the most affordable technology among the upgrading systems with a low net energy requirement of 0.25 kWh\/kg CO2. However, its lower CO2 recovery rate compared to conventional technologies, which leads to high capital expenditure limits the commercialisation of this technology. In the last part of this review, the future perspectives to overcome the challenges associated with electrochemical CO2 capture are discussed.<\/jats:p>","DOI":"10.2166\/wst.2024.394","type":"journal-article","created":{"date-parts":[[2024,12,12]],"date-time":"2024-12-12T13:57:17Z","timestamp":1734011837000},"page":"93-116","update-policy":"https:\/\/doi.org\/10.2166\/iwapcrossmarkpolicypage","source":"Crossref","is-referenced-by-count":17,"title":["A review of biogas upgrading technologies: key emphasis on electrochemical systems"],"prefix":"10.2166","volume":"91","author":[{"given":"Hossein","family":"Mohammadpour","sequence":"first","affiliation":[{"name":"a Engineering & Energy, College of Science Health Engineering and Education, Murdoch University, 6150 Perth, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ka Yu","family":"Cheng","sequence":"additional","affiliation":[{"name":"a Engineering & Energy, College of Science Health Engineering and Education, 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