Biogas is a combustible gas mixture, and its chemical composition depends on the conditions on the production unit. Biogas can be valued thus constituting a renewable energy source. This review article provides a comparative analysis of the main technologies used in the treatment and purification of biogas. Treatment methods, such as H 2 O and H 2 S removal processes from biogas are described. After treatment, biogas can be used directly to produce thermal and electrical energy. Biogas

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... is possible through its purification, obtaining biomethane that can be used as a substitute for natural gas. This review article also highlights the main technologies for biogas purification through CO 2 removal processes. Among the various biofuels, biomethane is a versatile fuel, and is expected to play an essential role in the circular bioeconomy. The advantages and disadvantages associated with each of these biogas treatment and purification technologies are also discussed.