Device (20, 40) for the decarbonization of biogas, characterized in that it comprises: - a first tank (205, 510), for holding a volume of liquid comprising lime and water, comprising: - a first portion comprising: - an inlet for biogas in the liquid; - an inlet for the liquid; and - an overflow wall for the spillover of the liquid towards a second portion; - the second portion comprising: - a means for collecting calcium carbonate; and - an outlet for the liquid and the decarbonized biogas, configured to release a portion of the liquid when the volume of liquid in the first tank is greater than a predefined maximum retention volume; - a second tank (225, 520), for holding a volume of liquid comprising lime and water, comprising: - an inlet (230, 521) for liquid released by the first tank; - an inlet (220, 521) for decarbonized biogas from the first tank; - an outlet (235, 585) for decarbonized biogas; and - an outlet (240, 522) for the liquid; - a recirculation line (245, 525) for recirculating the liquid output from the second tank towards the first tank; - a means (246, 546) for recirculating the liquid output from the second tank towards the first tank; - a sensor (250, 526) for determining the pH of the liquid; and - a means (255, 560) for supplying lime to the liquid when the pH of the liquid is below a predefined setpoint. - a first tank (205, 510), for holding a volume of liquid comprising lime and water, comprising: - a first portion comprising: - an inlet for biogas in the liquid; - an inlet for the liquid; and - an overflow wall for the spillover of the liquid towards a second portion; - the second portion comprising: - a means for collecting calcium carbonate; and - an outlet for the liquid and the decarbonized biogas, configured to release a portion of the liquid when the volume of liquid in the first tank is greater than a predefined maximum retention volume; - a first portion comprising: - an inlet for biogas in the liquid; - an inlet for the liquid; and - an overflow wall for the spillover of the liquid towards a second portion; - an inlet for biogas in the liquid; - an inlet for the liquid; and - an overflow wall for the spillover of the liquid towards a second portion; - the second portion comprising: - a means for collecting calcium carbonate; and - an outlet for the liquid and the decarbonized biogas, configured to release a portion of the liquid when the volume of liquid in the first tank is greater than a predefined maximum retention volume; - a means for collecting calcium carbonate; and - an outlet for the liquid and the decarbonized biogas, configured to release a portion of the liquid when the volume of liquid in the first tank is greater than a predefined maximum retention volume; - a second tank (225, 520), for holding a volume of liquid comprising lime and water, comprising: - an inlet (230, 521) for liquid released by the first tank; - an inlet (220, 521) for decarbonized biogas from the first tank; - an outlet (235, 585) for decarbonized biogas; and - an outlet (240, 522) for the liquid; - an inlet (230, 521) for liquid released by the first tank; - an inlet (220, 521) for decarbonized biogas from the first tank; - an outlet (235, 585) for decarbonized biogas; and - an outlet (240, 522) for the liquid; - a recirculation line (245, 525) for recirculating the liquid output from the second tank towards the first tank; - a means (246, 546) for recirculating the liquid output from the second tank towards the first tank; - a sensor (250, 526) for determining the pH of the liquid; and - a means (255, 560) for supplying lime to the liquid when the pH of the liquid is below a predefined setpoint.