Method for the valorization of gaseous effluents derived from alcohol fermentation comprising the following steps: - alcohol fermentation in a bioreactor producing a fermented matter and a gaseous effluent, said gaseous effluent including carbon dioxide; - extraction of the gaseous effluent from said bioreactor followed by its compression, in order to obtain a compressed gaseous effluent; - production of a suspension of alkaline bicarbonate in a bicarbonate production unit, said bicarbonate production unit being divided into at least two compartments disposed successively in series, said step of production of a suspension of alkaline bicarbonate comprising: - an introduction, at the lower part of the first compartment, of said compressed gaseous effluent, - an introduction into the last compartment of a stock solution comprising an aqueous solution including a dissolved alkaline carbonate, - a circulation in a counter-flow between a gas stream being depleted in carbon dioxide and an aqueous solution being depleted in carbonate ions in said at least two compartments disposed successively in series, and, - a precipitation of alkaline bicarbonate in said first compartment by reaction of dissolved carbon dioxide with carbonate ions in order to obtain a suspension of insoluble alkaline bicarbonate; and, - a recovery of said insoluble alkaline bicarbonate suspension from said first compartment followed by a step of filtration or decantation of said suspension of insoluble alkaline bicarbonate, in order to obtain a wet residue of alkaline bicarbonate and an aqueous phase. - alcohol fermentation in a bioreactor producing a fermented matter and a gaseous effluent, said gaseous effluent including carbon dioxide; - extraction of the gaseous effluent from said bioreactor followed by its compression, in order to obtain a compressed gaseous effluent; - production of a suspension of alkaline bicarbonate in a bicarbonate production unit, said bicarbonate production unit being divided into at least two compartments disposed successively in series, said step of production of a suspension of alkaline bicarbonate comprising: - an introduction, at the lower part of the first compartment, of said compressed gaseous effluent, - an introduction into the last compartment of a stock solution comprising an aqueous solution including a dissolved alkaline carbonate, - a circulation in a counter-flow between a gas stream being depleted in carbon dioxide and an aqueous solution being depleted in carbonate ions in said at least two compartments disposed successively in series, and, - a precipitation of alkaline bicarbonate in said first compartment by reaction of dissolved carbon dioxide with carbonate ions in order to obtain a suspension of insoluble alkaline bicarbonate; and, - an introduction, at the lower part of the first compartment, of said compressed gaseous effluent, - an introduction into the last compartment of a stock solution comprising an aqueous solution including a dissolved alkaline carbonate, - a circulation in a counter-flow between a gas stream being depleted in carbon dioxide and an aqueous solution being depleted in carbonate ions in said at least two compartments disposed successively in series, and, - a precipitation of alkaline bicarbonate in said first compartment by reaction of dissolved carbon dioxide with carbonate ions in order to obtain a suspension of insoluble alkaline bicarbonate; - a recovery of said insoluble alkaline bicarbonate suspension from said first compartment followed by a step of filtration or decantation of said suspension of insoluble alkaline bicarbonate, in order to obtain a wet residue of alkaline bicarbonate and an aqueous phase.