The subject of the present invention is a biological process for the production of mineral nitrogen and / or dihydrogen from atmospheric nitrogen, successively using nitrogen-fixing bacteria and bacteria of the genus Nitrosomonas and / or of the genus Nitrobacter. The present invention also relates to a device suitable for implementing this process and comprising at least three successive compartments. The present invention particularly relates to a device comprising a bioreactor (1), said bioreactor comprising a fermentation tank (24) comprising at least three successive compartments (3, 4, 5). The present invention also relates to the use of nitrogen-fixing bacteria and / or bacteria of the genus Nitrosomonas and / or of the genus Nitrobacter for the production of mineral nitrogen and / or dihydrogen.
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