NOVELTY - Production of ethanol/butanol and/or an ethanol-butanol mixture and/or biogas in a reactor from fermentable substrate, where the substrate (10) forms a mass stream of solid, liquid and/or gaseous aggregate condition, comprises preparing a gaseous portion of the mass stream before introducing in the reactor by a gas fermenter and/or introducing the mass stream before the biogas production in the base buffer, preferably protonated amino acid.    USE - The method deals with the production of ethanol/butanol and/or an ethanol butanol mixture and/or biogas.    ADVANTAGE - In the method and the device, the ethanol and/or methane can be effectively yielded from any starting materials.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a plant for the production of ethanol-/butanol or ethanol/butanol mixture comprising a reactor for producing ethanol, butanol or ethanol/butanol mixture and/or a reactor for manufacturing fermentation gas, at least one substrate supply unit for forming a mass flow from a fermentable substrate (10), where the substrate exhibits a solid, liquid and/or gaseous aggregate condition, a gas fermenter arranged downstream to the reactor, where the gaseous portion of the mass flow is present, and/or an electrolysis device, with which protonated ions are supplied to the mass flow; and    (2) a reactor for the execution of the above procedure, comprising a closed reactor vessel (11.1), in which a substrate inlet, an ethanol/butanol or ethanol/butanol mixture gas outlet and a discharge substrate outlet as well as a mixing device (11.21) arranged in a fermenting room or limiting a fermenting room, are intended, over which the substrate from the substrate inlet is passed out to the discharge substrate outlet, and a fermenting auxiliary material area taken up with a fermenting auxiliary materials (11.5) and a carrier liquid, which is separate from the fermenting room over a membrane, which is permeable for the fermenting auxiliary materials.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of a plant for the production of alcohol and methanol.    Substrate (10)    Reactor vessel (11.1)    Revolving screen (11.2)    Fermenting auxiliary material (11.5)    Mixing device. (11.21)