NOVELTY - Method for continuous nutrient supply a liquid medium from a desulfurization plant of a biogas device, containing hydrogen sulfide-reducing microorganisms, using a liquid nutrient-rich medium, preferably using fermentation residues from the biogas device, is claimed. The hydrogen sulfide-reducing microorganisms containing liquid medium is led in to a circuit, nutrients and heat from the liquid nutrient-rich medium are introduced into hydrogen sulfide-reducing microorganism containing liquid medium, and are discharged with sulfate enriched liquid medium.    USE - The method is useful for continuous nutrient supply of a liquid medium, preferably a liquid medium from a desulfurization plant of a biogas device, containing hydrogen sulfide-reducing microorganisms.    ADVANTAGE - The device can be operated continuously in the in situ operation of a biogas plant.    DETAILED DESCRIPTION - Method for continuous nutrient supply of a liquid medium, preferably a liquid medium from a desulfurization plant of a biogas device, containing hydrogen sulfide-reducing microorganisms, using liquid nutrient-rich medium, preferably using fermentation residues from the biogas device, is claimed. The hydrogen sulfide-reducing microorganisms containing liquid medium is led in to a circuit, nutrients and heat from the liquid nutrient-rich medium are introduced into hydrogen sulfide-reducing microorganism containing liquid medium, and are discharged with sulfate enriched liquid medium. A device is used, which consists of at least two chambers spatially separated from each other, where one or more chambers for the entry of the nutrient-rich medium, preferably for fermenting residues of a biogas device, are provided, and at least another chamber for the entry hydrogen sulfide-reducing microorganism containing liquid medium, preferably for the entry of process liquid from a desulfurization plant, is provided. The chamber(s) is realized by a separating device permeable for liquid material flow, which exhibits rigidly or movably arranged membranes or rigidly or movably arranged membrane modules. The membranes or membrane modules allow a flow through of both mediums separated from each other and so a material and a heat exchange between both mediums can be realized. Inlets and outlets of the chambers comprise liquid valves, which allow a medium supply in such a way that a mutual operation of the chambers takes place. The hydrogen sulfide-reducing microorganisms containing liquid medium is conducted in a circuit and on the other hand, is discharged with sulfate enriched medium. INDEPENDENT CLAIMS are also included for:    (1) a device for continuous nutrient supply of hydrogen sulfide-reducing microorganisms containing the liquid medium; and    (2) a biogas device comprising a biogas fermenter (1), connected with a biological desulfurization plant (3), comprising the device, where the biogas fermenter is connected with at least one chamber to uptake the liquid fermenting residues and the desulfurization plant is connected over a circulation pump, with another chamber (5,1, 23,1) to uptake the hydrogen sulfide-reducing microorganisms containing process liquid and to discharge the process liquid enriched with nutrients into the desulfurization plant.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of a biogas plant.    Biogas fermenter (1)    Desulfurization device (3)    Nutrient supply system (5)    Liquid valves (6)    Gas inlet (19)    Gas outlet (20)