NOVELTY - The method comprises stirring fermenting mixture containing water, organic substrate and microorganisms in a container with an agitator (9) that is axially fixed in the container, guiding over an external line (5) in a circular pipe with spray nozzles and then spraying in rotation direction of the agitator over a deflector on a surface (14) of the fermenting mixture in the container. The fermentation mixture is sprayed from the lower third of the container. The spraying nozzle and/or the deflector are adjusted so that the sprayed fermenting mixture allows obliquely on the surface.    USE - Method for the fermentative production of biogas from organic substrates for improved conversion of oils and fats in organic substrates.    ADVANTAGE - The method ensures simple fermentative production of biogas from organic substrates with less consumption of energy, high process stability and less effort by better and rapid spraying of the mixture.    DETAILED DESCRIPTION - The method comprises stirring fermenting mixture containing water, organic substrate and microorganisms in a container with an agitator (9) that is axially fixed in the container, guiding over an external line (5) in a circular pipe with spray nozzles and then spraying in rotation direction of the agitator over a deflector on a surface (14) of the fermenting mixture in the container. The fermentation mixture is sprayed from the lower third of the container. The spraying nozzle and/or the deflector are adjusted so that the sprayed fermenting mixture allows obliquely on the surface of the fermenting mixture in the container. The fermentation is carried out at 40-50 degrees C that lies between mesophilic and thermophilic fermentation area. INDEPENDENT CLAIMS are included for:    (1) a container for the fermentative production of biogas from organic substrates; and    (2) a method for suppression of frothing or for improved conversion of oils and fats in organic substrates during the fermentative production of biogas.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of a container for fermentative production of biogas from organic substrates.    Inlet device (2)    Outlet devices (3, 4)    External line (5)    Agitator (9)    Surface. (14)