TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The fermenter contains a solid material support shaft for the entry of solid biomass, which is located as a rectangular, straightly extending shaft attached to the fermenter wall, so that the opening facing the fermenter lies below the liquid level (immersed) and the opposite or outer opening lies above the liquid level, where the shaft is further designed in such a manner that the solid material is transported with a wheel loader, into the fermenter. The shaft is horizontally inclined at an angle of 10-45 degrees . The shaft has internally movable or fixed barbs, which prevent the reverse flow of solid material. The shaft is non-operatively covered with a flap that is automatically opened. An operating rod is guided though a flexible sleeve for moving the nozzle from the outside of the fermenter. The nozzles have a nozzle opening with a diameter of 40-100 mm. The nozzles have an adjustable nozzle opening. The movement of the nozzle takes place with an electric or hydraulic stimulus. The pump is pressure and/or volume variable. The openings for the discharges of biogas and/or the piping systems are located in the fermenter. The fermenter is operated as foil ground basin (1). The device contains at least one side-mounted concrete wall segment (3), in which the openings for the discharges of biogas, and a portion of the pipe or hose system, are arranged on the nozzle. The fermenter is embodied with at least double-shelled basin sealing and double shelled carrier air roof foil and sealing and double-foil roof substructure (2). The carrier air foil roof is held without a concrete foundation. At least two foils are welded, glued or sewed into a sack. The sack is ballooned for mounting the weather protective foil placed above it. The biogas plant is directly connected to a consumer, in which the biogas is used for thermal and/or electrical energy production.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The nozzle is attached to the vessel wall. The sprinkling takes place with up to 10 controlled movable nozzles. The sprinkling is controlled by adjusting the nozzle position and/or by adjusting the fluid pressure at the nozzle. The jet is positioned horizontally upward at an angle of 1-40 degrees . Vertical and horizontal zones and/or layers are formed in the fermenter content. In the method, no additional mixing or homogenization of biomass by stirring device or other devices for mixing the biomass takes place. A storage zone is formed in the fermenter content during the strong discontinuous biomass addition, and the sprinkling is controlled in such a way that the biomass enters the methanation zone from the storage zone and thus a quasi continuous gas production takes place. The swing angle of the nozzle on both sides is 0-90 degrees . The pressure at the nozzle is adjusted by an adjustable nozzle opening and/or adjusting the pump pressure and/or by adjusting the pump flow rate. The sprinkling is carried out with a bundled jet, full jet or a spray jet. The spraying jet reaches more than 50%, preferably more than 80% of the surface of the fermenter contents. The gas production is controlled by targeted sprinkling. The amount of biogas produced, the hydrogen content in biogas and/or the portion of organic acids in the methanation zone are determined and depending on these data, the sprinkling is stopped. The biomass is introduced in unground form (e.g. whole plants of corn, maize and sweet sorghum) into the fermenter. The biomass is introduced by at least one insertion channel or by a flushing system in the fermenter. The addition of fresh biomass in the fermenter takes place only once a day or at longer intervals. The solid materials are placed in suspension, and will be pumped into the fermenter. All the solid materials in the fermenter are present as a liquid suspension in which solid sedimentation takes place. The sprinkling intensity is reduced before the withdrawal of fermentation residue so that a greater horizontal layered configuration is achieved, thus resulting in a selective retention of solid materials in the fermenter.