TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Method: The biogas is produced on an industrial scale from liquid, pasty or solid biomass, which is treated in the tubular reactor at optimal thermal step (mesophilic (30-42 degrees C), thermophilic (48-55 degrees C) or super thermophilic up to biological level) according to their type. The biomass is optionally heated, crushed and/or prepared with the acidification agent during transport through the water bath of the hydraulic closure by a pipe screw conveyor with a perforated housing. A hot water system maintains the water level of the water in the hydraulic closure according to the principle of communicating vessels at predefined level. The solid biomass is dewatered in an outlet nozzle of the tubular screw conveyor with perforated housing under the pressure from a screw shaft and/or under generated pressure from a throttle device, which is attached at the outlet nozzle. A treatment component for the fermentation material is metered into the tubular reactor through many connection points integrated to the tubular reactor. The composition and the intensity of the treatment components metered into the tubular reactor is adjusted with respect to the type of biomass (liquid or solid) and the type of anaerobic bacteria of the respective fermentation phases (hydrolysis, acid formation, acetic acid formation or methane formation). The maximum level of the water in an expansion container is determined through the adjustable position of the overflow from the expansion container into an outlet tube. The fermentation of liquid biomass is carried out in the tubular reactor without involving the hot water system. The hydrolyzing substrate, which is removed from the area of the phase strongly developed in the tubular reactor, is used for the acidification of the biomass during its supply to the tubular reactor. The self-infection of the fermentation material is carried out within the tubular reactor by the reverse transported fermentation material to process direction using the spiral slide. The sedimentary water from the solid fermentation material jammed at the cross elements in the tubular reactor are used as a local percolate. The sediments from a trough at the bottom of the hydraulic closure are pressed directly into the charging chamber of the tubular reactor using a cleaning screw shaft through the output port on the tube trough. The charging is carried out with fermentation residues of a funnel, which is not immersed in the fermentation residues in the evacuation sheath, by means of a dipper. The ventilation shafts are coupled with a blower, and the blower is connected with a suction chamber of the depositing device via a suction port. The retainer grids for the local heating of the fermentation material in the tubular reactor are separately controlled with valves from the outside of the tubular reactor. The retainer grid is led for stabilization and reduction of the driving torque. The retainer grid form coaxial cylindrical retainer with heating tubes and retainer grid beams for the propagation of the solid fermentation material in the rotating tubular reactor (the center of gravity of the rotating tubular reactor is fed to the rotation axis). The winding direction of the spiral slides is equal to the rotational direction of the tubular reactor. The inlets of the spiral slides are smaller compared to the outlets and the intermediate sliding tracks for preventing blockage with the fermentation material. The tubular reactor for the fermentation material treatment of the respective fermentation phases is provided with many connection points for metering the treatment components. A container with treatment component is attached at the connection points for the fermentation material treatment at the tubular reactor. The funnel of the discharge conveyor is placed in fermentation residues within a removal chamber, which to be constantly filled with the fermentation residues. The dipper is provided for filling the funnel in rotating tubular reactor when the funnel is not immersed in the fermentation material. The discharge conveyor of the evacuation sheath, which is provided with higher outlet nozzle than the maximum fermentation material level in the tubular reactor, is sealed with fermentation residues. The discharge conveyor of the evacuation sheath is sealed with water in the absence of fermentation residues.