TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Method: The step of introducing the microorganisms is carried by temporarily spraying. Prior to forming, the biomass further dries. The grinding and drying of the biomass takes place in a simultaneous step. Preferred Components: The microorganisms comprise a mixture of lactic acid bacteria and/or yeasts and/or non-purple sulfur bacteria and/or water. The terminals are connected for supplying and discharging process air, to the output or input of an air dryer, where the air dryer upstream with a condenser for cooling and drying of process air and a first heat exchanger for heating the process air is provided where the heat exchanger downstream of the condenser is arranged. The first heat exchanger is operated at a compressor refrigerating machine, where the heat exchanger is in communication with the high temperature side terminal of the compressor to supply refrigerant. The device comprises a cylindrical dryer drum, where a rotor with grippers for moving the biomass is arranged in the interior of the drum, which is connected via a rotary drive for rotating the rotor, thus simultaneously during the operation drying and crushing of the biomass taking place. The rotor is disposed coaxially within the dryer drum, and the grippers distributed with radially extending arms are disposed on longitudinal axis of the drum. The grippers mesh with rotation of the rotor with the inside of the drum mounted rakes. The filling opening is constructed as a cutout in the top-side surface of the dryer drum and/or the opening for removal as a cutout in the lower-side lateral surface. The terminals are formed for supplying and discharging process air respectively at a front side of the dryer drum, so that the dryer drum is traversed axially from process air. The opening is for removal of the dried and ground biomass over a bed with an apparatus for pressing biomass in the form of pieces in combination. EXAMPLE - No suitable example given.