TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: A rotating element rotatable around a vertical axis of rotation is provided. The rotating element extends itself from the upper side of the composting device to the central chamber. The upper end of the rotating element is provided with a control element. The rotatable cover B is present in the central chamber for closing the compost transfer opening arranged in the lower intermediate base. The rotating element carries at least two diametrically projecting covers associated with the compost transfer opening arranged in the upper intermediate base. At least one scarper movable over the lower intermediate base is present in the central chamber. At least one leveling element movable through the central chamber is present in central chamber. The rotating element carries the scarper movable in such a manner to extract the compost over the upper intermediate base. The upper chamber carries the cover to close the compost transfer opening arranged in the upper intermediate base. The upper intermediate base and compost transfer opening of the upper intermediate base, rotatable cover and the segment of the composting device coating, bounding the upper chamber are free from ventilation openings, during which the central chamber and the segment of the composting device coating bounding the lower chamber and the lower intermediate base and the compost transfer opening of the lower intermediate base, rotatable cover are provided with ventilation openings. The composting device possesses a downward extending coating. The volume of the upper chamber is less than the volume of the central chamber and the volume of the central chamber is less than the volume of the lower chamber. The volume of the central chamber is three times greater than the volume of the upper chamber. The volume of the lower chamber is two times greater than the volume of the central chamber. The lower chamber has downward opening. A composting device segment containing the upper chamber, a composting device segment containing the central chamber and a composting device segment containing the lower chamber are provided. The central composting device section in the lower composting device segment and the upper composting device segment in the central composting device segment are useful for the transportation purposes.