The invention relates to a rotary drum in which by an aerobic heating of the hygienic status of separated free-flowing solids from the cattle manure is changed so that it can be reused as litter in the cows. DOLLAR A The object of the invention is a high loading of the horizontal for installation in an insulated container lying drum with a degree of filling of 60-70%. DOLLAR A According to the invention, the free-flowing solid to be filled is taken up in a chamber and released only in the region in which no solid surrounds the chamber. DOLLAR A crucial element is a flap of the chamber, which opens and closes only in this area. If solids from outside on her, the opening of the flap is prevented. DOLLAR A In order to allow ventilation in spite of the beyond the axis filling, the supply air is passed in countercurrent through the necessary for the solids discharge annular weir and extracted by a four-armed vent cross and an axially arranged pipe.
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