NOVELTY - A rotary drum (3) is positioned inside a rotary treatment tank (2). A drive unit (16) rotates the drum and a driving shaft (13) of a cutter. An organic-waste injection chute (9) and a discharge portion (10) are arranged in front and rear ends of the respective end plates (4,5). The organic waste of preset amount and Actinomyces are supplied into the tank. The tank is rotated at a speed of 0.1-10 RPM.    USE - The apparatus is used for processing organic waste such as organic refuse.    ADVANTAGE - Enables uniform stirring of organic waste, by rotating the drum at specific rotational speed and thereby efficient fermentation of the organic waste using microorganisms. Enables easy ejection of composting treated substance.    DETAILED DESCRIPTION - The end plates close the openings at the ends of the rotary drum. Several cutter blades (14) are attached to the driving shaft of the cutter. The driving shaft is rotated during rotation of the treatment tank. A heater (22) heats the air in the space between a storage chamber (1) and the treatment tank.    An INDEPENDENT CLAIM is also included for rotary treatment tank which has a ring is fixed to the inner wall surface at the ends of the rotary drum. A collar-like contact plate is arranged in the inner surface at the peripheral edge of the end plates. An inner pressure plate is arranged in the inner surface of the contact plate and is formed of diameter more than the diameter of the outer diameter of the drum. The inner pressure plate is integrated with an outer pressure plate which is arranged in the outer surface of the contact plate. The inner and outer pressure plates are made of steel and contact plate is made of synthetic resin.    DESCRIPTION OF DRAWING(S) - The figure shows the front view of the composting apparatus.    Storage chamber (1)    Treatment tank (2)    Rotary drum (3)    End plates (4, 5)    Organic-waste injection chute (9)    Discharge portion (10)    Driving shaft (13)    Cutter blade (14)    Drive unit (16)    Heater (22)