NOVELTY - A treatment tank (1) consists of a stir axis gear wheel, which is fixed at the one end of an axis (12) and connected with a driver. The treatment tank consists of a heating unit whose temperature is controlled by a controlling unit. The treatment tank has a feed pipe through which decomposing medium and water are supplied to the tank.    DETAILED DESCRIPTION - A decomposing apparatus consists of a treatment tank (1) which is divided into a center tank (2) and side tank (3). An organic waste is supplied to the treatment tank through an inlet (5). A waste water filter medium is fixed on a tank wall (6). A liquid interruption seal and a housing seal (9) are placed on both sides of the filter medium and a bearing (10) is placed. A stirring blade (11) is rotated by a stirring axis (12). An overflow pipe (14) and a drainage pipe (13) are installed at the upper and bottom part of the treatment tank. An aeration pipe (16) connected by a air feed pipe (15), is installed in the treatment tank. The upper part of the treatment tank has an exhaust tube. A stir axis gear wheel, is fixed at one end of the axis which is connected with a driver. The driver and the stir axis are rotated by the same driving unit which rotates in both the direction. The treatment tank consists of heating unit whose temperature is controlled by a controlling unit. The treatment tank has a feed pipe through which decomposing medium and water are supplied to the tank.    USE -   For decomposing organic waste and ground water.    ADVANTAGE -   The organic waste and ground water can be processed by the same apparatus. The apparatus is inexpensive.    DESCRIPTION OF DRAWING(S) - The figure shows the front elevation of the apparatus. (1) Treatment tank; (2) Center tank; (3) Side tank; (5) inlet; (6) Tank wall; (9) Housing seal; (10) Bearing; (11) Stirring blade; (12) Stir axis; (13) Drainage pipe; (14) Overflow pipe; (15) Air feed pipe; (16) Aeration pipe; (26) Decomposition promoter supplying apparatus; (27) Hydrolysis crushing disposer.