NOVELTY - New fermenter includes a fermenting pit (2) of predetermined width on top of which a stretcher (6) extends from one end to the other in the longitudinal direction. A truck (D) runs in the length direction of the pit on rails (3) through the stretcher guide tubes and performs addition and removal of waste. The truck also rakes the organic substance sediment in the pit. Several parallel screw type cutter-agitators (SE) are provided under the stretcher attached to the truck, and are actuated by a motor (4). The multiple screw type cutter- agitators are vertical and tiltable, centering around the rear side. DETAILED DESCRIPTION - The axle (9) of the truck is arranged over a rectangular base frame (8). The wheels (10) of the truck are attached to the left and right base frames through the axle, and runs on the top of the rails. On the base frame, a pair of pivot shafts (7) are coupled non-rotatably between a pair of frames for support and are arranged in the rear side of truck to the left and right. The multiple screw type cutter-agitators are detachable. A wire wrapped drum (17) is also attached non-rotatably between a pair of support frames at the front part of the base frame. Multiple suspending wires (18) are wound at equal interval around the drum. The lower end of each suspending wire is coupled with the front part side of a screw type cutter-agitator. During the actuation of the motor, the wire wrapped drum rotates and causes the rolling-up or rolling-down of the suspending wire. The multiple screw type cutter-agitators are tilted and rotated with the pivot shaft as fulcrum. The actuation of motors to rotate the screw conveyors is effected by a driving mechanism. On the undersurface of the truck at the rear side a grinding disperser (41) with rotation axis in the cross direction of pit supported by base frame is provided. Several axial churning claws (41b) are arranged in the surrounding space of the grinding disperser. At the end of each screw type cutter-agitator conical-shaped radial vanes (39) are formed. A churning claw is arranged to interpose between the ends of each screw type cutter agitator. During tilting of the rakes the upper edge surface of the anterior plate inserted into pit at each end has rough surfaces (35). The height of the pit wall (1) for the fermenter is 2.5-3 m. Chain type rails in which sprocket type wheels of a truck gears are also provided on top of the pit.    USE -   For fermentation of organic refuse from livestock industry, homes etc.,    ADVANTAGE -   The multiple screw type cutter-agitators enable total raking of the organic material from the pit bottom and the problems arising by usage of chain type cutter-agitators are eliminated. The durability of the apparatus is improved remarkably. Maintenance work is reduced and the apparatus can be used in fermenter pits of variable heights. High temperature zymosis is performed satisfactorily at reduced cost. The smooth and reliable operation of truck is ensured.