NOVELTY - A main trunk (7) of a screw conveyor (6) is arranged inside a dehydration zone (12) at an inclined angle. An inner blade (5) and an crushing blade (13) are arranged coaxially relative to each other. A vent sleeve (16) is arranged in predetermined position of the main trunk, outside the dehydration zone for ejecting waste liquid from the dehydration zone.    USE - For removing water from livestock excrement during composting of excrement.    ADVANTAGE - Enables stable ejection of waste liquid from the livestock excrement. The need for auxiliary materials such as saw dust is eliminated and thereby the cost required for mixing apparatus of the auxiliary materials is reduced. The adhesion of the excrements to the inner wall of the hopper is prevented, easing maintenance operation.    DETAILED DESCRIPTION - A hopper (4) has an insertion opening (17) arranged in a pumping zone (9). The raw material is supplied to the pumping zone through the insertion opening. A feeder blade (8A) and the crushing blade are rotated to grind the excrement. A dehydration mechanism (10) has a porous cylindrical pipe (11) of preset length. A protective rib is arranged in the outer surface of an axle portion, for forced rotation of the excrement in the dehydration zone. A circular valve is arranged in the outer surface of a shaft in a top zone (14), such that a predetermined gap is formed between the valve and a barrel in the top zone. A flexible airtight sheet is arranged in the inner wall surface of the hopper to prevent adhesion of the raw material. A filter cloth is arranged in a solid-liquid separation device (24). The water of the waste liquid loaded within a waste-liquid receiver of a top tank, is filtered by the filter cloth.    DESCRIPTION OF DRAWING(S) - The figure shows a sectional view of the water removal device.    hopper (4)    inner blade (5)    screw conveyor (6)    main trunk (7)    feeder blade (8A)    pumping zone (9)    dehydrating mechanism (10)    pipe (11)    dehydrating zone (12)    crushing blade (13)    top zone (14)    vent sleeve (16)    insertion opening (17)    solid-liquid separation device (24)