NOVELTY - Several stirring bars (23) are fixed to a hollow rotary shaft (21) provided at the center of a fermenter (10). A warm-air supply unit (40) has a blower (41), a pipe (42) and a heater (43) which heats the air flowing in the pipe. The pipe supplies warm air into the shaft from the upper end of the shaft.    USE - For fermenting waste materials such as organic waste, human waste, livestock dung and urine, sludge obtained from agricultural processes, meat-processing waste water, fish-processing waste water, waste water from dairy-products manufacturing plant, meat distribution-center waste water, domestic waste water obtained from apartments and kitchen of hotels, to produce manure.    ADVANTAGE - Enables preventing formation of dew at the upper portion of the fermenter, while efficiently removing the entire moisture content from the waste material using the simple mechanism, by increasing the temperature of the upper portion.    DETAILED DESCRIPTION - Several stirring bars (23) are fixed to a hollow rotary shaft (21) provided at the center of a fermenter (10). A warm-air supply unit (40) has a blower (41), a pipe (42) and a heater (43) which heats the air flowing in the pipe. The pipe supplies warm air into the shaft from the upper end of the shaft. Temperature of upper portion of the fermenter is increased by passing a portion of the pipe into the upper portion.    Each stirring bar has air discharge holes (23a). A portion of the pipe is arranged on the top surface of a top plate (10b) of the fermenter, and a portion of the pipe is passed through the plate and is arranged in contact with the inner wall of the fermenter. A throttle valve provided in the pipe, adjusts the amount of warm air supplied to the upper portion of the fermenter. The heater and the valve are arranged at the outlet side of the air blower. The water vapor produced from the target waste material thrown into the fermenter, is ejected by an exhaust pipe (18).    DESCRIPTION OF DRAWING(S) - The figure shows a side sectional view of the waste-material fermentation apparatus.    fermenter (10)    top plate (10b)    exhaust pipe (18)    shaft (21)    bars (23)    holes (23a)    supply unit (40)    blower (41)    pipe (42)    heater (43)