NOVELTY - The bio-processing apparatus has a vacuum drier (10) to dry a processed object (2) by vacuum suction process inside a treatment tank (1). Bio-fermentation is carried out inside the treatment tank by releasing air and microbe into it.    USE - The apparatus is useful for manufacturing compost from organic refuse or human waste sludge.    ADVANTAGE - Since the vacuum drying process of processed objects is carried out until suitable moisture content is reached for bio-fermentation, the capital investment cost and maintenance cost are reduced. Operativity is improved, since the vacuum drying and bio-fermentation are carried out in a series manner in one treatment tank. Quality is enhanced and the process is more efficient and is more reliable as the dry fermentation switching system is provided to drive bio-fermentation apparatus immediately after driving vacuum drier. Since the vacuum drying is carried out under low temperature and the microbe is used for bio-fermentation, effective usage of microbe is obtained and fermentation process and vacuum drying is carried out easily.    DETAILED DESCRIPTION - A dry fermentation switching system (30) is provided to carry out stoppage of driving of vacuum drier and to carry out driving of bio-fermentation apparatus. The dry fermentation switching system is activated, and the processed object is dried to a predetermined moisture content of 60% before and after the vacuum drying process. A stirrer (40) is provided to stir the processed object which is installed in the treatment tank from the bottom. A heater (10b) is provided in the vacuum drier for heating the processed object in the treatment tank based on the temperature fluctuation. A weigher (50) supporting a treatment tank is attached to detect the weight fluctuation accompanied by the vacuum drying and fermentation process of the processed object. The weigher measures the total weight of the treatment tank with the processed object. A management control system (60) is provided which manages and controls the driving of the vacuum drier and bio-fermentation apparatus based on weight signal, temperature signal detected by a temperature sensor (61) and a pressure signal. A pressure sensor (62) is provided to detect the pneumatic pressure and is sent as pressure signal.    DESCRIPTION OF DRAWING(S) - The figure shows the side view of bio processing apparatus.    Treatment tank (1)    Processed object (2)    Vacuum drier (10)    Heater (10b)    Bio-fermentation apparatus (20)    Dry fermentation switching system (30)    Stirrer (40)    Weigher (50)    Management control system (60)    Temperature sensor (61)    Pressure sensor (62)