NOVELTY - Composting machine comprises a vessel, a waste inlet, a means for shredding the waste, an agitator having a rotatable vertical tubular shaft and wings, air nozzles, a discharge pipe and means for providing a flow of air from the air nozzles through the vessel and the waste in it to the surroundings through an air outlet.    USE - For decomposition of compostable waste.    ADVANTAGE - The machine renders the decay or decomposition of the composed organic waste more efficient. It avoids clodding of the waste in the vessel and accumulation of material adhering to the agitator and maintains and promotes biological decaying process. The emission of annoying odors from the vessel are also avoided or extensively reduced. There is an automatic intermittent discharge of composed material through the discharge pipe, which was not possible conventionally.    DETAILED DESCRIPTION - A composting machine for decomposition of compostable waste comprises a vessel, a waste inlet at the bottom of the vessel, means for shredding waste supplied to the inlet, an agitator in the vessel comprising a rotatable vertical tubular shaft and wings projecting radially from the shaft to agitate and mix the waste supplied to the vessel through the inlet. At least one of the wings is skewed or beveled to lift the waste in the vessel, thus moving the waste from the bottom of the vessel to its top. The machine further comprises air nozzles for the supply of air to the vessel located on the hollow shaft, communicating with its interior to be displaced in a horizontal circular path through waste in the lower region of the vessel by the rotation of the hollow shaft. There is also a discharge pipe for decomposed waste at the top of the vessel and the means for providing a flow of air from the air nozzles. The nozzles are located on the trailing edge of at least one tubular wing forming a manifold for the nozzles, which are distributed along the edge and are directed obliquely towards the bottom of the vessel to open in it close to the bottom. The means for providing the flow of air is adjusted to maintain a negative pressure in the vessel.    DESCRIPTION OF DRAWING(S) - The drawing shows a vertical cross sectional view of a composting machine according to the current invention.    Cylindrical vessel (10)    shaft (16)    Wings (22-27)    Air nozzles (30)    Means for providing the flow of air from the air nozzles through the vessel and the waste in it to the surroundings (30, 63)    Waste inlet (43)    Means for shredding waste supplied to the inlet (56,58)