NOVELTY - An aerobic composting station (1) for organic waste has chambers (3, 4), connected by a closable opening (5). Compressed air is blown through the first chamber (3) to cause aerobic fermentation, and the second (maturation) chamber (4) has closable fresh air inlets (8). An air suction device (11) (connected to an air treatment unit (12)) in each chamber depressurizes the chamber and closes the connecting opening (5) to prevent escape of untreated air.    USE - For composting organic waste (e.g. dung or liquid manure solids) by aerobic fermentation, especially to produce a fertilizer or organic soil amendment (claimed).    ADVANTAGE - Large volumes of waste can be treated to give a homogeneous, high quality product, while completely eliminating malodour problems.    DETAILED DESCRIPTION - A station (1) for aerobically composting organic waste has at least two chambers (3, 4), connected by a closable (but normally open) opening (5). The first (waste storage and fermentation) chamber (3) has a closable waste inlet (6) and a system (9, 10) for blowing compressed air through the waste to cause aerobic fermentation. The second (waste maturation) chamber (4) has a closable treated waste outlet (6) and closable fresh air inlets (8), for replacing the contaminated air. An air suction device (11) is located in each chamber (the extracted air being piped to an air treatment unit (12)), depressurizes the chamber and cooperates with the waste inlet opening system to close the connecting opening (5) to prevent any untreated air from escaping from the station.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic diagram of a composting station.    Composting station (1)    Chambers (3, 4)    First (storage)compartment (3-1)    Second (aerobic fermentation) compartment (3-2)    Closable connecting opening (5)    Inlet opening (6)    Waste evacuation opening (7)    Fresh air inlets (8)    Air compressor (9)    Compressed air conduits (10)    Air intake (11)    Air treatment unit (12)    Air scrubbing units (13, 14)    Biofiltration unit (15)    Waste supply hopper (16)