(WO9722842-A2)      Drying organic wastes in two drying stages operating in sequence comprises aerating waste in the initial stage and simultaneously de-watering. The air supports aerobic decomposition, producing heat which is used in the second stage, to complete the drying. Also claimed is device to dry the wastes as above.    Preferably, in the first stage, the pre-drying aeration is controlled to leave the waste (now part-composted) with a residual moisture of 28-30 wt%. In the second stage, the waste is dried to a residual moisture of up to 15 wt%.    USE -   The process is used to dry waste for subsequent or immediate incineration.    ADVANTAGE -   The process dries waste without odour so that it may be stored or burned, avoiding unwanted emissions. A minimum of energy is consumed in the process, heating energy being released by the composting of the material itself. The heat pump system accelerates drying in the second stage. The closed chambers and use of a biological filtration treatment for the outgoing air prevent odour emission.    (EP809777-A1)      Drying organic wastes in two drying stages operating in sequence comprises aerating waste in the initial stage and simultaneously de-watering. The air supports aerobic decomposition, producing heat which is used in the second stage, to complete the drying. Also claimed is device to dry the wastes as above.    Preferably, in the first stage, the pre-drying aeration is controlled to leave the waste (now part-composted) with a residual moisture of 28-30 wt%. In the second stage, the waste is dried to a residual moisture of up to 15 wt%.    USE -   The process is used to dry waste for subsequent or immediate incineration.    ADVANTAGE -   The process dries waste without odour so that it may be stored or burned, avoiding unwanted emissions. A minimum of energy is consumed in the process, heating energy being released by the composting of the material itself. The heat pump system accelerates drying in the second stage. The closed chambers and use of a biological filtration treatment for the outgoing air prevent odour emission.    (EP809777-B1)      Drying organic wastes in two drying stages operating in sequence comprises aerating waste in the initial stage and simultaneously de-watering. The air supports aerobic decomposition, producing heat which is used in the second stage, to complete the drying. Also claimed is device to dry the wastes as above.    Preferably, in the first stage, the pre-drying aeration is controlled to leave the waste (now part-composted) with a residual moisture of 28-30 wt%. In the second stage, the waste is dried to a residual moisture of up to 15 wt%.    USE -   The process is used to dry waste for subsequent or immediate incineration.    ADVANTAGE -   The process dries waste without odour so that it may be stored or burned, avoiding unwanted emissions. A minimum of energy is consumed in the process, heating energy being released by the composting of the material itself. The heat pump system accelerates drying in the second stage. The closed chambers and use of a biological filtration treatment for the outgoing air prevent odour emission.