Abstract: The invention concerns a device comprising a rotary shaft (2) supported above a layer (C) of material, transversely to the translation direction (A) of the material, and means for turning (3) the material extending at least partly radially relative to the shaft (2) and rotated by said shaft to penetrate into the layer. The device comprises means for cutting (4) the layer (C) of material, radially spaced apart (g) from the rotary shaft (2) and rotated by said shaft, said cutting means (4) being located substantially on a cylindrical surface sharing a common geometrical axis with the rotary shaft, and capable, upon penetration into the layer, of fragmenting the latter, while the turning means causes the fragmented material to be granulated.

Abstract: The invention concerns a device comprising a rotary shaft (2) supported above a layer (C) of material, transversely to the translation direction (A) of the material, and means for turning (3) the material extending at least partly radially relative to the shaft (2) and rotated by said shaft to penetrate into the layer. The device comprises means for cutting (4) the layer (C) of material, radially spaced apart (g) from the rotary shaft (2) and rotated by said shaft, said cutting means (4) being located substantially on a cylindrical surface sharing a common geometrical axis with the rotary shaft, and capable, upon penetration into the layer, of fragmenting the latter, while the turning means causes the fragmented material to be granulated.

Abstract: A device for drying sludge originating in a waste water treatment plant is enclosed in a greenhouse having a floor for receiving a bed of sludge to be dried. The greenhouse employs solar energy. A spreader located in the greenhouse ensures the the sludge is spread over the floor and turned as it progresses along the drying device. Fans are positioned over the spreader to provide for the renewal of air present in said greenhouse. A controller controls start up and shut down of a drying cycle as well as automatic control of all motorized components in response to measurement of the temperature of the surface of the bed of sludge. The controller also takes into account the difference in temperature between the surface of the bed of sludge to be dried and the atmosphere present in the drying plant, equipment in the greenhouse only being started up when this temperature difference reaches a predetermined set point.

Abstract: The invention concerns a device for drying sludge derived from urban or industrial wastewater purifying stations using solar energy, produced in the form of a greenhouse (1) comprising a slab or floor (2) whereon is deposited the bed (3) of sludge to be dried, means (4) being provided for turning over the sludge spread on said floor and driving it forward along the drying device, the latter further comprising ventilators to renew the air contained in said greenhouse. The invention is characterized in that said ventilators (6) are positioned on the means (4) turning over and driving forward the sludge bed.