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AssigneesDHV Milieu en Infrastructuur B.V., Technische Universiteit Delft Faculteit Technische Aardwetenschappen
InventorsEduardus Julius Maria Van Poppel, Peter Carlo Rem
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A method and apparatus is provided for continuous dehydration of sludge wherein, prior to dehydration, water is mechanically removed from the sludge, and the thus obtained sludge of cutting consistency is mixed with heated spheres. Dehydration is carried out at reduced pressure, wherein the sludge from which water has been mechanically removed is intimately mixed with the heated spheres in order to increase the heat capacity of the sludge. The dehydrated sludge and the cooled spheres are then separated from each other, the dehydrated sludge is removed, while the cooled spheres are reheated and subsequently added to fresh sludge that is to be dehydrated. The spheres are partly heated by means of water vapor coming from the sludge and partly by means of steam. The spheres are made from steel, having a diameter of 8-16 mm. The pressure in the system ranges form approx. 2 bars to approx. 0.05 bar. An apparatus is also provided for carrying out the method. The apparatus may be of the screw kind or of the turret kind.
A method for the continuous dehydration of sludge comprising the steps of:
An apparatus for continuous dehydration of sludge wherein, prior to dehydration, water is mechanically removed from the sludge, and the thus obtained sludge of cutting consistency is mixed with heated spheres, comprising a first tube (2) with a screw conveyor (3) and a shaft (4) for intimately mixing and transporting sludge and heated spheres, and a second tube (5) with screw conveyor (6) with shaft (7) for the transport of spheres (8) to be heated, which tubes are interconnected by means of at least one pipe (15), a separation device (9) for separation of the spheres from the dehydrated sludge, a sludge outlet (12), a sludge inlet (10), a water removal belt (11) for the spheres (8), a discharge (13) for the spheres, and an inlet (14) for the spheres to the first tube (2).
An apparatus for continuous dehydration of sludge wherein, prior to dehydration, water is mechanically removed from the sludge, and the thus obtained sludge of cutting consistency is mixed with heated spheres, comprising a drum (21) for mixing sludge which has undergone mechanical water removal with hot spheres (22), a first turret (23) and a counter-revolving second turret (24) having respective compartments (32), a discharge location (25) for the heated spheres, a drum (26) for separation of the dehydrated sludge and the spheres, and an outlet (31) for the dehydrated sludge.
Dependencies are inferred from the claim text.