Method and apparatus for continuous dehydration of sludge

Details Method and apparatus for continuous dehydration of sludge Method and apparatus for continuous dehydration of sludge

1999-03-02

2000-12-26

Wilson, Pamela

Drying and gas or vapor contact with solids

Process

With contacting of material treated with solid or liquid agent

34424, 34 71, 34 95, F26B 300

Patent

active

06163980&

ABSTRACT:
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.

REFERENCES:
patent: 2723954 (1955-11-01), Young
patent: 3859734 (1975-01-01), Wahlgren
patent: 3898745 (1975-08-01), Carlsson
patent: 3909410 (1975-09-01), Neukamm
patent: 5522156 (1996-06-01), Ware
WO9606805, Method of drying sludge, PCT/NO95/00143, Mar. 1996.

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