Method and apparatus for dewatering of sludges
AssigneeLucia Baumann-Schilp
InventorAndrzej Rumocki
Life of this patent
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Abstract
In order to considerably reduce expenditures for the dewatering of sludges, particularly from sewage treatment facilities, and thereby perform the step from a sticky, wet solid to a flowable solid granulate practically without the re-admixture of material, it is proposed to employ a solid bowl sludge centrifuge as the dispersing member in a subsequently connected convection dryer for further dewatering of the wet solids particles that are ejected with a dry substance content of approximately 25-35 weight percent. The wet solids particles that are ejected at high speed in the form of a film of particles from the outlet of the solid bowl sludge centrifuge are surrounded by the hot drying gas while still on their trajectory and are pre-dried to a dry substance content of approximately 65 weight percent (FIG. 5).
Claims48
A method of dewatering sludges, particularly sludges from sewage treatment facilities, comprising:
- preliminarily dewatering a sludge by means of a solid bowl centrifuge to yield a wet solid comprised of dispersed particles of wet solids and having a residual water content ranging from about 60 weight percent to about 85 weight percent;
- and
- removing residual water from the wet solid by contacting the wet solid with a drying gas under conditions effective to transform the wet solid into a non-sticky, flowable solid,
- wherein the dispersed particles of wet solids are ejected at high speed from an outlet of the solid bowl centrifuge as a film of particles, and wherein the drying gas flows around the film of dispersed particles of wet solids and pre-dries them on their trajectory.
Dependencies are inferred from the claim text.