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US 4,913,771 AGranted
Method for dewatering sludge or slurry
OwnerGlover C. McIntyreinventor
Life of this patent
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Abstract
Sludge or slurry is dewatered by passing it on a screw conveyor through a sealed vessel at a vacuum more negative than -10 inches of Hg. As a result, moisture is removed from the sludge or slurry as water vapor. The vessel is sealed from air by the presence of the sludge or slurry at the inlet and outlet port extents of the vessel.
Claims8
Method of removing moisture from sludge or slurry comprising:
- transporting said sludge or slurry through the lower portion of a sealed vessel on a screw conveyor,
- passing said sludge or slurry into and out of said vessel through respective inlet and outlet port extents
- exposing said sludge or slurry on said conveyor to the environment in said sealed vessel
- during said exposure creating a vacuum more negative than -10" Hg. in said environment,
- removing from said environment water vapor resulting from said moisture from said sludge or slurry
- transporting said sludge or slurry on said conveyor so as to effect substantial air sealing at said inlet and outlet port extents,
- wherein the sludge or slurry entering and leaving the inlet and outlet port extents, respectively, has a sufficiently solid constituency to effect such substantial air sealing.
4 more elements
Dependencies are inferred from the claim text.