Two-stage mechanical dewatering of sewage sludge

Details Two-stage mechanical dewatering of sewage sludge Two-stage mechanical dewatering of sewage sludge

1979-07-09

1981-01-13

Camby, John J.

Presses

Methods

With separation from material of liquid expressed

34 12, 34 14, 100 41, A47J 1902, B30B 902

Patent

active

042442877

ABSTRACT:
Sewage sludge is dewatered in a two-stage process. The first stage dewaters the sludge to a solids content above about 40 to 45 wt. %. The first zone comprises a cylindrical porous chamber with a centrally mounted screw conveyor which does not contact the porous wall of the chamber. The second stage further dewaters the sludge. The second stage applies pressure directly, as with a piston, to a stationary quantity of sludge which is in contact with a porous wall. The effectiveness of the second stage is increased through use of the first stage, which reduces the thixotropic nature of the sludge by dewatering it.

REFERENCES:
patent: 4036359 (1937-07-01), Stricklaud, Jr.
patent: 4160732 (1979-07-01), Maffet

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