Process for mechanically dewatering sewage sludge

Details Process for mechanically dewatering sewage sludge Process for mechanically dewatering sewage sludge

1979-03-22

1980-12-09

Camby, John J.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

100117, 100145, 210760, 210790, F26B 700

Patent

active

042376181

ABSTRACT:
A process for mechanically dewatering fibrous organic wastes such as sewage sludge. The undewatered waste is passed into the first end of a cylindrical dewatering zone having a porous outer wall. A helical blade rotated within the dewatering zone pressurizes the waste and moves it to the outlet at the second end of the dewatering zone. A filter media comprising a cylindrical substantially unagitated layer of fibrous material derived from the waste is retained within an annular space located between the outer edge of the helical blade and the inner surface of the porous wall. Two or more dewatering zones and mixing zones are used in series to achieve the desired degree of dryness.

REFERENCES:
patent: 1772262 (1930-08-01), Naugle
patent: 3695173 (1972-10-01), Cox
patent: 3875319 (1975-04-01), Seckler et al.
patent: 3938434 (1976-02-01), Cox
patent: 4041854 (1977-08-01), Cox
patent: 4070175 (1978-01-01), Swanson et al.
patent: 4160732 (1979-07-01), Maffet

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