Title: Mechanical dewatering process

Abstract: A process for mechanically dewatering fibrous organic waste 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. The longitudinal support rods of the porous wall are located on the inner surface of the porous wall and protrude into the fibrous material.

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Inventors: Maffet, Vere (West Chester, PA, US)

Application Number: 022914
Filing Date: 1979-03-22
Publication_date: 1980-07-29
Assignee: UOP Inc. (Des Plaines, IL)
Primary Class(es): 210/767 34/380, 100/117, 100/145, 210/806
Other Classes:
US Patent Ref:

1772262	Aug, 1930	Naugle	100/111.
3695173	Oct, 1972	Cox	100/74.
3938434	Feb, 1976	Cox	100/117.
4041854	Aug, 1977	Cox	100/112.
4160732	Jul, 1979	Maffet	210/75.

Other Refs:
Primary Examiner: Camby, John J.
Assistant Examiner:
Attorney: Spears, Jr.; John F., Page, II; William H., Hoatson, Jr.; James R.