The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 28, 1984
Filed:
Sep. 10, 1980
Curtis S McDowell, Allentown, PA (US);
Cellu-Craft Inc., New Hyde Park, NY (US);
Abstract
A method and apparatus for continuously separating solids and liquid in a solids-liquid mixture are disclosed. In accordance with the invention, a separation zone for separating solids and liquids from a solids liquid mixture is provided in which the mixture is subjected to centrifugal force under low shear forces and low turbulence. In this zone, the flow rate is maintained to be less than the terminal settling velocity of the solids in the mixture. Further in accordance with the invention, the mixture is introduced into the separation zone from a zone of higher turbulence and higher flow rate than those of the separation zone, a minor part of the mixture in the other zone being removed to the separation zone. The major part of the mixture is removed from the other zone and discharged and returned to the mixture source in such a manner as to aerate the returned mixture. The separated solids are returned to the mixture source with the major part of the mixture. The separated solids and liquid are removed from the apparatus of the invention continuously. The invention is particularly useful in obtaining a highly clarified centrate from sewage sludge.