Liquid purification or separation – With means to add treating material – Directly applied to separator
Reexamination Certificate
2007-08-21
2007-08-21
Lithgow, Thomas M. (Department: 1724)
Liquid purification or separation
With means to add treating material
Directly applied to separator
C210S197000, C210S205000, C210S519000, C210S525000
Reexamination Certificate
active
10801383
ABSTRACT:
This application relates to a circular clarifier for separating and removing separable matter, such as suspended solids, from a liquid. The invention may be used, for example, for separating return activated sludge from clarified liquor using a gas flotation process. The clarifier includes a plurality of fluid feed ports for introducing influent into selected treatment cells of the clarifier in a timed sequence, thereby achieving batch flotation of solids or other separable matter in a continuous infeed process. A plurality of spaced-apart, rotating flocculent handling assemblies traverse the treatment cells for sequentially conveying flocculent into spaced-apart, radially extending collection troughs. All of the flocculent handling assemblies may be driven by a single drive means. Each flocculent handling assembly includes a submerged beach and a scraper assembly including a scraper blade which extends upwardly from the beach. The beaches provide a shear plane underneath the surface layer of flocculent. The scraper assembly includes means for lifting the scraper blade in the vicinity of a trough to enable the blade to traverse over the trough and then descend to a position in contact with or proximate to a corresponding beach. Methods of using the clarifier to more efficiently handle return activated sludge or other fragile flocculent are also described. The clarifier may be stand-alone or adapted to retrofit existing circular primary or secondary sedimentation clarifiers.
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Lithgow Thomas M.
Noram Engineering and Constructors Ltd.
Oyen Wiggs Green & Mutala LLP
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