Robert Ryan Shaffer

US Patent:

39518191, Apr 20, 1976

Filed:

Sep 11, 1974

Appl. No.:

5/505192

Inventors:

Robert L. Shaffer - Olathe KS
Donald G. Mason - Overland Park KS

Assignee:

Ecodyne Corporation - Lincolnshire IL

International Classification:

B01D 1200

US Classification:

210527

Abstract:

A sludge removal system for use in the removal of settled sludge collected on the bottom surface of a circular clarifier. The system includes a plurality of self-supporting sludge receiving conduits of various lengths extending radially outward from the center of the tank in a common horizontal plane. Each conduit has a sludge pick-up port associated with the outer end thereof. Vertical riser tubes extend upward from the inner ends of the conduits into a sightwell assembly. At the upper end of each riser tube is a flow control valve arrangement to regulate the amount of sludge flow through each conduit. The valve indicates a pipe within a pipe, both pipes having slotted openings cut therefrom, to provide a variable flow orifice the size of which may be controlled by rotating the inner pipe about the stationary outer pipe. The upper edges of the slotted openings extend above the static liquid level in the clarifier.