Fmc Corporation

Howard L Pentz

John C Lodholz

Thomas W Quimby

Milton R Cannan

R Henry Weed

Robert J Cepil

The instant invention provides a diffuser comprising a rectangular frame with a tope edge and a bottom edge; a base plate attached to said bottom edge at a base plate perimeter and having a gas inlet through which gas can flow; a top plate with an upper surface and an inner surface said top plate attached to said top edge at a top plate perimeter and having an aperture through which gas can flow; a flexible, generally gas-impermeable membrane lying above said top plate and attached to said top edge at a membrane perimeter, said membrane including a central porous portion with a boundary defined by an ellipse.

Flexible membrane diffuser

A raking structure for moving settled solids to a discharge opening in the bottom of a sedimentation tank is disclosed herein. The raking structure consists of a rotatable member and a rake arm pivoted on the rotatable member along an inclined pivot axis with a counterweight connected to the rake arm through cable means so that the torque load required to cause the arm to pivot can be varied. The rake arm may also have means for varying the buoyancy of the rake arm and thereby vary the torque or moment compound required to pivot the rake arm with respect to the rotatable member.

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Lansdale, PA, United States of America

Howard L Pentz