Liquid surface decanter
OwnerArthur D. Brown, Stephen G. B. Jonesinventors
Life of this patent
Estimating the term…
Abstract
A liquid surface decanter devised particularly for decanting clear liquid from settled effluent contained in a tank and comprising a rotatable suport pipe protruding through a side wall of a tank and a header pipe arranged parallel to the support pipe and connected thereto by a number of downcomer pipes. The header pipe is provided with longitudinal weir slots and is supported on the surface of the liquid by a buoyancy float. The level of the liquid relative to the weir slots is adjusted by the buoyancy float until liquid flows into the weir slots down the downcomer pipes and out through the support pipe at a predetermined rate causing the header pipe to fall within the tank and rotate about the axis of the support pipe.
Claims9
A liquid surface decanter comprising a rotatable support pipe adapted to be placed below the surface of the liquid to be decanted in a substantially horizontal disposition, one or more downcomer pipes rigidly attached to, radially extending from and communicating with the interior of said support pipe, a header conduit rigidly attached to and communicating with said downcomer pipes at the opposite end thereof from said support pipe, said header conduit being orientated substantially parallel with said support pipe, a buoyancy float arranged to support said header conduit on said liquid surface, and one or more weir slots longitudinally oriented in said header conduit and laterally displaced therein so that when said header conduit is supported on the surface of said liquid by said buoyancy float said liquid flows through said slots into said header conduit and hence down said downcomer pipes to said support pipe to be discharged therefrom, said weir slots incorporating opposed leading and trailing edges arranged so that liquid flows firstly over said trailing and then over said leading edge as said header conduit is lowered relative to said support pipe by rotation thereabout, and wherein said leading and trailing edges subtend a predetermined angle at the axis of said header conduit.
Dependencies are inferred from the claim text.