Abstract A sewage treatment system in which liquid sewage, containing solids, is conducted into a first or primary settling tank. Liquid is drawn from an intermediate depth of the first tank and conducted to a reducing tank containing an aerator which is operated on a periodic basis and induces a current pattern into the fluid in the reducing tank. A final or outflow settling tank adjacent the reducing tank includes a wall in common with the reducing tank under which settled solids return to the reducing tank. A floating solids return is also provided between the outflow and reducing tanks, and includes a provision for utilizing the current flow induced into the reducing tank by the aerator to educt floating solids from the outflow settling tank into the reducing tank. The floating solids return has an opening in the reducing tank which faces in the same direction toward which the current, induced by the aerator, flows. The effluent is drawn from an intermediate depth of the outflow settling tank.
A PROCESS FOR RETURNING FLOATING SOLIDS FROM A FIRST PORTION OF A TANK, HAVING THE FLUID THEREIN AND DIVIDED INTO TWO PORTIONS BY PARTITION MEANS, TO THE SECOND PORTION WHEREIN A CURRENT, THE MAJOR PORTION OF WHICH IS IN A DETERMINABLE DIRECTION, IS INDUCED, SAID PROCESS COMPRISING THE STEPS OF PROVIDING CONDUIT MEANS AT THE SURFACE OF THE FLUID, SAID CONDUIT MEANS BEING SUBSTANTIALLY "J-SHAPED" WITH A LONGITUDINAL AXIS AND HAVING A FIRST OPENING AT ONE END EXTENDING TRANSVERSELY OF SAID AXIS AND COMMUNICATING WITH THE SURFACE OF SAID FLUID IN SAID FIRST PORTION OF SAID TANK, A CURVED OR REENTRANT PORTION, AND A SECOND OPENING EXTENDING TRANSVERSELY OF SAID AXIS, NEARER SAID CURVED OR REENTRANT PORTION THAN SAID FIRST OPENING, AND OPENING INTO SAID SECOND PORTION OF SAID TANK AND BEING IN COMMUNICATION WITH THE SURFACE OF THE FLUID THEREIN, DETERMINING THE DIRECTION OF FLOW OF THE MAJOR PORTION OF THE CURRENT IN
Claim 2
Dependent Claim
154 words
A PROCESS FOR RETURNING FLOATING SOLIDS FROM A FIRST PORTION OF A TANK, HAVING THE FLUID THEREIN AND DIVIDED INTO TWO PORTIONS BY PARTITION MEANS, TO THE SECOND PORTION WHEREIN A CURRENT, THE MAJOR PORTION OF WHICH IS IN A DETERMINABLE DIRECTION, IS INDUCED, SAID PROCESS COMPRISING THE STEPS OF PROVIDING CONDUIT MEANS AT THE SURFACE OF THE FLUID, SAID CONDUIT MEANS BEING SUBSTANTIALLY "J-SHAPED" WITH A LONGITUDINAL AXIS AND HAVING A FIRST OPENING AT ONE END EXTENDING TRANSVERSELY OF SAID AXIS AND COMMUNICATING WITH THE SURFACE OF SAID FLUID IN SAID FIRST PORTION OF SAID TANK, A CURVED OR REENTRANT PORTION, AND A SECOND OPENING EXTENDING TRANSVERSELY OF SAID AXIS, NEARER SAID CURVED OR REENTRANT PORTION THAN SAID FIRST OPENING, AND OPENING INTO SAID SECOND PORTION OF SAID TANK AND BEING IN COMMUNICATION WITH THE SURFACE OF THE FLUID THEREIN, DETERMINING THE DIRECTION OF FLOW OF THE MAJOR PORTION OF THE CURRENT IN