Sewage treatment tank with aeration chamber and settling chamber

Claim 1

A CYLINDRICAL SEWAGE TANK HAVING THEREIN A COAXIAL FRUSTOCONICAL PARTITION DIVIDING THE INTERIOR OF THE TANK INTO A MAJOR CHAMBER BELOW AND IN A MINOR CHAMBER ABOVE, SAID PARTITION BEING SPACED FROM THE TANK WALL TO PROVIDE A NARROW ANNULAR INTAKE PASSAGE FROM THE MAJOR CHAMBER TO THE MINOR CHAMBER, THE BOTTOM OF THE PARTITION FORMING A SUBMERGED WEIR, AN EFFLUENT WEIR IN THE MINOR CHAMBER COAXIAL WITH THE PARTITION, MEANS FOR CAUSING A CONSTANT UPWARD FLOW OF AIR AXIALLY IN THE MAJOR CHAMBER TO CAUSE IT TO BE AN AERATION CHAMBER, A CIRCULAR BAFFLE IN THE MINOR CHAMBER FORMING WITH THE TANK WALL AND ANNULAR QUIESCENT POOL LOCATED DIRECTLY ABOVE THE ANNULAR INTAKE PASSAGE AND SPACED OUTWARDLY FROM THE EFFLUENT WEIR, WHEREBY ALL FLOATING MATERIAL ENTERING THE MINOR CHAMBER WILL PASS DIRECTLY UPWARD INTO SAID QUIESCENT POOL THUS LEAVING THE FLOW INWARDLY OVER THE EFFLUENT WEIR FREE OF FLOATING MATERIAL.