Sewage treatment system

A system for treatment of aqueous raw sewage comprising:

• (a) a centrifugal mill having at least one inlet port through which aqueous raw sewage and air are suppliable to the interior of said mill, said centrifugal mill for subjecting the aqueous raw sewage and air to turbulence and impact forces for aeration of aqueous raw sewage and disintegration of the solids therein, said centrifugal mill having an outlet port, said centrifugal mill comprising,
• a) (I) a housing having a vertically disposed bore formed therethrough and a head plate in which the inlet port of said centrifugal mill is formed and a bottom plate adjacent which the outlet port of said centrifugal mill is formed,
• b) (II) a main shaft vertically disposed in the bore of said housing and rotatably mounted therein,
• c) (III) a first plurality of comminution means each affixed to said main shaft for rotation therewith and axially spaced along the length of said main shaft, each of said first plurality of comminution means disposed in a different plane transverse to the longitudinal axis of said main shaft,
• d) (IV) at least one outboard shaft vertically disposed in the bore of said housing and rotatably mounted therein,
• e) (V) a second plurality of comminution means affixed to said outboard shaft for rotation therewith and axially spaced along the length of said outboard shaft, each of said second plurality of comminution means disposed in a different plane transverse to the longitudinal axis of said outboard shaft,
• f) (VI) drive means coupled to said main shaft and to said outboard shaft for rotatably driving those shafts in opposite directions;
• (b) evacuator means connected to the inlet port of said centrifugal mill and connectable to a source of aqueous raw sewage for extracting the sewage from the source and supplying it to the interior of said centrifugal mill through the inlet port thereof;
• and
• (c) self cleaning screen means connected to the outlet port of said centrifugal mill for separating the disintegrated solids from the aqueous sewage exiting from said centrifugal mill.