Apparatus for treating sewage

Claim 2

A waste water treatment apparatus comprising a treatment tank adapted to receive waste water to be treated, said tank being of circular horizontal cross section and including two concentric annular sections, movable biological contactor means mounted in said tank in completely submerged position and movable into contact with said waste water for biological treatment of said waste water, said biological contactor means being positioned in one of said annular sections, the other of said annular sections being adapted to serve as a clarifying means, aeration means adapted to act upon the waste water in said one section to provide dissolved oxygen to said waste water, and means for conducting waste water which has been biologically treated in said one section to said other section for clarification.

Claim 3

A waste water treatment apparatus as defined in claim 1 in which said aeration means comprises a second shaft mounted to extend radially in said one section, and partially submerged disk means mounted on said second shaft for rotation therewith.

Claim 4

A waste water treatment apparatus as defined in claim 1 in which said biological contactor means comprises a first shaft mounted to extend radially in said one section, and disk means mounted on said first shaft for rotation therewith.

Claim 5

A waste water treatment apparatus as defined in claim 1 including at least two radially extending first shafts mounted contiguous each other in radially diverging relation to each other, each shaft having mounted thereon for rotation therewith a group of larger diameter disks lying on a radially outer portion of the respective shaft and a group of smaller diameter disks lying on a radially inner portion of the respective shaft.

Claim 6

A waste water treatment apparatus as defined in claim 1 including inclined surface settler means positioned in said other section in the path of waste water flow through said other section.

Claim 7

A waste water treatment apparatus comprising a treatment tank adapted to receive waste water to be treated, biological contactor means mounted for rotation in said tank in a completely submerged position and movable into contact with said waste water for biological treatment of said waste water, said biological contactor means comprising a series of submerged rotating biological contactor assemblies having relatively closely spaced vertical surfaces and disposed along the length of said tank; aeration means adapted to act upon the waste water in said tank to provide dissolved oxygen to said waste water, said aeration means operating at the surface of the waste water in said tank; and baffle means adapted to direct waste water which has been aerated by said aeration means into contact with said submerged assemblies, said baffle means directing waste water in a serpentine path between said aeration means and said submerged assemblies, and said assemblies providing surfaces for attachment and growth of a biomass of microorganisms with the dissolved oxygen provided by said aeration means maintaining aerobic biological activity of said biomass.

Claim 8

A waste water treatment apparatus comprising a treatment tank adapted to receive waste water to be treated, biological contactor means mounted for rotation in said tank in a completely submerged position and movable into contact with said waste water for biological treatment of said waste water, said biological contactor means comprising a series of submerged rotating biological contactor assemblies having relatively closely spaced vertical surfaces and disposed along the length of said tank; aeration means adapted to act upon the waste water in said tank to provide dissolved oxygen to said waste water, said aeration means operating at the surface of the waste water in said tank; and baffle means adapted to direct waste water which has been aerated by said aeration means into contact with said submerged assemblies, said baffle means directing waste water in a serpentine path between said aeration means and said submerged assemblies, and said assemblies providing surfaces for attachment and growth of a biomass of microorganisms with the dissolved oxygen provided by said aeration means maintaining aerobic biological activity of said biomass.

Claim 9

A waste water treatment apparatus comprising a treatment tank adapted to receive waste water to be treated, biological contactor means mounted for rotation in said tank in a completely submerged position and movable into contact with said waste water for biological treatment of said waste water, rotatable biological contactor means partially submerged in said waste water at a level above said completely submerged rotatably biological contactor means, and adapted to act upon the waste water in said tank to provide dissolved oxygen to said waste water, said submerged and partially submerged biological contactor means each being comprised of a series of contactor assemblies having relatively closely spaced vertical surfaces and being disposed along the length of the tank, and baffle means for directing waste water which has been contacted by said partially submerged biological contactor means into contact with said completely submerged biological contactor means, said baffle means directing waste water in a serpentine path between said partially submerged biological contactor means and said fully submerged biological contactor means, and said fully submerged rotating biological contactor means providing surfaces for attachment and growth of a biomass of microorganisms with the dissolved oxygen provided by said partially submerged biological contactor means maintaining aerobic biological activity of said biomass.

Claim 10

A waste water treatment apparatus comprising a treatment tank adapted to receive waste water to be treated, biological contactor means mounted for rotation in said tank in a completely submerged position and movable into contact with said waste water for biological treatment of said waste water, rotatable biological contactor means partially submerged in said waste water at a level above said completely submerged rotatably biological contactor means, and adapted to act upon the waste water in said tank to provide dissolved oxygen to said waste water, said submerged and partially submerged biological contactor means each being comprised of a series of contactor assemblies having relatively closely spaced vertical surfaces and being disposed along the length of the tank, and baffle means for directing waste water which has been contacted by said partially submerged biological contactor means into contact with said completely submerged biological contactor means, said baffle means directing waste water in a serpentine path between said partially submerged biological contactor means and said fully submerged biological contactor means, and said fully submerged rotating biological contactor means providing surfaces for attachment and growth of a biomass of microorganisms with the dissolved oxygen provided by said partially submerged biological contactor means maintaining aerobic biological activity of said biomass.