Device for aerating waste water

• US 5,522,989 A
• Filed: 10/12/1993
• Issued: 06/04/1996
• Est. Priority Date: 10/14/1992
• Status: Expired due to Fees

• Current Assignee: Hubert Company
• Original Assignee: Hubert Company
• Inventors: Hove, Dirk T.
• Primary Examiner(s): WYSE, THOMAS G
• Application Number:
  US08/135,170
• Time in Patent Office: 966 Days
• Field of Search: 210/219, 210/771.1, 261/91-93, 416/183-185, 416/186 R, 416/189
• US Class Current: 210/219
• CPC Class Codes: B01F 23/234211 Stirrers thereof
• CPC Class Codes: B01F 27/112 with arms, paddles, vanes or blades
• CPC Class Codes: B01F 27/1152 with separate elements other than discs fixed on the discs, e.g. vanes fixed on the discs
• CPC Class Codes: C02F 3/16 the aerator having a vertical axis
• CPC Class Codes: Y02W 10/10 Biological treatment of water, waste water, or sewage

Abstract

A method for aerating waste water, wherein the interface area between air and waste water is enlarged by splashing the water by means of blades and wherein the sludge present in the waste water is kept in suspension by creating flows and/or turbulence in the water. The waste water is set in motion by moving a plurality of blades arranged in a circle through the waste water, in such a manner that the connecting parts interconnecting the blades substantially do not extend into the waste water. The device for aerating waste water is provided with a container for waste water and with a rotor being rotatable about a substantially vertical axis, whose portion pointing downwards may extend into the waste water. The rotor comprises blades having surfaces which are substantially radially and axially oriented, whereby the blade surfaces are at least partially located below the rotor parts interconnecting the blades so that the connecting parts substantially do not extend into the waste water.

Claims

1. A rotor for aerating waste water by extending partially into the surface of the water to be aerated and which rotates about a vertical axis of rotation comprising, a plate-shaped member oriented perpendicular to said axis of rotation and a plurality of plate-shaped blades extending from both sides of said plate-shaped member in a direction which is parallel to and radially outwardly spaced from said axis of rotation of said rotor.

2. A rotor according to claim 1 wherein said plate-shaped member includes a recessed portion at its peripheral extent at the leading edge of each said blade.

3. A rotor according to claim 1 wherein said plate-shaped member is positioned above the surface of the water to be aerated and said plate-shaped blades extending downwardly from said plate-shaped member are disposed in the water to be aerated.

4. A rotor according to claim 1 or 3 wherein the width of said plate-shaped portion of each blade extending downwardly from said plate-shaped member decreases from a maximum width at the juncture of said blade and said plate member.

5. A rotor according to claim 1 wherein the plate-shaped portion of each blade extending upwardly from said plate-shaped member blends into a portion bent in the direction of rotation of said rotor.

6. A rotor according to claim 5 wherein said bent portion of each said blade slopes radially inwardly and downwardly from its outer edge to said plate-shaped member.

7. A rotor according to claim 5 wherein said bent portion is attached to said plate-shaped member.