Circular clarifiers with rotationcontrolled settling

• US 3,216,570 A
• Filed: 12/08/1960
• Issued: 11/09/1965
• Est. Priority Date: 12/08/1960
• Status: Expired due to Term

• Current Assignee: Joseph Cunetta
• Original Assignee: Joseph Cunetta
• Inventors: JOSEPH CUNETTA
• Application Number:
  US04/074,513
• Time in Patent Office: 1,797 Days
• US Class Current: 210/803
• CPC Class Codes: B01D 21/06 with rotating scrapers
• CPC Class Codes: B01D 21/2427 The feed or discharge opening located at a distant position from the side walls
• CPC Class Codes: B01D 21/34 Controlling the feed distribution; Controlling the liquid level ; Control of process parameters

Claims

1. A METHOD OF CLARIFYING A LIQUID HAVING SETTEABLE SOLIDS THEREIN OF THE NATURE OF ACTIVATED SLUDGE INCLUDING MAINTAINING IN A GENERALLY QUIESCENT STATE FOR SETTLING SUBSTANTIAL BODY OF THE LIQUID IN A TANK HAVING A FLOOR AND EFFLUENT TROUGH ALONG THE TANK PERIPHERY, CONTUNUOUSLY RELEASING LIQUID TO BE CLARIFIED INTO THE TANK CENTRALLY THEREOF, THEREBY DISPLACING SURFACE WATER INTO THE EFFLUENT TROUGH, ROTATING SUBSTANTIALLY THE ENTIRE LOWER PORTIONS OF THE BODY AT A SPEED SELECTED TO CAUSE THE SETTLING SOLIDS TO SETTLE PREDOMINATELY, AND TO A GREATER EXTENT THAN WOULD BE THE CASE WITHOUT SUCH ROTATION, ON A CENTRAL AREA OF THE FLOOR SPACED SUBSTANTIALLY INWARDLY FROM BENEATH THE EFFLUENT TROUGH, AND REMOVING THE SOLIDS SETTLED ON SAID AREA FROM THE TANK CONTINUOUSLY AND PROMPTLY.