Sewage purification system

• US 4,059,521 A
• Filed: 12/19/1975
• Issued: 11/22/1977
• Est. Priority Date: 12/19/1975
• Status: Expired due to Term

• Current Assignee: Roy W. Lumsden
• Original Assignee: Roy W. Lumsden
• Inventors: Lumsden, Roy W.
• Primary Examiner(s): Bascomb, Jr., Wilbur L.
• Assistant Examiner(s): Spitzer, Robert H.
• Application Number:
  US05/642,377
• Time in Patent Office: 704 Days
• Field of Search: 210/4-7, 210/14, 210/15, 210/170, 210/195 S, 210/197, 210/202, 210/220, 210/221 R, 210/532 S, 210/262
• US Class Current: 210/195.3
• CPC Class Codes: C02F 3/046 Soil filtration
• CPC Class Codes: C02F 3/1252 Cylindrical tanks with horizontal axis
• CPC Class Codes: Y02W 10/10 Biological treatment of water, waste water, or sewage

Abstract

A sewage purification system for purifying liquid sewage containing biologically degradable solid waste material. The sewage is subjected to successive treatment steps in three basic consecutive stages during which the sewage is agitated to break up the solid waste material and encourage the proliferation of microorganisms for the digestion thereof, settled to effect separation of the purified liquid component from the residual solid waste material in suspension component with recycling of the latter, and thereafter distributed into the ground.

Claims

1. An apparatus for purifying untreated liquid sewage containing biologically degradable solid waste material, which apparatus comprises, in combination:

A. means for feeding said untreated sewage into a first substantially closed elongate tank having a substantially horizontal axis and means for agitating and separate means for aerating the sewage in said tank to effect almost complete digestion thereof,

B. a second substantially closed elongate tank having a generally horizontal longitudinal axis declined with respect to the longitudinal axis of the first tank for receiving the treated sewage from the first tank and for settling the treated sewage,

C. a substantially closed collection tank disposed at the lower end of the second tank for receiving the settled sewage from the lower end of the second tank and for separating the settled sewage into a purified liquid component and a residual solid waste material in suspension component,

D. a recycle means for recycling the residual solid waste material in suspension component back to the first tank, and

E. a substantially closed third elongate tank for receiving and distributing the purified liquid component into the ground.

2. The apparatus of claim 1 wherein the first tank further includes means for filtering the sewage.

3. The apparatus of claim 1 wherein the recycle means includes:

A. conduit means disposed between the first tank and the collection tank, and

B. pump means for delivering the residual solid waste material in suspension from the collection tank to the first tank through the conduit means.

4. The apparatus of claim 1 wherein the third tank is supported on a porous bed and is further provided with a plurality of perforations along a longitudinal wall section thereof for permitting the purified liquid to drain therethrough into the porous bed.

5. The apparatus of claim 1 wherein the first, second and third elongate tanks each include at least one access chamber extending vertically from the upper portion thereof.

6. The apparatus of claim 1 wherein the first, second and third elongate tanks each have a generally cylindrical configuration.

7. The apparatus of claim 1 wherein the lower end of the second tank further includes a baffle plate for controlling the flow of settled sewage from the second tank into the lower end of the collection tank.

8. The apparatus of claim 1 wherein the longitudinal axis of the second tank is declined at an angle of approximately 10°

with respect to the longitudinal axis of the first tank.

9. An apparatus for purifying untreated liquid sewage containing biologically degradable solid waste material, which apparatus comprises in combination:

A. means for feeding said untreated sewage into a first substantially closed elongate tank having a substantially horizontal axis and means for agitating the sewage in said tank to impart a spiralling motion to the sewage along the horizontal axis of the first tank, said means for agitating including a pump for circulating the sewage and an aeration jet for directing compressed air into the sewage,

B. a second substantially closed elongate tank having a generally horizontal longitudinal axis declined with respect to the longitudinal axis of the first tank for receiving the agitated sewage from the first tank and for settling the agitated sewage,

C. a substantially closed collection tank disposed at the lower end of the second tank for receiving the settled sewage from the lower end of the second tank and for separating the settled sewage into a purified liquid component and a residual solid waste material in suspension component,

D. recycle means for recycling the residual solid waste material in suspension component back to the first tank, and

E. a substantially closed third elongate tank for receiving and distributing the purified liquid component into the ground.

10. An apparatus for purifying untreated liquid sewage containing biologically degradable solid waste material, which apparatus comprises in combination:

A. means for feeding said untreated sewage into a first substantially closed elongate tank having a substantially horizontal axis and means for agitating the sewage in said tank,

B. a second substantially closed elongate tank having a generally horizontal longitudinal axis declined with respect to the longitudinal axis of the first tank for receiving the agitated sewage from the first tank and for settling the agitated sewage,

C. a substantially closed collection tank disposed at the lower end of the second tank for receiving the settled sewage from the lower end of the second tank and for separating the settled sewage into a purified liquid component and a residual solid waste material in suspension component, said collection tank being of an elongate configuration having a vertical longitudinal axis and a vertical weir plate partially dividing the tank into two sections, said collection tank receiving said settled sewage at the lower end thereof substantially below the top of said weir plate,

D. recycle means for recycling the residual solid waste material in suspension component back to the first tank, and

E. a substantially closed third elongate tank for receiving and distributing the purified liquid component into the ground.