Sedimentation removal assembly for flow-through sedimentary tank
Solids removal assemblies ( 14 ) adapted for use in flow-through or batch-type sedimentation tanks ( 12 ) are provided which increase the efficiency of solids removal and eliminate physical scraping devices common with such sedimentation tanks. The preferred removal assemblies ( 14 ) include an elongated hood ( 34 ) disposed over a cooperating and complementally configured fill structure ( 26,28 ), which fills the majority of the internal volume of the hood ( 34 ). The hood ( 34 ) includes converging sidewalls ( 44, 46 ) having lower most inlet openings ( 54 ) and spaced, tubular outlets ( 56 ) adjacent the apex thereof. Outlet pipes ( 64 ) are operably coupled with each of the hood outlets ( 56 ) for suction withdrawal of waste water-solids suspensions which are then conveyed for downstream processing. The hood ( 34 ) and fill structure ( 26, 28 ) cooperatively define restricted flow paths for the waste water-solids suspensions, and assist in the creation of relatively high velocity movement of the suspensions to prevent bridging or clogging by collective solids adjacent the bottom of the tanks ( 12 ).
1. A solids removal assembly adapted for use in a solids removal sedimentation tank presenting a bottom wall and upright sidewalls, said assembly comprising:
an elongated hood having sloped, converging sidewalls and a top section, said hood defining an internal volume,
said hood sidewalls having lower margins adapted to rest upon said bottom wall with a plurality of inlet openings adjacent said lower margins,
said top section including a plurality of spaced apart outlet openings; and
an elongated fill structure located within said hood and occupying a majority of said internal hood volume,
said fill structure and said hood sidewalls cooperatively defining a flow path from said inlet openings towards said outlet openings.
2. The assembly of claim 1 , said sidewalls oriented at an angle of from about 50-75° from the horizontal.
3. The assembly of claim 2 , said angle being about 60°.
4. The assembly of claim 1 , said fill structure having sidewalls generally parallel with the internal surfaces of said hood sidewalls.
5. The assembly of claim 1 , said fill structure presenting a generally flat top wall.
6. The assembly of claim 1 , said fill structure occupying at least about 75% of said internal hood volume.
7. The assembly of claim 1 , said hood having a vertical height of from about 20-50 inches.
8. The assembly of claim 7 , said vertical height being from about 30-40 inches.
9. The assembly of claim 1 , said hood outlet openings comprising upstanding tubular bodies extending above the upper surface of the hood.
10. The assembly of claim 1 , including an upright outlet pipe operatively coupled with each of said hood outlet openings.
11. The assembly of claim 10 , including a flexible coupler adjoining each of said outlet pipes with a corresponding hood outlet opening.
12. The assembly of claim 1 , said hood being generally triangular in cross-section, said fill structure being generally trapezoidal in cross-section.
13. The assembly of claim 1 , said hood formed of a material selected from the group consisting of fiberglass, stainless steel and synthetic resin.
14. The assembly of claim 1 , said inlet openings extending upwardly from said hood sidewall bottom margins.
15. The assembly of claim 1 , wherein said a plurality of inlet openings are axially spaced along the bottom margin of each of said hood sidewalls.
16. A solids removal tank assembly comprising:
a sedimentation tank including a bottom wall and upstanding sidewalls and;
a sedimentation removal assembly within said tank, including
an elongated hood having sloped, converging sidewalls and a top section, said hood defining an internal volume,
said hood sidewalls having lower margins resting upon said bottom wall with a plurality of inlet openings adjacent said lower margins,
said top section including a plurality of spaced apart outlet openings; and
an elongated fill structure located within said hood and occupying a majority of said internal hood volume,
said fill structure and said hood sidewalls cooperatively defining a flow path from said inlet openings towards said outlet openings.
17. The assembly of claim 16 , said sidewalls oriented at an angle of from about 50-75° from the horizontal.
18. The assembly of claim 17 , said angle being about 60°.
19. The assembly of claim 16 , said fill structure having sidewalls generally parallel with the internal surfaces of said hood sidewalls.
20. The assembly of claim 16 , said fill structure presenting a generally flat top wall.
21. The assembly of claim 16 , said fill structure occupying at least about 75% of said internal hood volume.
22. The assembly of claim 16 , said hood having a vertical height of from about 20-50 inches.
23. The assembly of claim 22 , said vertical height being from about 30-40 inches.
24. The assembly of claim 16 , said hood outlet openings comprising upstanding tubular bodies extending above the upper surface of the hood.
25. The assembly of claim 16 , including an upright outlet pipe operatively coupled with each of said hood outlet openings.
26. The assembly of claim 25 , including a flexible coupler adjoining each of said outlet pipes with a corresponding hood outlet opening.
27. The assembly of claim 16 , said hood being generally triangular in cross-section, said fill structure being generally trapezoidal in cross-section.
28. The assembly of claim 16 , said hood formed of a material selected from the group consisting of fiberglass, stainless steel and synthetic resin.
29. The assembly of claim 16 , said inlet openings extending upwardly from said hood sidewall bottom margins.
30. The assembly of claim 16 , wherein said a plurality of inlet openings are axially spaced along the bottom margin of each of said hood sidewalls.