Wastewater Treatment Technologies Bar Racks.PPT

Mechanical Wastewater Treatment

1. 1
IV. Wastewater Treatment Technologies
Topic IV. 7. Mechanical Wastewater Treatment
Facilities - Bar Racks, Grit Chambers, Settling
Tanks: Kinds, Structures, Basic Parameters
Bar Racks
Kinds:
Coarse (b = 30 - 120 mm)
Fine (b = 16 - 25 mm)
Vertical
Declined
Hand-cleaned
Mechanically-cleaned
Fixed
Removable
Rotating

Disk

Drum

Wing
Comminutors

2. 2
Bar Racks: Kinds

3. 3
Bar Racks: Structures
Declined Mechanically-cleaned Bar Rack

4. 4
Bar Racks: Structures
Bar Rack Accommodation

5. 5
Bar Racks: Basic Parameters
a) design scheme б) bars cross sections

6. 6
Grit Chambers: Kinds
Horizontal

Classical

Circular

Aerated
Vertical
Tangential
Single
Combined with grease
separating chamber
Mechanically-cleaned
Hydraulically-cleaned

7. 7
Grit Chambers: Structures
Classical Horizontal Grit Chamber

8. 8
Grit Chambers: Structures
Horizontal Circular Grit Chamber

9. 9
Grit Chambers: Structures
Horizontal Aerated Grit
Chamber

10. 10
Grit Chambers: Basic Parameters
Velocities Diagram for the Horizontal
Aerated Grit Chamber

11. 11
Settling Tanks: Kinds
I. According to their technological functions
Primary settling tanks
Secondary clarifiers
II. According to their construction
Horizontal
Radial
Vertical
Combined with other technological units

Imhoff tanks

Aerated tanks/secondary clarifiers

12. 12
Settling Tanks: Structures
Horizontal Settling Tank

13. 13
Settling Tanks: Structures
Details of Horizontal Settling Tanks Inlets and Outlets

14. 14
Settling Tanks:
Structures
Radial Settling Tank

15. 15
Settling Tanks:
Structures
Vertical Settling Tank

16. 16
Settling Tanks:
Structures
Imhoff Tank

17. 17
Settling Tanks: Basic Parameters
Settling Kinetics