Wastewater Treatment

1. 1
Wastewater Treatment Technologies
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