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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
Bar Racks: Kinds
3
Bar Racks: Structures
Declined Mechanically-cleaned Bar Rack
4
Bar Racks: Structures
Bar Rack Accommodation
5
Bar Racks: Basic Parameters
a) design scheme б) bars cross sections
6
Grit Chambers: Kinds
Horizontal Classical Circular Aerated
Vertical Tangential
Single Combined with grease
separating chamber
Mechanically-cleaned Hydraulically-cleaned
7
Grit Chambers: Structures
Classical Horizontal Grit Chamber
8
Grit Chambers: Structures
Horizontal Circular Grit Chamber
9
Grit Chambers: Structures
Horizontal Aerated Grit Chamber
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Grit Chambers: Basic Parameters
Velocities Diagram for the Horizontal Aerated Grit Chamber
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
Settling Tanks: Structures
Horizontal Settling Tank
13
Settling Tanks: Structures
Details of Horizontal Settling Tanks Inlets and Outlets
14
Settling Tanks: Structures
Radial Settling Tank
15
Settling Tanks: Structures
Vertical Settling Tank
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Settling Tanks: Structures
Imhoff Tank
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Settling Tanks: Basic Parameters
Settling Kinetics