Transcript 4Wastewater Treatment7

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
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Disk
Drum
Wing
 Comminutors
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Bar Racks: Kinds
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Bar Racks: Structures
Declined Mechanically-cleaned Bar Rack
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Bar Racks: Structures
Bar Rack Accommodation
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Bar Racks: Basic Parameters
a) design scheme
б) bars cross sections
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Grit Chambers: Kinds
 Horizontal
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Classical
Circular
Aerated
 Vertical
 Tangential
 Single
 Combined with grease
separating chamber
 Mechanically-cleaned
 Hydraulically-cleaned
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Grit Chambers: Structures
Classical Horizontal Grit Chamber
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Grit Chambers: Structures
Horizontal Circular Grit Chamber
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Grit Chambers: Structures
Horizontal Aerated Grit
Chamber
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Grit Chambers: Basic Parameters
Velocities Diagram for the Horizontal
Aerated Grit Chamber
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Settling Tanks: Kinds
I. According to their technological functions
 Primary settling tanks
 Secondary clarifiers
II. According to their construction


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Horizontal
Radial
Vertical
Combined with other technological units
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Imhoff tanks
Aerated tanks/secondary clarifiers
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Settling Tanks: Structures
Horizontal Settling Tank
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Settling Tanks: Structures
Details of Horizontal Settling Tanks Inlets and Outlets
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Settling Tanks:
Structures
Radial Settling Tank
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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
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