ClearStream - Plow Style Segmented Rake
Raking blades turned at an approximately 45 degree angle are supported from two structural support arms. The settled sludge is plowed inward from one blade to another until it is deposited into a sludge pit.
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Advantages
- Simple design.
- Nothing to “plug up” under water.
- Regardless of solids loading settled sludge will be transported to the sludge pit.
Disadvantages
- Sludge transport from the outside may take many hours, especially on large (>100’ diameter) units, leading to the potential of septicity.
- Under high flows and/or high solids loading conditions, the raking mechanism may not be able to transport solids as quickly as they are settling, causing a buildup of solids in the basin. The deeper sludge blanket can lead to scouring and short circuiting.
Variations
- Change to the angle of the blade to the radius.
- Increase the depth of all the blades.
- Increase the depth of each blade as it gets nearer to the center and settle sludge sump.
- Add two more half radius arms to aid in solids transport for clarifiers larger than 100’.
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