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Primary Clarifier Design Calculation

The clarifiers are used in water and wastewater treatment process to remove suspended solids from water under the sole influence of gravity.

This tool is useful in determining the dimensions of a rectangular clarifier.


Flow (m3/h)
SLR (m/h)
HRT (hr)
Length/width ratio
Area (m2) Height (m) Length(m)
Width (m) Minimum Weir Length (m) Optimum Weir Length (m)

Note:

  1. SLR = Surface loading rate (m/h)
  2. HRT = Hydraullic retention time (h)
  3. Maximum weir overflow rate = 10 m3/h/m
  4. The slope of the floor of a rectangular clarifier is usually 1%

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