Comparison of Rectangular and Circular Clarifier


The selection of type of primary clarifier depends on: 

  • Regulation and preference of regulatory authorities 
  • Size of installation 
  • Local site condition 


The advantages and disadvantages of rectangular clarifiers over circular clarifiers are summarized below: 

  • Advantages:
    • Occupy less space when multiple units used 
    • Provide longer travel distance for settling to occur 
    • Less short circuiting 
  • Disadvantage: 
    • Possible dead corners 
    • Sensitive to flow surges 
    • Restricted in width by collecting equipment 
    • Higher maintenance costs of sprocket, chains & flights 
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If you have any suggestion, please email Professor Roy at droy@poly.edu