Clarifier Design and Operation: Settlement Tank Guide

April 26, 2026

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Clarifiers are settling tanks designed to remove suspended solids from water or wastewater by gravity.

Types of Clarifiers

  • Primary Clarifiers: Remove settleable organic solids
  • Secondary Clarifiers: Separate biomass in activated sludge
  • Lamella Clarifiers: Inclined plate settlers for compact design

Design Parameters

Surface overflow rate, detention time, and weir loading rate are key design considerations.

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Clarifier Design and Operation: Settlement Tank Guide