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A clarifier is generally used to remove solid particulates or suspended solids from liquid for clarification and (or) thickening. Concentrated impurities, discharged from the bottom of the tank are known as sludge, while the particles that float to the surface of the liquid are called scum.

Our Clarifiers are available in self-supporting prefabricated steel units or they can be designed for installation in a concrete tank. Existing structures and systems can sometimes be utilized and upgraded for cost savings.

Circular Clarifiers normally utilize a center feed inlet well or a peripheral inlet. The center feed well design can be equipped with a chemical addition system with mixing and flocculation. With the center feed well, the effluent is discharged along the outer wall of the clarifier tank. Clarifiers with peripheral inlets will be designed with a center bottom liquid outlet.

Types of Clarifier

  1. Bridge Mounted Central Driven Type

  2. Peripheral Driven Type


Bridge truss spans the full diameter of the tank.  Feed well, drive and rake mechanism are supported by the bridge truss. Worm and worm wheel type drive head powers and vertical centre shaft carry the rake arms.  Feed enters through the central feed well. Clear overflow is collected in a peripheral launder whereas the settled solids  are discharged from the central sludge pocket.


Stationary centre pier partially supports the rake mechanism and serves as pivot about which rake rotates.  Traction bridge is supported on a turn table at one end and driven by a traction carriage assembly at the other end. Feed is introduced into a feed well at the centre of the tank.  The rakes supported from rotating bridge scrapes the settled solids to central sludge pocket.  Clear overflow is collected in a peripheral launder and the settled solids are discharged from the central sludge pocket.

  • Traction bridge rest over the Center Mechanism / Slewing Ring and supported with hinge pin/pivot arrangement.

  • Slip Ring (Current Collector) assembly is provided.

periferal type_edited.jpg

Main Parts Of Clarifier

  • Bridge

  • Rake Arm

  • Scrapper

  • Feed Well

  • scum Collector

  • Skimmer Arm

  • Drive Head

  • Slip ring

  • V-Notched Weir

  • Scum Baffle

  • slip rings (current collector)

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