Shivpad Engineers Pvt. Ltd,
Plot #3/86-E, ATC Road, 2nd Main Road,
Ambattur Industrial Estate,
Chennai – 600 058.
Tamilnadu, INDIA.
Ph: +9144 4860 6201 | 4860 6203
Shivpad Clarifier find wide application in the treatment of industrial and domestic water treatment and wastewater treatment plants. They afford better-suspended solids removal in the primary treatment and aid solid liquid separation of biologically treated secondary effluent.  These units help to achieve a superior quality effluent as well as to maintain a high underflow solids concentration.


Primary Clarifiers serve to

  • Remove settleable solids.
  • Remove free oil, grease and other floating materials.
  • Reduce the organic loading to subsequent biological units.

Secondary Clarifiers aid in

  • Solids liquid separation of biologically treated effluent.
  • Thickening the underflow sludge concentration desirable for efficient operation or to prevent process upsets of activated sludge system.
  • Achieving an effluent of excellent quality.


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 desludged 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. Supply range is upto 60 Meters diameter.



The drive mechanism  is supported by a stationary centre pier.  A structural steel cage suspended from the drive mechanism carries the rake arms.  A structural bridge extending from centre to periphery of the tank serves as walkway.  Feed is given to the tank serves as the centre of the machine. Clear overflow is received at the peripheral launder and sludge raked by the rake arms is discharged from the sludge pocket.

Skimmers are provided whenever duty conditions are demanding and these are assembled with the central shaft and scraper arm supports.  These help to remove floating materials from the liquid surface.  The surface skimmer arms provided with rubber flaps help in the removal of floating materials and grease.  The skimmings are collected in a scum trough supported on tank inner wall which will ultimately drain the skimmings.

Shivpad  offers an overload alarm protection to provide positive warning to protect against equipment damage should excess loading occur.  The electro-mechanical overload alarm is mounted on the worm shaft end of the drive head.  Alarm and drive cut-off switches are provided to warn of an impending overload or to stop the equipment, if the capacity of the load exceeds.

Sludge removal equipment offered by Shivpad consists of a pair of endless conveyor chains.  Attached to the chains at regular intervals are scraper flights of wood or steel cladded wooden flights extending the full width of the tank.  These scraper flights travel from feed end to the sludge collection end at a specified speed. The solids settling in the tank are scraped to sludge hoppers by the scraper flights.

Supporting arrangements for the scraper plates are guide rails installed on either side of tank walls and also on the tank floor, Easily replaceable ductile iron guide blocks assembled to the sides and bottom of scraper flights facilitate from minimum wear and increase in operating life of the mechanism.

If scum removal becomes necessary, the design of Shivpad has provision to offer the equipment with same scraper flights carrying our scum removal operation at liquid surface on their return travel.  Most common scum draw-off facility is offered with horizontal slotted pipe that can be rotated by a lever or by a gear and head stock assembly.


Travelling Bridge Type Clarifier

Mechanism is meant for rectangular tanks which consists of a trolley bridge spanning the entire width of the tank and travels on a pair of rails fixed on either side of the tank top longitudinally.  The scrapper frame and float assembly connected to the bottom of trolley bridge can be hoisted and lowered by an independent drive.  Trolley bridge longitudinal travel drive is reversible in operation and actuate the trolley in both forward and reverse directions alternately.


During forward travel the sludge settled at the bottom is scraped and collected in the sludge disposal pit whereas during the return travel scum and floating materials get pushed to the scum collection end from where scum collection can be carried out by various methods.  One of the standard collection systems offered is rotatable slotted oil pipe assembly and the other is motorized brush type scum collector. Travel Bridge Type Clarifiers are more suited for long rectangular tanks of less width.

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