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Clarifiers are extensively used to remove settled solids through the centrally located solids pocket in both primary and secondary treatment.

Primary clarifiers are used in the primary treatment section wherein the removal of suspended solids, heavy metallic sludge as in metal/ mineral benefaction units etc is the primary concern. Secondary clarifiers are installed in bio sludge separation units and are not provided with scum separators.

Paramount Limited makes clarifier mechanism which is suitable for installation either in RCC/ Steel tank. The recommended slope is 1:12 at the bottom of the clarifier tank for efficient removal of sludge. The sludge is scrapped from the bottom of the tank by rotating scrapper arm. Primary clarifiers are inbuilt with floating scum separation box and skimmers. The skimmers gently skim the liquid to surface attached to a rotating skimmer arm.

The following models are available.

1 Central driven, bridge supported mechanism
2 Cage driven (Type C) clarifier mechanism
3 Peripheral driven clarifier mechanism

 

Salient features of Central driven, bridge supported mechanism:

1 A proprietary drive unit comprising of worm and worm wheel gear unit connected to a standard gear box by means of sprockets and chain arrangement and gear box connected directly to the motor.
2 A super structure comprising of steel structural bridge spanning up to half the diameter of the tank. The bridge is driven at the centre by a motor and gear box. The bridge is provided with chequered plate/ steel grating. Mild steel hand railing and trolley with steel tyred wheel/ traction wheel on rails. The full bridge can be provided on request.
3 The rake arms are suspended from the bridge for efficient raking of solids. The rake arms are provided with brass/ neoprene squeezes and rake the bottom twice per revolution in case of a double scrapper and once per revolution in case of single scrapper.
4 Necessary weir plates along with fixing bolts to be fixed to the outlet launder can be provided on request.
5 Immersed parts can be provided with lining in rubber/ FRP
6 Floating scum scrapper with scum box & high torque switch or torque switch with lifting mechanism can also be provided.

 

Salient features of Cage driven (Type C) clarifier mechanism:


1 Proprietary drive unit consisting of primary cast iron/steel internal spur gear rotated by a secondary worm and worm wheel gear supported on the central RCC column.
2 Feed well of suitable diameter is fixed to the bridge is also provided to introduce the feed into the clarifier. 
3 Access to the drive unit is through a structural steel spanning half the diameter of the tank as per data sheet & is provided with walkway, handrail and foundation bolts for fixing the bridge on tank walls. The full bridge can be provided on request.
4 The drive unit rotates the structural steel cage attached to the internal gear and the two rake arms connect to the cage which rakes the tank bottom twice per revolution.
5 The feed is let into the clarifier through the hollowed centre column at the bottom or feed pipe at the top. The clarified water is collected through peripheral launder and settled solids through the centre of the tank.
6 Necessary weir plates along with fixing bolts to be fixed to the outlet launder can also be provided on request.
7 Immersed parts can be provided with lining in rubber/ FRP.
8 Floating scum scrapper with scum box & high torque switch or torque switch with lifting mechanism can also be provided.

 

Salient features of Peripheral driven clarifier mechanism:

1 A proprietary drive unit comprising of worm and worm wheel gear unit connected to a standard gear box by means of sprockets and chain arrangement and gear box connected directly to the motor.
2 A super structure comprising of steel structural bridge spanning up to half the diameter of tank. The bridge is driven at the periphery by a motor and gear box. The bridge is provided with chequered plate/ steel grating. Mild steel hand railing and trolley with steel tyred wheel/ traction wheel on rails. The full bridge can be provided on request.
3 The rake arms are suspended from the bridge for efficient raking of solids. The rake arms are provided with brass/neoprene squeezes and rake the bottom twice per revolution in case of a double scrapper and once per revolution in case of single scrapper.
4 Necessary weir plates along with fixing bolts to be fixed to the outlet launder can also be provided on request.
5 Immersed parts can be provided with lining in rubber/ FRP.
6 Floating scum scrapper with scum box & high torque switch can also be provided.

 

 
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