The primary function of a Clarifier is to separate solids from the incoming streams and to remove it from the bottom of the Clarifier tank as quickly as possible. It ensures minimum carryover in the Clarified stream. To determine the efficiency of the Clarifier unit it is considered the key parameter. The operational efficiency of the Clarifier is controlled by the configuration and placement of following basic sections of Clarifier unit :

• Inlet Section
• Clarified Water Section
• Settled Sludge Removal Section
• Overall Tank Configuration

All possible combination for the clarifier is provided to suit the specific requirement. It ensures the most optimal solution with least footprint requirement and in the most convenient configuration in the overall plant layout. The clarifier units occupy a major part of any treatmant palnt, so the footprint and layout issues are crucial. The comprehensive range of clarifier options provide us unmatched advantages to evaluate the clients' requirement and provide the best solutions in a given situation. In order to fulfill the job requirement, all these clarifier units can be equipped with the scum removal arrangement.

Types of Products

¤ Reactor Clarifier
The reactor clarifier is a Solid Contact unit where settled sludge is recirculated and mixed with the incoming stream. It is done in such a way that the already settled particles form a nuclei for particle growth through flocculation. It is created by controlled hydraulic movement of the chemically conditioned inflow stream entering the Clarifier unit. Flash mixing, flocculation and sedimentation are combined into a single unit for efficient removal of suspended solids and other associated impurities.

Reactor clarifier units have a major advantage as the smaller footprint. The desired overflow clarity can be achieved at high upflow rates that is ultimately attained by optimum placement of the overflow launders radially or circumferentially. It is done in such a way that the water upflow remains as vertical as possible with minimum disturbance to solids settling. These units can be operated with or without sludge blanket requirement. The flocculation unit is provided with variable speed to adjust the conditions during varying process requirement in actual operation. The flocculation zone is separated from the Clarification zone physically through a metallic or non-metallic cone. According to the size, the larger units are provided with bottom feed while the smaller units are provided with side feed entry. These units are available from small sizes and upto 50 M diameter & above.

¤ Circular Clarifier
The circulat clarifier are provided in various options as below :
Conventional Circular Clarifier with Central Drive: It is provided with a central rake drive mechanism that is supported on a bridge. Depending upon the clarifier tank size or plant requirement, the bridge can either be half bridge or full bridge. This is the most basic unit and is available in sizes upto 60 M diameter & above.

• Conventional Circular Clarifier with Peripheral Drive
  It is provided with a rake drive which travels on the peripheral tank wall driving the bridge. The bridge is pivoted at the centre and is carried on an adequately sized bearing supported on the centre pier. The rake arm is attached to the moving bridge. It can either be half bridge or full bridge depending upon the process requirement mostly dictated by the sludge generation. In view of the moving bridge, the power supply is provided through a slip ring assembly mounted at the centre of the bridge sourcing power supply by the electrical cable laid through the centre pier.
  
  
• Clariflocculators
  Clariflocculators with concentric flocculator zones can be provided with both the above options.
  
• Circular Clarifier with Tow Bro Header
  It is mechanically similar to the central driven conventional circular Clarifier except that sludge withdrawal is achieved hydraulically. It is done through a hollow tube forming part of the rake assembly. This arrangement has following benefits :
  • Fresher sludge with less chance of septicity is produced due to the rapid sludge removal.
  • The header design ensures gentle action ensuring maximum solid concentration and minimum disturbance for the settled sludge. This results in reduced sludge pumping cost.
  • The chances of sludge accumulation is minimized due to the uniform sludge removal across the diameter of bottom of the tank in one revolution.
  
  
  To improve the performance of the tow bro header design it can be retrofitted in the exiting tank without any significant modifications in the clarifier scrapper mechanism.
  
  
• Circular Clarifier with Rim-Flow Arrangement
  It is the peripheral feed and peripheral overflow unit where both these sections are placed on the periphery of the Clarifier tank top. These sections are combined into a single structure in such a way that the construction costs are significantly minimized. Due to greater hydraulic efficiency they offer increased overflow rates sothey are mainly used in secondary and final clarifier applications. This is achieved by reduced short circuiting due to intelligently placed feed and effluent launders ensuring that the water current passes through the longest path from feed to exit point and utilized the full tank volume. The deflector plate mounted below the feed orifices and the influent skirt baffle play an important role in this operation by uniform and gentle distribution of the feed stream into the tank.
  
  
• Circular Clarifier with Rim-Flow Tow-Bro
  This type of arrangement can be provided combining the benefits of Rim-Flow and Tow-Bro options into one unit.

¤ Rectangular Clarifier
Rectangular Clarifier has a friendly layout option providing minimum dead space between the units as these units can be placed on the common wall. The basic tank sizing will remain same in different options. The sludge removal arrangement is the basic key for its operational advantages. We can provide chain & scrapper sludge collector system of different widths for these Rectangular tanks. The widths can be upto 70' and length upto 200' & longer. These mechanisms can be made available with non-metallic components including Sprocket, Scrappers, and Chain. It ensure easier erection due to reduced weight and also longer life. The scrappers are driven through the chains on both ends of the tank. In turn it is carried on the sprocket mounted on the solid steel shafts running across the tank width and supported on the tank walls.


These clarifiers can also be provided with travelling bridge scrappers. The scrappers are mounted on the bridge which moves on the steel rails along the length on the top of the tank wall. The bridge is driven through a drive that gets the electrical supply through an independently supported decorating cabling system either along the tank or above the tank wall depending upon the site requirement. The scrapper moves the settled solids towards the discharge section in the forward movement. In the reverse movement of the bridge, the scrapper is lifted up to the water level and it moves the floating scum in the opposite direction for further disposal.

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