Chemical Agitators, Chemical Mixers, Chemical Agitators Manufacturer, Chemical Mixers Supplier, Mumbai, India
Sintered Bearing, Bearing Bushes, Mumbai, India

Drive Heads

  Motorized Lifting Device
  HRSCC Drives
  Drive Head
  Drive Head with Manual Lifting Device
Sintered Bearing, Bearing Bushes, Mumbai, India

Center Mechanism

  Center Mechanism Drives
Sintered Bearing, Bearing Bushes, Mumbai, India
Clarifier peripherally driven
  Clarifier Peripherally Driven Single Rake
  Clarifier Peripherally Driven Double Rake
Sintered Bearing, Bearing Bushes, Mumbai, India
Centrally Driven Clarifiers
  Centrally Driven Clarifier
  Centrally Driven Clarifiers
Sintered Bearing, Bearing Bushes, Mumbai, India
ClariFlocculator.
  Clariflocculator Peripheral Driven HF Type
  Clariflocculator Peripheral Driven IF Type
  Clariflocculator Centrally Driven
Sintered Bearing, Bearing Bushes, Mumbai, India
Thickener
  Thickener Mechanism (centrally Driven)
  Thickener Mechanism, Centrally Driven
Sintered Bearing, Bearing Bushes, Mumbai, India
Degritting Mechanism
Sintered Bearing, Bearing Bushes, Mumbai, India
Aerator
  Surface Aerator
  Floating Aerator
Sintered Bearing, Bearing Bushes, Mumbai, India

Media Filter

  Dual Media Filter
  Activated Carbon Filters
  Trickling Filter
Sintered Bearing, Bearing Bushes, Mumbai, India
Rotary vacuum disc filters
  Rotary Vacuum Disc Filters
Sintered Bearing, Bearing Bushes, Mumbai, India

Hydrocyclones

Sintered Bearing, Bearing Bushes, Mumbai, India
Mechanical Bar Screens
  Rotary Bar Screen
  Self Cleaning S Type Mechanical Bar Screen
Sintered Bearing, Bearing Bushes, Mumbai, India
Drum Filters
  Rotary Vacuum Drum Filter
  Drum Filter Discharge Types
  Precoat Drum Filters
Sintered Bearing, Bearing Bushes, Mumbai, India
Lime Slaker
  Drum Slaker
  Lime Slaker
Sintered Bearing, Bearing Bushes, Mumbai, India
High Rate Solids Contact Clarifier
  BRIDGE & SCRAPER MECHANISM
  Recirculation Mechanism

Sintered Bearing, Bearing Bushes, Mumbai, India

Sedimentation

 

INTRODUCTION

Sedimentation is the process of letting suspended solids settle by gravity. This is accomplished by decreasing the velocity of the slurry/liquid being treated to nearly half the settling rate of suspended solids in a tank.

We also assist your team to establish detention time, settling rate/overflow rate and settling area for the design flow necessary for sizing of the settling tank for various process applications.

Commonly known as gravity settlers by process engineers these are tanks where solids are settled naturally or with chemical aid and concentrated slurry is removed as underflow and clarified liquid as overflow.

A mechanism is used in these gravity settlers, to scrape the settled sludge at the bottom of the tank towards the central sludge pit continuously. The mechanism is driven by a “Drive System” mounted on the support beams or concrete pier at the top of the tank. The liquid overflows through the peripheral weir at defined loading to ensure desired velocity resulting in proper clarification.

At INDOFAB we specialize in design of the mechanism to ensure proper sedimentation process and efficient sludge removal with appropriate “Drive Systems” to handle the torque requirement of various range of settled sludge for different applications.

The different types of “MECHANISMS” are described below :

   
 

BRIDGE MOUNTED MECHANISMS

Alias A-TYPE / FIXED BRIDGE / CENTRAL DRIVEN MECHANISMS

In this type of Mechanism Design a High Torque Drive / Drive Head is supported by a fixed bridge spanning the tank known as mechanism support and Central shaft suspends both rake arms to sweep full tank bottom once or twice every revolution. The load /Torque on the rake arm is defined by the process & the concentration which in turn dictates the complete Mechanism Design.

A carefully Designed Mechanism ensures the process runs flawlessly for decades together. A feed well is ofen used to kill the turbulence, ensuring the sludge blanket at bottom or overflow hydraulics are not affected. Optionally Skimmers, Weirs, Baffles, Sludge Sampling systems (TSDP) are offered. A Typical Drive System for above mechanism comprises of Cast Worm Wheel driven by Alloy steel Worm & Worm Shaft enclosed in cast iron Housing & cover, Inturn driven by a helical / worm gear box & motor. When deployed for Thickening applicaons in mainly Inorganic slurries the drives are equipped with Motorized or Hydraulic auto lifting mechanism to cater high % of solids and overcome frequent overloads.

These types of Mechanisms are used as:

 
  BRIDGE MOUNTED MECHANISMS
   
 

Lifting Assembly

Motorised lifting device enables lifting of scrapper mechanism during operaon with increase in load & vice versa. Coupled with appropriate mechanical / digital overload it operates (lifts) automatically ensuring safe operations at high / surge loads.

  Lifting Assembly
   
  Skimmer Arm Scum Trough
  The rotating skimmer sweeps the surface of clarifier with a blade attached to skimmer arm.
Grease, free oils, organic matter and other floatable materials are separated as it slowly spirals around and is swept into the scum trough for discharge in slumpit outside sedimentation tank
  Skimmer Arm Scum Trough
   
 

Rake With Blades

Rake arms with scrapping blades & sweeping squeezers while rotating sweep the entire tank bottom. Each rotation of rake arms generates a spiral sweep to move settled sludge towards discharge cone at center. Different sweep profiles made for different applications based on Indofab’s design expertise.

  Rake With Blades

   
 

COLUMN MOUNTED MECHANISMS:

Alias S-TYPE / PIER MOUNTED / CENTRAL DRIVEN

These Mechanisms are supported by a stationary centre column of steel or concrete. The centre column supports the drive and rake mechanisms, while the truss extending from the centre pier to the tank periphery supports the walkway, power lines and feed launder. These systems are generally preferred for larger diameters and heavy duty applications due to the sturdy Turn Table Drives & Heavy Structural design of Centre Cage suspending the Long & short rake arms.

A feed well is often used to kill the turbulence, ensuring the sludge blanket at bottom or overflow hydraulics are not affected. Optionally Skimmers, Weirs, Baffles, Sludge Sampling systems (TSDP) are offered. A Typical drive systems consists of a Heavy Duty Turn Table mounted on Centre Pier & supporting the rotary Internal Gear suspending the Centre Cage . The Cast Internal gear is inturn driven by alloy steel pinion. A typical Upper Worm & Wheel with Housing & cover drives the Pinion from top. The Whole Drive System is completed when a Motor and Helical Gear box drives the upper worm & wheel system as shown in the typical arrangement below.

These types of Mechanisms are used for :

 
   
  TYPICAL ARRANGEMENT
  TYPICAL ARRANGEMENT
   
  HEAVY DUTY DUAL PINION DRIVE
  HEAVY DUTY DUAL PINION DRIVE

   
 

PERIPHERAL DRIVEN MECHANISMS

Alias ROTATING BRIDGE / TRACTION DRIVEN MECHANISMS

Tracon Mechanisms are considered more economical with lower solid content the are with single rake arm suspended from rotating bridge, & having a single Worm Gear box & Motor Driving the Peripheral Traction wheels. The system mainly consists of a Central Turn Table of suitable rating with a Pivot arrangement on which rests the rotating bridge; A carriage with two PU or Rubber Lined Wheels carries & rotates the bridge from the periphery along the Circular path of tank.

The Traction Mechanisms are preferred for Large diameters with Single as well as double sweep which can be achieved by putting two drives or designing a centre cage + rake arms suspended from rotating bridge. Skimmers, Scum Trough & Baffles with these mechanisms can be very sturdy in design and are offered as an optional feature.

These types of Mechanisms are used for :

 
   
 

MATERIAL OF CONSTRUCTION

Sedimentation Equipment's Preferred Material of Construction (MOC) for Various components offered to our clients are mainly in Mild Steel Epoxy Painted, Mild Steel with Hot Dip Galvanized; Mild Steel FRP Lined; Mild Steel Rubber Lined, AISI 304/L , AISI 316/L.

Selection of MOC are normally recommended by Process Designers/consultants/clients based on slurry/liquid characteriscs &
application.

   
 

TYPICAL APPLICATIONS :

Removal of Mud, Flocs, Slow settling Suspended Solids in WTP , ETP & STP.
Industrial Applications for settling & concentrating mud, ore, trade wastes, lime, chemical salts, beneficiation processes.

   
 
   

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