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FERROUSFREE Iron Remover

Iron - A Brief Description

Presence of iron gives a slight / strong yellow colour to the water depending on the content of the iron.
Iron is a natural mineral and an inorganic chemical and is generally found in bore or well water.
Presence of iron in water may be attributed to the sub-soil characteristics.
Physically iron is present in two forms - Dissolved State (Ferrous ) and Suspended state Fferric Oxide / Ferric Hydroxide)
Dissolved iron cannot be filtered but suspended iron can be removed by filtration.
Dissolved iron in order to be filtered should be effectively oxidized and converted into suspended iron.
The permissible limit of iron in water should be less than 0.3 ppm (parts per million).


pH Factor

  • It is a negative logarithm of base 10 to the hydrogen ion concentration.
  • It determines the strength of acid or alkali in water.
  • Low pH can lead to more dissolved iron (ferrous) warranting increased oxidation requirements.
  • pH correction is essential in effective removal of iron.
  • pH can be corrected / neutralized by proper treatment methods.
  • The permissible limit of pH is between 6.5 and 8.5 (moles per liter)

Harmful Effects of Iron Contamination

Causes tissue damage, constipation and loss of appetite if used for consumption.
Causes reddish brown stains on over head tanks and walls damaging the aesthetics of the building.
Causes skin itching, skin rashes, hair loss and scalp damage. May lead to severe health problems in the long-term if used for bathing.
Significantly reduces the life and efficiency of washing machines, water heaters, dish washers, steam iron boxes, showers and other such appliances.
Leads to corrosion and damage of plumbing accessories, fittings, faucets, fixtures and pipes
Imparts a foul taste and odour to water. Also discolours kitchen sinks, utensils and any surface it comes in contact with. Ie., tiles, and floors.
Discolours (reddish brown) expensive clothes and fabrics.


Iron Removal Process

Technology and Process Description
The dissolved iron content needs to be converted into suspended form in order to filter it. Hence, effective removal of iron consists of two processes. ie., Aeration Process and Filtration Process.


Ferrousfree RemoversStage I - Online Aeration Process
Bore well water is pumped into an aeration tank (on-the-ground) trifurcated into equal sized chambers, The raw water is allowed to sprinkle in the first chamber through specially designed perforated sturdy sprinkler pipes. From the first chamber, the water travels to the other two chambers through precisely designed multiple vents located at variable heights of the baffle walls thus producing a zig zag motion in water.

By the time the water reaches the third chamber, it naturally establishes maximum contact with air and thereby the dissolved iron content gets oxidized and becomes suspended iron. In case the pH of the feed water is acidic, measured dosing of a suitable oxidizing agent is required to facilitate and expedite aeration.

If construction of surface aeration tank is not viable on account of space constraints, the same can be constructed under the ground (sump). In underground aeration tank aeration is facilitated through mechanical means by using a blower and diffuser. A sludge removal pump may also be used to remove the sludge precipitated underneath.

Total volume, dimensions and design of the aeration tank are vital parameters which decide the aeration efficiency of the tank.


Offline Water Aeration Process Stage I - Offline Aeration Process
Bore well water is pumped into a single chamber aeration tank ( sump or HDPE tank) through specially designed sprinklers. This water is allowed to stagnate in aeration tank for a period of 4 to 8 hours for effective aeration depending on the iron content in the raw water. In case the pH of the feed water is acidic, measured dosing of a suitable oxidizing agent is required to facilitate and expedite aeration.



Stage II - Water Filtration Process Stage II - Filtration Process
This aerated water with suspended iron particles is sent through the Ferrousfree iron remover unit with OXYRICH DFT (depth Filtration Technology) . Ferrousfree iron remover consisting of five layers of unique filter media oxidizes the leftover dissolved iron content and effectively filters the suspended iron, turbidity, suspended solids, bad colour, taste and odour by VOID creations throughtout the media depth and even-load distribution. Ferrousfree iron removers are designed based on exact flow rate formula.



Stage III- Maintenance Process

Stage II - Water Filtration ProcessBackwash Process
After the filtration process, the accumulated suspended iron particles will have to be removed from the ferrousfree unit by sending the water through reverse direction. In reverse direction, the water with sufficient pressure agitates the filter media and takes out all the iron particles through the drain port.


Rinse Process
Once the backwash is completed, the agitated media is allowed to settle by gently passing the water through the filter media.


General Features and Technical Information

The efficacy and durability of a filtration unit is ascertained based on the design basis, engineering accuracy, material of construction, media efficiency, prescribed usage and sound preventive maintenance.

An Iron Remover consists of three major parts namely i. Shell, ii. Valve and iii. Media. The design/dimensions of the plant is highly formula-driven and is primarily based on the level of iron content present in the water and the total volume of water required per day.

Iron Removers are available in Stainless Steel (SS), Mild Steel with Rubber Lining inside and Epoxy Coating outside (MSRLEC), Fibre Reinforced Polymer (FRP) and Composite vessels. Multi-port valve makes the process highly user-friendly (Less Friction Co-efficient) with its single-point operations, controls and excellent seal capability preventing internal port leaks.

Advanced and robust PP strainers (Hub and Laterals, Bell Mouth type) ensure even distribution of the inlet water into the media bed and proper collection of the treated water.

All filtration units are available in Manual, Semi-Automatic and Fully-Automatic versions.

Pre-engineered and standardized modular equipments are available for domestic and institutional requirements. For Industrial Applications and large scale operations, custom-designed iron removers can be fabricated and supplied. Air Scouring is essential in large-scale iron remover units to agitate and loosen the media for effective removal of iron precipitate and other physical contaminants during backwash.

All our products and components are manufactured / sourced under the most stringent quality control norms and tested to international quality standards in every aspect.

FERROUSFREE Iron Remover Units of less than 2,000 LPH flow rate come with a One Year Comprehensive Guarantee which covers everything including the media and also a Special Guarantee of 5 years for the vessel.

OPTIONAL ACCESSORIES : Field-Mounted Digital Flow Meter/ Totalizer, Air-Scouring Mechanism.

A detailed analysis of the raw water will help us configure the right product.


General Applications

  • Used to remove high iron content in ground water (open well and bore well)
  • Used to remove the turbidity and suspended solids in municipal and corporation supplied water along with the pipe line induced iron content.
  • Used as a pre-treatment to softeners, DM units, RO Plants and all other water treatment plants if the iron content in the raw water is more than the permissible limits.

Water Iron Removal Process

Water Iron Removal Process

Water Iron Removal Process

Water Iron Removal Process

Water Iron Removal Process

Water Iron Removal Process

Water Iron Removal Process