Iron Removal Media – Iron Removal Filter
(with Katalox-Light®)

Iron is a common water contaminant. Iron removal can be difficult because it may change its valence state that changes from the water-soluble ferrous state (Fe2+) to the insoluble Ferric state (Fe3+). When Oxygen or an oxidizing agent is introduced, ferrous states change to ferric which is insoluble and it precipitates, leading to a rusty (red-brown) appearance in the water. This change can occur when deep well water is pumped into a distribution system where it adsorbs oxygen. Ferric iron has to be removed before it destroys valves, piping all other water treatment equipment, and water-using devices. KATALOX LIGHT® provides a large filtration area and high catalyst to speed up the process.



Chemical Oxidation

The atmospheric oxygen which is introduced into water during aeration is usually effective in the oxidation of Iron (II). However, when the iron is organically complexed , aeration alone is not sufficient. Secondly, IRON OXIDATION is very slow at pH 7.0. Alternative Oxidants like OXYDES, Chlorine or Hydrogen Peroxide could be employed for Iron Oxidation when aeration is not satisfactory. Chemical oxidation is frequently applied when Iron and Manganese are to be removed simultaneously in a single filtration step and Manganese Oxygenation is very slow at pH 9.5;
The Oxidation of IRON (II) by different oxidants can be described by the following chemical reactions:

OXYDES (solid state H2O2)

2Fe2+ + H2O2 + 4H2O →2Fe(OH)3 + 4H+


2Fe2+ + Cl2 + H2O → 2Fe(OH)3 + 2Cl- + 6H4

Hydrogen peroxide

2Fe2+ + H2O2 + 4H2O → 2Fe(OH)3 + 4H+


(with Katalox-Light®)

If Manganese is not removed it can lead to health problems, staining or discolored water in the distribution systems. The removal of dissolved manganese from water requires a strong catalyst such as KATALOX LIGHT® to handle pH and an oxidant such as OXYDES, Chlorine or Hydrogen peroxide.
Manganese precipitates out faster with higher pH-values and greater concentration of oxidant.

The reaction with Katalox-Light:

2CO2 + Ca(OH)2 = Ca(HCO3)2

Mn(HCO3)2 + O + Ca(OH)2 = MnO2 + Ca(HCO3)2 + H2O

Waters containing carbonate hardness and a little free Carbon dioxide (CO2) have a pH of about 7.5 to 8.5 or over.



Fast reaction with

Mn(II) + MnO2 (Katalox-Light) Mn (II) MnO2

Because of its adsorptive properties, KATALOX LIGHT® (MnO2) accelerates the removal of Mn(II) form solution and causes the mixed oxide to form. It is the presence of this manganese dioxide ratio on the Zeosorb® filter media that makes the removal of Mn(II) during oxide coated media filtration so effective. It makes it the most effective media available in the water treatment industry. Another benefit to use KATALOX LIGHT® media is that comparatively higher filtration rates are possible with the application to remove iron and manganese as it raises pH. The increased pH rate can increase higher filtration rate, reduced filter size and construction costs.

With KATALOX LIGHT® Filtration velocity of 4 – 12 gpm/ft2 ( 10 – 30 m/h) can be achieved.

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