Iron Removal
  • Iron removal

    This process consists in removing the iron ions responsible for the staining proprieties of ferruginous water. Indeed, iron present in water stains a series of materials and deposits in pipeline networks. This treatment enables to avoid it and prevents the clogging of metering equipment, turbines, nozzle pipes and other devices in contact with ferruginous water.

Iron removal is based on the controlled precipitation of dissolved iron and manganese ions. This process consists in oxidising the iron ions, generally done by mixing air to the water, followed by the sand filtration of the resulting precipitate.

The waters pH is an important technical data for this type of water treatment process. The removal of iron ions is generally less demanding than for manganese ions. For high concentrations of iron ions in water, a series of several treatments are sometimes necessary.

Iron and/or manganese complexes can be very difficult to remove. In this case the use of ozone instead of air as the oxidizing agent can be a good alternative. In addition to ozone and oxygen, the oxidation can be carried out by a variety of chemicals such as chlorine, chlorine dioxide and potassium permanganate (see our comparative table of various oxidation processes).


It is also possible to remove iron by precipitation under its carbonate form or by using a ion exchange system. An ion exchange process is used for small Fe2+ concentrations. Moreover, ion exchange resins also remove other cations such as Ca2+ and are therefore used only when the flow rate and concentrations of iron and manganese ions are low.

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