How do you treat water with high iron content?

Firestly by oxydation fe2 to fe3

Or by airation the water in simple process

1- RO 

2- Oxidatin from Fe2+ to Fe3+, then filteratin

industrial water softeners can remove dissolved ferrous iron by ion exchange

Relatively high concentrations of inorganic iron, whether ferrous or ferric (dissolved or precipitated), may be removed with iron filters. They are similar in appearance and size to conventional water softeners but contain beds of media which have mild oxidizing power. As the iron-bearing water is passed through the bed, any soluble ferrous iron is converted to the insoluble ferric state and then filtered from the water. Any previously precipitated iron is removed by simple mechanical filtration.

POLYPHOSPHATE TREATMENT :

Polyphosphates react with dissolved iron by trapping them in a complex molecule that is soluble in water . As a result the iron are not available to react with oxygen and precipitate. Polyphosphates can be fed into the water system with controlled injection equipment. Polyphosphates are not stable at high temperatures. If water is treated prior to heating in a water heater, the polyphosphates will release iron in the heater as it breaks down. The released iron will then react with oxygen and precipitate.

Polyphosphates protect dissolved iron from reacting with oxygen and precipitating on household appliances, bath/plumbing fixtures, and laundry.

Polyphosphate treatment is a relatively cheap way to treat water for low levels of iron. Depending on the type of polyphosphate used, water with1 to3 ppm of iron can be adequately treated.

Hi

First of all what is the purpose of the treatment?

If it is for potable use without desalination the easiest way is to oxidise iron using aeration or chlorine then filtration.

if it is pretreatment for RO then you have two choicese:

1- Oxidise the iron Fe2+ to Fe3+ then filtration

2- Keep iron in soluble form Fe2+ and RO will reject it (you have to make sure that there is no dissolved oxygen in water)

1-R.O

2- ADD OXIDE FOR PPT. IRON IONد