Deferrization from 10 ppm to 0.1 ppm 1

[ione]

I'd posted this question in another forum with no success. I hope this is the right place to collect some valid answer.

I need to treat water (24 m3/day on the average and 1.5 m3/h as peak) in order to remove iron ions. Actual iron concentration is 10 ppm, and I need to bring concentration down below 0.1 ppm. A vendor proposed me a pyrolusite (essentially MnO2) filled filter. The above material needs to be activated with a chlorination process. As an alternative he proposed a zeolite filled filter, which needs KMnO4 as oxidant agent to be activated.
I would like to know whether anyone has any experience with these kinds of filter and whether of filter and used hydrogen peroxide (35% mass concentration or 130 volumes) instead of potassium permanganate when dealing with zeolite.
Please do not suggest to ask the vendor...... Thanks

 

[bimr]

Iron removal is done all of the time with simple sand filters.

If you have a neutral pH reading, the iron will be in the insoluble Fe+3 form. All you have to do is to run it through a filter.

If the solution is exposed to air, the iron will air oxidize by itself, so you do not need to add an ozidizing agent (chlorine or KMO4).

A zeolite is probably not a good choice to do this. If you add the oxidant to the zeolite, you will also destroy the zeolite.

You are in the water foroum, not the waste forum so I am not going into wastewater.

You can accomplish this iron removal with a small lab unit or a swimmming pool filter.

 

[ione]

bimr,

Thanks a lot for your reply (a star for you).
Test conducted on site is not that precise and it gives the whole amount of iron without any distinction between Fe++ and Fe+++.
I do not have a big chemistry background, anyway oxygen should be the element that transforms bivalent iron to trivalent iron. In a water with a poor oxygen content iron should be present as Fe++.

The pH is 7.5. With such a value of pH, is it possible to be sure iron is present as Fe+++ and so in an insoluble form?

 

[bimr]

The iron oxidation reaction occurs slower at lower pH values. At a pH of 7.5, the oxidation of iron when exposed to air should occur within 15 mniutes.