Iron Removal Setup

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We installed ​an iron ​removal filter ​system and need to know if the setup is correct. We have the ​feed of 10.000 ​l, but in ​the outlet ​we get ​only 3.000 l. The feed water ​pH is 7 and the ​treated water ​pH is 9.5.The ​system ​components are ​set in the ​following order:​ 

  1. Filter feed pump 
  2. Iron removal filter 
  3. Pressure sand filter
  4. Activated ​carbon ​filter  ​
  5. Chlorine ​disinfection ​system  ​

Is this setup ​correct or not? ​  ​

The iron ​removal filter (​IRF) has the ​pressure of 5 ​bar and ​activated ​carbon filter (​ACF) outlet has ​the pressure of ​1 bar. ​

Why ​is there such a ​high pH ​difference? ​

Please explain ​and give advice ​about our ​system ​setup and what ​changes need to ​be made. ​

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11 Answers

  2. For Iron Removal, you could use Manganese green sand Filter and keep the free chlorine in 0.5-1.0 ppm in range for self regeneration. Chlorine for High pH >8.5 will not effective nor work, its will additional as OCl- not as HOCL, if want to make desinfectant in high pH you must use Bromine based.

  4. You set-up is right in a general sense. However, as mentioned, there are other parameters to be addressed: 1. alkalinity must be high enough; 2. pH should be higher; 3. flow rate vs. equipment size must be assessed; 4. oxidant level(s) must be sufficient based on water chemistry. What is the function of your carbon filter?

  5. soluble iron in water can be removed by diffused aeration, followed by settling, filtration and then chlorination.

  6. It would be good to know the hydraulic flow rate you are treating and the iron removal filter size and type (i.e. manganese greensand, DMI-65, etc.). As with all media filtration processes, filtration speed and loading rates are critical to achieving adequate filter performance. Ozone is particularly effective in oxidising iron and is far more economical as far as long term operating costs when compared to liquid chlorine for oxidation purposes. Following oxidation with ozone, iron can be easily removed with media filtration. Filter rates of

  8. It would be helpful to know what the "iron removal filter" is. If it is Mn02 based media (greensand or pyrolusite) then the chlorine must be dosed before the iron removal filter. The chlorine is very capable of oxidizing the iron effectively prior to filtration. If the "iron removal filter" is not chlorine compatible then move your chlorine injection to up stream of the sand filter. 

    Most likely you have ferris iron leaving the iron filter, going to the end of the treatment. It may then oxidize once you add chlorine and give you additional ferric precipitation. 

    The downside to this is that you would need to re-inject  chlorine after the carbon for a residual. If the carbon is not being used for DOC, T/O or VOC's you may simply be able to eliminate it but i would need more water quality information.

  9. The process needs some modifications. If the iron concentration is high, above 1,000.00 ppm, a precipitation with alkaline solution is required, after filtration and removal of iron (iron hydroxide) and filtration of activated carbon. About pH, the same is being altered due to the disinfection process performed with chlorine, which is alkaline. The pH must be adjusted with acid solution. This is our suggestion, as it will be necessary to perform a pilot test in the laboratory, and then proceed to the practical execution in the treatment plant.

  10. Dear  K.M.Senthil kumar ,

    " Remember that all good iron filters should have water of at least 7.5 pH or higher to work properly. Some, such Filters, often need a pH of at least 8.0. ALL oxidizing filters need at least a pH of 7.5 or higher. The pH of 7 or below the iron removal unit will not be work properly and adverse effect. There is almost always serious drawbacks with lower pH water when using iron filters.

    1. The sequence of the treatment is ok. The inlet pH is 7 then why treatment required ?, you can bypass some step like iron removal, I think this is the problem of iron removal unit, because the This  Iron Removal Filter  Cartridge contains the same media (Permanganate Treated Zeolite) employed in many expensive iron water filtration systems, When the dissolved iron comes in contact with the manganese greensand media, it is rapidly oxidized, turning the ferrous iron into a ferric form which is then mechanically filtered and removed from the water. When the iron water filter has reached the end of its service life, it is simply replaced with a new cartridge - there is no media to regenerate, no backwashing, your iron removal system is not working and my suggestion some time you pass this unit then analyse the PH.
    2. Check the line corrosion.
    3. Pump & pump line material.
    4. If heavy metal present then reflect the inlet pH.
    5. So there is no outside problem it is the problem of within system

    Regards

    Prem Baboo

     

  11. Bonjour 

    La problématique de la fonction séparatrice du filtre entraine systèmatiquement le colmatage et la putréfaction.

    Le fer comme les métaux lourds se déposent au fond des réservoirs.

    Hello The problem of the separator function of the trained systematically filter clogging and rot.

    The railway as heavy metals are deposited at the bottom of the tanks.

     

    1 Comment

    1. You have not mentioned the size of the iron removal filter. The filter velocity is important as with all media filtration processes. In lieu of any catalytic media based iron removal filtration processes, ozone is particularly effective for iron oxidation, and once oxidised media filtration followed by carbon filtration to remove permanganate formed as a result of ozone reacting with any manganese present is all that I required. Ozone is significantly cheaper for long term operational costs when compared to chlorine dosing. Media filter rates of