Iron removel

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Apart from electro-magnetic and fixed-magnetic removal, what technologies exist to remove iron particles from water?  Note, this is not dissolved iron - it's particles in wash water from cleaning feldspar. 

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12 Answers

  3. Peter Williams .I suggest a method of Bioremediation to remove Iron from water as it flows.Want to offer my patent 

    • Patent no.IN 201811011885 titled BIOREMEDIATION SYSTEMS AND METHODS FOR REMOVING

    DAMAGING HEAVY METALS FROM INDUSTRIAL EFFLUENTS as a Inventor

    As a technology to remove Iron.

  4. Thanks to everyone for these ideas,   Let me explore further and I will be back to you.  One question that comes to mind is the suitability for relatively low flows - about 80 US gallons an hour.  As I say the need is to remove particulate, not dissolved, iron.

    1 Comment

    1. No issue with our system. Just need to have a small tank (tote size or smaller) between our system (Nanobubbles) and the application point. Let me know. Cheers, Louis

  6. As noted by others you have a wide range of solids-liquid separation options available to remove iron particulates from solution.  Your suggestion of magnetic separation is unconventional, but there is a ballasted clarification technology out of Singapore, I believe, that uses an iron ballast and magnetic separation.  I wouldn’t recommend you use the ballast as you wouldn’t be able to separate your iron sludge, but their magnetic separator may be of use.  Dissolved iron removal involves oxidation to produce a precipitate, which you have.  Chemically enhanced gravity separation may work, but it would be as effective as filtration, which is the conventional approach, with or without flocculants aids.  One unusual technology I recommend you consider is the Heron Industries SAF process.  It uses flotation technology that has been around for 100 years in the mining sector and is based on blending a hydrophobic surfactant, as a foam, with the water and floating the solids out.  Completely different from a DAF, as it does not use high pressures or dissolved gas. The company has about 200 industrial applications in the US.  A key advantage is the very small footprint and high solids content of the sludge it skims off the tank.  Because the surfactant that is used is hydrophobic, water drains out of the sludge very quickly - resulting in 15 - 20 percent solids without dewatering equipment.

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  7. Do you have particle size distribution data. We might have an option for the solids. This option will not be specific to just the iron.

  8. Hi Peter, I would suggest the nanobubbles approach (no chemicals!). Our equipment at Nano Gas Environmental creates a lot of nanobubbles per volume (100-700 billion/liter depending on variables). By lowering the water density to 0.96-0.97, you are effectively creating a bigger specific gravity gap between solid particles and water. In our research, the separation is done rather quickly which can have a direct impact on CAPEX. If you need more info, you can reach me at lmorimanno@ngtenergy.com. All the best, Louis

  9. Hi Peter, the hard part is making dissolved iron into particles. The particles should be relatively easy to remove by most conventional solid/liquid separation step depending on the particle's density and size. Typically gravity settling is the lowest cost, the sp gr of your particles is likely quite high, though the particle size can be small. Do you have stable colloidal materials that don't settle easily--use of a coagulant to impair the surface charge can clear that up. If you need pristine product water then a polishing filter may be required. Hope this helps. -Dave

  10. Please try anionic polyacrylamide flocculant. Alternative I have a heavy metal catcher compound which can precipitate heavy metals like in electroplating industry.

  11. Ozone should do it.

    Ozone oxidizes iron from Fe (II) to Ferric Iron Fe(III). Fe (III) hydrolyzes to Fe (OH)3 which precipitates to a solid form which can be filtered. The oxidation reaction requires 0.43 mg of ozone per mg of Fe (II). Excess ozone can be used without negative effect.

  12. Multi-Media Filters are the most well-known solution to remove iron from water. This system is known for its ability to remove iron, turbidity, odors, color, and suspended particles to produce high-quality water. These filters consist of multiple graded membrane layers arranged from largest to smallest in grain size to enable efficient filtration of larger particles followed by smaller particles. When a coagulant is used simultaneously, small particles are joined together to create larger particles that can be more easily filtered out. This process helps to remove iron from water, including particles of up to 10 microns in size. Additionally, Multi-Media filters are a cost-effective solution to remove iron from water.

     

    A Green Sand Filter (GSF) system can be used as direct water filtration to deal with iron (Fe).