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IRON REMOVAL - GREEN FLOC

IRON REMOVAL - GREEN FLOC

IRON REMOVAL - GREEN FLOC

(OP)
When raising the pH of ground water with high fe2+ concentration of 47ppm, using NaOH or Lime, a green floc is produced - if the water is aerated first, the floc is brown?

Both situations result in iron removal but I am curoius as to what is actually happening?

Regards

RE: IRON REMOVAL - GREEN FLOC

Aeration oxidizes the Fe+2(green) to Fe+3(rust-color). The Fe+3 has lower solubility, so you can get more complete removal as Fe(OH)3.

RE: IRON REMOVAL - GREEN FLOC

(OP)
Thanks for the response.
What would produce a better result - aerate the water before raising the pH with NaOH or
- should I add the NaOH and then aerate.

RE: IRON REMOVAL - GREEN FLOC

In principle, it is better aerate first.
If instead you add NaOH first, more of it will be wasted by reacting with CO2.

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