We designed a treatment plant ...

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We designed a treatment plant for removing Al, Fe, and Mn.  Both Al and Fe precipitate at 7 - 8 as hydroxides, but Mn needs pH 10.5 - 11.  So be careful, as pH is critical with different metals.

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Thanks Ivan, I just have the following question:

 1) So did you only do pH manipulation followed by filtration?

 2) what was the reaction time required for the precipitation to occur?

 3) What concentrations of Aluminium were you dealing with?

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