Ozone should do it. Ozone ...

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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.