In natural water Mg is always ...
Published by Bas Heijman, Associate professor at Delft University of Technology
In natural water Mg is always present as Mg2+ and cannot be further oxidised. May be you are confusing it with the removal of manganese which is in reduced form in natural waters and should be oxidised to form MnO2 which is a solid. Mg2+ can be partly complexed by the natural organic matter in the water but it contributes together with Ca2+ to the hardness of the water. If you concentrate hard water in an NF or an RO this will cause scaling. So probably this is the reason for the low recovery in the NF. You can increase the recovery by: 1) acid dosing 2) antiscalant dosing 3) removing multivalent positive ions before the NF by IEX