Electroless nickel wastewater treatment

I am engineering student and I am looking for a form to give to treatment to the water of remainder of a line of electroless nickel, as well as to the bath that already expired its time of life. I have reviewed inverse osmosis, evaporation, ionic interchange and carbamates.

Electroless nickel bath becomes spent after a few turnovers. This is mainly because of the build-up of the oxidation products following oxidation of the reducing agents used in these baths.

Pumping the spent solution to a separate tank, addition of alkali or alkaline earth metal salts to precipitate the oxidation product, removal by filtration, adjustment of the bath constituent to the desired level and re-use is one option.

Electrodialysis is another useful method.