Highlights Catalytic resins Pd/WA30 can exchange nitrites and/or reduce them to nitrogen. The performance of the Pd(2%)/WA30 catalyst in a hybrid process (reaction and ion exchange) proved to be very good. The ammonium concentration generated by nitrites over-reduction never exceeded 0.2 mg/L. A new methodology for regenerating the resin makes it possible to eliminate more than 99 % of the nitrites.
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