The regeneration method of zirconium hydroxide sorbent spent in the boron sorption process by diluted solution of acids as well as the principle recycling diagram of the formed regenerating solution by the nanofiltration process with the OPMN-P membrane were proposedin this work. The permeate obtained can be used as a boron-containing microfertilizer (ammonium salt + boron) after it has been neutralised with ammonium hydroxide. Zirconium-containing concentrate may be reused for sorbent preparation. The effectiveness of separation of the regenerating solution componentsby nanofiltration is demonstrated by high values of zirconium rejection coefficient in this process (RZr ~98– 99%) and low values of boron rejection coefficient (RB ~12%). In this case the specific performance of the membrane is about50 dm3/m2·h.

DOI: https://doi.org/10.3846/aainz.2017.020