Abstract: A method for removing and recovering ammonium and/or potassium and/or phosphate ions from wastewater is presented which comprises:permitting said wastewater to pass through at least one bed of ion-exchange resins capable of removing selectively those nutrient ionsregenerating those ion-exchange resins with a Na Cl solution or other suitable regenerant solutions so that said nutrient ions may be obtained in a much more concentrated formadding to said regeneration eluates (or, eventually, directly to wastewater) at least one Mg salt, in proper pH conditions so as to precipitate hydrous MgNH.sub.4 PO.sub.4 and/or MgKPO.sub.4, slightly soluble salts of great agronomic value.