Removal of nitrate ions acidic wastewater by donnan dialysis involving tabular exchange membranes

Tubular cation - and anion-exchange membranes were used for the Donnan dialysis of acidic wastewater. The membrane material was prepared from polyethylene modified with styrene and divinylbenzene copolymers. The experimental wastewater was a model solution. Its composition and concentration were comparable to those of the wastewater discharged from the manufacture of nitrogenous fertilizers or to the effluent from the washing of nitrocellulose. The treatment method proposed enables both reclamation of water and reuse of nitrates in the form of sodium, or ammonium, salts.