The separation and reuse of nitrates in water

摘要

A method of treating ground water, to obtain purified water and a nitrate concentrate, comprises the steps of: subjecting the ground water to a first membrane treatment, to obtain the purified water and relatively concentrated nitrate-containing solution; subjecting the solution to a treatment whereby sparingly-soluble salts are removed; and subjecting the treated solution to a second membrane treatment, to obtain the concentrate. The concentrate may then be treated to give a floc that can be removed in a further membrane treatment step.