Purificn. of effluent water contg. complexed metal ions

摘要

Purificn of effluent water contg. metal ions complexed with organic complex formers, comprises (a) charging an anion exchanger with an anion which does not form a complex or forms a weaker complex with the complex former than the metal ion. (b) leading the effluent water into the charged anion exchanger so that a leading and a trailing zone are formed. In the effluent water used (c) the metal ions are complexed by organic complex formers of medium complexing power and (d) leading in of the water is terminated at latest at breakthrough of the trailing zone.