Solution decontamination method using precipitation and flocculation techniques.

摘要

Heavy metal and/or radioactive contaminants and oxidising agents (I) (H2O2, O3, Cl2, ClO2, KMnO4, MnO2, HNO3, NaOCl, KOCl, Mg(OCl)2, and Ca(OCl)2 are removed from contaminated streams by a method comprising (a) removing (I) by adjusting the pH and/or aerating the stream for 1-24 hr; (b) treating the stream with aq. FeSO4 soln. to reduce and/or ppte. the contaminants; (c) treating the stream with a soln. of a hydroxide (II) to increase the pH to 9-12, so that the pptes. the contaminants and/or the Fe (II) ions form co-pptes, with the (II) ion which are insoluble, (d) treating the stream with a flocculant (III); and (e) sepg. the co-pptes. step (a) is effected prior to step (b) and (c).