S.C. PIELOREX S.A.;S.C. PRODSTEFANO S.R.L;S.C. TARO INDUSTRY S.A.;PRO COMOD SHOES SRL4th International Conference on Advanced Materials and Systems, ICAMS 2012 -- 27 September 2012 through 29 September 2012 -- Bucharest -- 100613The separation of uranyl ions from dilute solutions can be realized by a facilitated transport using a carrier, dissolved in an membrane. This process was realized by emulsion liquid membranes technique and is a solution to a problem of environmental pollution. By this method, aqueous solutions containing uranyl ions in the range 2-10 mg/L were extracted and concentration reduced to under 0,4 mg/L, so that these solutions can be delivered to surface waters. The inverted emulsions used in extractions were obtained by stirring equal volumes of organic phase and aqueous stripping solution containing NaHCO3 and Span 80. Liquid membranes containing mobile complexing agents have been widely studied in the form of inverted emulsions known as emulsion liquid membranes (ELM). The present work is original because presents the possibility of using ELM method to separate the uranyl ions UO22+ from dilute solutions and waste waters. By dispersing the inverted emulsion Water/Oil in the phase source, a liquid membrane is realized between the two phases, source and receiving solution. In conclusion it was demonstrated the possibility of applying the ELM technique using ammonium quaternary salts as carrier to remove the uranyl ions from waste waters with high extractions yields (85-90%)
