The extraction behavior of several metal ions viz., Am 3+, Eu 3+, UO22+, Th 4+, Sr 2+ and Cs + was investigated from sulphate medium employing phosphotungstic acid (PTA) and polyethylene glycol (PEG). The influence of various parameters such as pH, PTA concentration, PEG concentration and salt concentration was studied. The order of extraction followed the trend: Am3+>Eu3+>>Th4+>UOz2+>Sr2+>Cs + which deviate significantly from the reported order with conventional solvents. The relatively poor extraction of UO22+, Sr 2+ and Cs + was ascribed to their lack of interaction with the phosphotungstate anion. The separation behaviour of Am 3+ vis-a-vis Eu 3+ was also investigated under different experimental conditions.
AbstractPresent paper reports removal of radiocesium from low level waste using a modified sorbent (13X-CFC) prepared by in-situ precipitation of potassium copper hexacyanoferrate(II) inside the macropores of a synthetic zeolite. The Cs exchange isotherm of the sorbent is established and it found to follow Fruendlich absorption isotherm equation. It is varified that presence of hexacyanoferrate on zeolite facilitates rapid Cs uptake performance. This is further confirmed in laboratory scale column tests, wherein excellent Cs removal performance from low level waste simulant was observed even at higher flow rates (40 bed volumes per hour). The utility of the sorbent is established through successful demonstration in a pilot scale (50 L) trial with almost complete removal of
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