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Modifying ion exchange for combined removal of uranium and radium
Author(s) -
Clifford Dennis,
Zhang Zhihe
Publication year - 1994
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.1994.tb06183.x
Subject(s) - radium , uranium , chemistry , chloride , sodium , radiochemistry , potassium , ion exchange , nuclear chemistry , inorganic chemistry , ion , materials science , metallurgy , organic chemistry
Mixing only a small amount of strong base anion resin with the strong acid cation resin in a conventional water softener results in efficient uranium removal in addition to radium removal. Adding a small amount of strong base anion (SBA) resin to the strong acid cation (SAC) resin in a conventional water softener provides good uranium and radium removal. In tests on a well water containing 25 pCi/L radium and 120 μg/L uranium, a mixed bed containing 10 percent SBA and 90 percent SAC resin provided a product water with less than 1 pCi/L radium and 20 μg/L uranium during cyclic operation with sodium chloride regeneration. Additional tests indicated that too much anion resin or stratified resin beds caused excessive radium and uranium leakage. Also, potassium chloride was a superior regenerant to sodium chloride for elution of radium from the spent resin.