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|Title:||D2EHPA based strontium removal from strongly alkaline nuclear waste|
|Authors:||Kocherginsky, N.M. |
|Keywords:||Alkaline nuclear waster|
Bulk liquid membrane
Hindrance effect of EDTA
|Source:||Kocherginsky, N.M.,Zhang, Y.K.,Stucki, J.W. (2002-09-10). D2EHPA based strontium removal from strongly alkaline nuclear waste. Desalination 144 (1-3) : 267-272. ScholarBank@NUS Repository. https://doi.org/10.1016/S0011-9164(02)00326-0|
|Abstract:||A method for Sr removal from strong alkaline solutions in the presence of 1 M NaOH and 3M NaNO3 has been developed. The method is based on Di-2-ethyl hexyl phosphoric acid (D2EHPA) acting as a carrier in liquid membrane or as an extractant in simultaneous extraction-reextraction. After removal, Sr can be precipitated as SrSO4 if H2SO4 is used as the stripping phase, thus giving the possibility to concentrate radioactive Sr in a small volume of solid phase within one technological step. Using this method in a bulk liquid membrane process without EDTA, a rate of Sr removal near 10-6 mol-m-2-s-1 could be achieved, which is typical for liquid membranes. The hindrance effect of EDTA on the Sr removal has been demonstrated and a simple method to reduce this effect by addition of Ca2+ is suggested. In the case of the extraction-reextraction process with the membrane based demulsification, 98% of Sr was removed at a rate of 4.5x10-9 mol-s-1-L-1. The process is simple and should allow removal of all radioactive Sr from radioactive waste at the Hanford site, USA, in one to two years, depending on the plant scale.|
|Appears in Collections:||Staff Publications|
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