Application of nanofiltration membrane and ethyleneimine oligomer mixture for selective separation of strontium from a simulated nuclear waste solution

Efficient radioactive waste management calls for maximum volume reduction and selective separation of elements from a radioactive waste solution. Ethylenimine (EI) oligomer mixture (Mn = 423), a known complexing agent for strontium and Nanofiltration (NF) membrane (GE Osmonics HL1812T) has been used for selective strontium separation from an aqueous synthetic nuclear waste solution. NF membrane with MWCO of 100-300 Daltons and 0.4 m2 area have the advantages of high retention, low operating pressure and higher permeate flux since their properties lie between RO and UF membranes