Removal of dissolved uranium by dead-end nanofiltration: The role of feed characteristics in membrane performance
Paper ID : 1140-MST2015-FULL
Morteza Ghasemi Torkabad *, Alireza Keshtkar, S. Jaber Safdari
Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, AEOI, P.O.Box: 11365-8486, Tehran- Iran
Dead-end filtration equipment was operated to evaluate the performance of three commercially available nanofiltration membranes (PES-2, NF-1, and NF-2) in terms of uranium rejection and permeate flux under a variety of feed solution conditions. The optimum pH for uranium removal using PES-2 was determined to be 6, while for both NF-1 and NF-2, the rejection increased significantly with increase in the pH. Also, the permeate flux of NF-1 and NF-2 membranes first decreased and then maintained constant for NF-1, but a little increase observed for NF-2 as the feed pH increased. As the feed concentration increased from 0.03125 to 1 mM the uranium rejection by PES-2 decreased, while the rejection by NF-1 and NF-2 increased from 57.07 to 78.59% and 62.29 to 98.21%, respectively. Also, the permeate flux of PES-2 was relatively constant, however the permeate flux of NF-1 and NF-2 membranes declined due to decrease in the effective membrane pore size and increase in osmotic pressure. The results showed that the nanofiltration process can be effectively employed for uranium removal from aqueous solutions.
Membrane, Uranium, Nanofiltration, Dead-end filtration, Feed characteristics
Status : Paper Accepted (Poster Presentation)