Ultrafiltration removal of U(VI) from contaminated water Original Research Article

Characteristic features of ultrafiltration water treatment and water treatment using ultrafiltration in combination with complexation for water polluted with U(VI) were investigated. Polyethylenimine (PEI) was used as the complexing agent. The relationship of U(VI) removal as a function of pH and the concentration ratio of CPEICU(VI) were also studied. It was shown that if no polyelectrolytes were present, the retention coefficient of U(VI) reached 0.91–0.95 at pH 9.0. If polyethylenimine were used in the concentration ratio of CPEICU(VI) = 4:1, the retention coefficient using a UPM-20 membrane reached 0.999 at the pH range 5–9. The above values were obtained while using branched structure polyethy leneimine with a molecular mass of 60,000. It was shown that the volume flux drops from 24 to 15 μm/s with increasing pH. The addition of the polyelectrolyte insignificantly changed the volume flux.