Treatment of High Salinity Low Level Radioactive Wastewater  Containing Uranium and Plutonium by Flocculation

Treatment of low level radioactive wastewater with high salinity by flocculation was studied. The results show that plutonium can be removed effectively in alkaline condition, and that flocculation of uranium can be improved by increasing the dosage as well as decreasing the pH. The pH control is critical to obtaining high removal efficiency of uranium. The removal efficiency of uranium is over 95.5% by adjusting the pH to 6 and adding Fe²⁺ at a dosage of 100 mg/L. Two-step flocculation method was studied. The concentration of uranium after the second flocculation is lower than 10 μg/L by adjusting the pH<7.0 and adding Fe²⁺ at a dosage of about 80 mg/L.