Abstract:
Approximately 4.3 kg of slurry from Hanford Tank AZ-101 were evaluated by the pretreatment processes of cross-flow filtration, washing, caustic leaching, and rinsing. The filterability was measured with a 0.1-μm sintered metal filter using a single-element, cross-flow filtration system. During testing, the permeate flux and slurry axial velocity, pressure, and temperature were monitored every 10min. The slurry temperature was maintained at 25°C ± 5°C, except during the elevated-teniperature leaching step. The test results show that cross-flow filtration provides excellent separation of solids and liquids, as evidenced by the permeate flux and the measured activity of nearly insoluble 241Am. The average permeate flux measured was higher than the Waste Treatment Plant target of 0.014 gpm/ft2, and the average decontamination factor for 241Am was 985,000 during testing.