Strontium and Actinide Sorption by MST and MMST Under Conditions Revelant to the Small Column Ion-Exchange Process

Investigating Suspension of Mst, Cst, and Simulated Sludge Slurries in a Pilot-Scale Waste Tank

“…The bench-scale testing saw a similar trend with the measured soluble strontium concentration being 0.86 mg/L versus a target concentration of 6 mg/L. 7 Following the MST addition, strontium quickly decreases in concentration, and it reaches steady-state within 6 -12 hours. Subsequent strikes show reduced starting strontium concentrations, due to the MST heel in the tank and carbon dioxide sorption that leads to additional carbonate in the tank.…”

Desorption of Sorbates From Mst, Mmst, and CST Under Various Conditions

“…1 The composition of this simulant, SWS-5-2010, is provided in Table 2-1. For the CST experiments, a non-rad simulant was prepared having a similar chemical composition to SWS-5-2010, with the exception of the radioactive components.…”

“…The bottles were transferred to a 25 °C shaker oven, and were shaken at a speed of 175 rpm. Samples were removed at the following times: 1,4,8,14,22,28,37, and 43 days. The samples were removed and filtered through a 0.1-μm filter, and an aliquot of the filtrate was acidified with an equal volume of 5 M HNO 3 .…”

“…1 These samples consisted of MST and mMST, which had been contacted with a radioactive simulated salt solution, SWS-5-2010, for 20 weeks. The Sr and actinide sorption test occurred during the first six weeks of this time period, during which the bottles were being shaken in a waterbath shaker.…”

“…1 After the leak occurred, the tubing was replaced and the tests were continued. After this leak occurred, the sorbate concentrations in solution began increasing as opposed to decreasing or remaining constant as expected.…”