Tailoring Inorganic Sorbents for SRS Strontium and Actinide Separations: Optimized Monosodium Titanate Phase Ii Final Report

RADIUM AND THORIUM SORPTION BY MONOSODIUM TITANATE (MST) AND MODIFIED MST (mMST)

“…The performance of MST and mMST in the removal of the Sr and actinides in this test set is consistent with that measured in prior testing. 9 mMST removes 85 Sr and Pu more rapidly and to a greater extent (at these time scales) than MST. The Np removal by MST and mMST is similar through 24 hours of contact; however, MST reaches slightly higher DFs at the later time points.…”

Decontamination Factors and Filtration Flux Impact to Arp at Reduced MST Concentration

“…As shown previously, sorbate removal (i.e., DF value) decreases upon a decrease in the MST concentration. [9][10][11][12] There have been several experimental data sets that have measured the performance of MST at a concentration of 0.2 g/L with salt solutions having sodium concentrations ranging between 4.5 M and 7.5 M. [9][10][11][12][13] These tests were carried out at 25 + 3 °C, which is very similar to the temperature range specified for ARP operations. Table 3-2 provides the initial sorbate and sodium concentrations for each of the test solutions used in these experiments.…”

Optimized Monosodium Titanate Phase Ii Supplemental Testing Report Uranium Adsorption and Shelf-Life Measurements

“…Upon addition of increasing amounts of MST, the uranium concentration rapidly decreases until below the quantifiable limit at sorbent concentrations at or above 7.6 g L - 1 . Thus, at the higher MST concentrations (7.6 and 9.4 g L -1 ) more than 99.5% of the uranium was removed by sorption onto the MST.…”

“…1 The modified MST (mMST) is a member of the larger family of peroxotitanate materials referred to as amorphous peroxotitanate (APT). 2 The improved actinide removal performance of the mMST and APT materials offers the potential for increased throughput performance for the Actinide Removal Process (ARP), Salt Waste Processing Facility (SWPF) and Enhanced Process for Radionuclide Removal (EPRR).…”