Preliminary Ion Exchange Modeling for Removal of Technetium from Hanford Waste Using SuperLig 639 Resin

Determination of Perrhenate Adsorption Kinetics From Hanford Waste Simulants Using Superling 639 Resin

“…Large variability has been observed and reported by Hamm et al (2000a and2000b) in the existing K d databases (which consist of complied data from IBC, PNNL, and SRTC). This data was obtained from traditional batch contact testing for both SuperLig  644 and SuperLig  639…”

“…Based on prior information about the adsorption isotherm (see Hamm et al, 2000b), nitrate is the predominate competitor for perrhenate and the true equilibrium loading levels will depend strongly on the nitrate-to-perrhenate ratio. For the three simulants tested, the approximate nitrate-to-perrhenate ratios varied significantly (i.e., 19,800 for AN-105, 2,700 for AZ-102, and 81,500 for AN-107).…”

“…However, the diffusional properties of these two species in solution are known to be quite similar (Rard, 1991, Reid et al, 1977, Perry, 1973. Modeling efforts have demonstrated that simulant tests conducted with perrhenate ion can be utilized to predict resin performance with actual samples containing pertechnetate ion (Hamm et al, 2000b) after correction for the differences in loading levels between these two species.…”

The Role of Liquid Waste Pretreatment Technologies in Solving the Doe Clean-Up Mission

“…In addition to laboratory-scale column tests, chemical and radiation stability testing of SuperLig ® 639 resin have been conducted. SRNL personnel have also developed a preliminary ion exchange model that contains information useful for design and operation of a technetium ion exchange process using SuperLig ® 639 resin [Hamm 2000]. …”

Intermediate-Scale Ion Exchange Removal of Cesium and Technetium from Hanford Tank 241-AN-102

“…1 6 2 and 5. The Cs and Tc distribution coefficients (K d ) and % removal were calculated using the formulas shown in Eqs.…”