Ion exchange distribution coefficients for {sup 137}Cs and {sup 99}Tc removal from Hanford tank supernatants AW-101 (Envelope A) and AN-107 (Envelope C)

Abstract

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

“…by Kurath et al (1999) Kurath et al (1999) Kurath et al (1999) Kurath et al (1999) Schwartz and Smith (1953 Liles and Geankoplis (1960) . Batch specific binary isotherm models (batch # 981015DHC720011 & 990420DHC720067) are plotted................................................................105 Figure 9-3.…”

“…(6-1) are labeled in Figure 6-1 and listed in Table 6-1. The data from this sieve analysis and from other batches that are available (e.g., see Kurath et al, 1999), in general are very coarse. As Figure 6-1 points out, too much weight is given to the upper sieve range resulting in overestimation of the mean particle radius.…”

“…Ideally, pore diffusion coefficients can be derived from batch kinetics distribution studies where the mass transfer resistance associated with film diffusion is minimized through significant mechanical mixing (note that, mixing techniques must be limited such that physical grinding of the particles does not become excessive). A time-dependent technetium distribution study was performed in simulated DSSF waste by Kurath et al, 1999. Batch kinetics tests, where inadequate mixing is achieved between the solid and solution, result in overall diffusion coefficients that are in effect smaller than the actual pore diffusion coefficient. Therefore, the use of the batch kinetics data taken by Kurath et al (1999) can provide us with a lower bound estimate of pore diffusion, while molecular diffusion becomes our upper bound.…”

Small Column Ion Exchange Testing of Superlig 644 for Removal of 137Cs from Hanford Tank Waste Envelope A (Tank 241-AW-101)

“…The Battelie values at room temperature and at 85°C are duplicated from Kurath, et al, 1999, while all of the SRTC data is reproduced from (Hassan, et al, 1999). The F factor is the ratio of the dry mass of exchanger to the initial mass of the exchanger.…”

“…The particle size distribution for the as-received SL-644 resin subsample (Kurath, et al, 1999) is compared to the subsample used in column experiments by SRTC (Hass~et al, 1999) in Table 2.2. It is apparent that the average particle size of the Battelle subsarnple is smaller than that of the SRTC subsample.…”