Multiple Ion Exchange Column Tests for Technetium Removal from Hanford Tank Waste Supernate Page: 4 of 39
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The River Protection Project -Waste Treatment Plant (RPP-WTP) is contracted by
the United States Department of Energy (DOE) to develop, build, and operate a high
level nuclear waste treatment facility at the Hanford Site in Richland, Washington. At
this site, millions of gallons of high-level and low-level radioactive waste are stored in
underground storage tanks. A large portion of the waste exists as liquid solution
(supernatant) and it contains soluble radionuclides, such as mCs (t12 = 30 y), 99Tc (t12 =
2.13 x 105 y), and 90Sr (t12 = 30 y). Technetium, as TcO4, is highly soluble in water and
readily mobile in the environment (1, 2). This mobility, along with its long half-life
makes technetium primarily a long-term hazard. Removal of 99Tc from the bulk waste is
required to produce a low activity waste (LAW) that can be vitrified into low-level waste
glass. The separated 99Tc is concentrated into a relatively small volume and incorporated
into high-level waste sludge. This sludge is vitrified into high-level waste (HLW) glass
logs suitable for permanent disposal in a federal repository.
The RPP-WTP project identified ion exchange as the optimal treatment method
for removal of 99Tc from the Hanford waste solutions. Anion exchange using SuperLig*
639 resin from IBC Advanced Technologies, American Fork, Utah, was selected to
remove 99Tc from the waste solutions. The resin, which is supported on polystyrene
beads and covalently bonded crown ether ligands remove technetium as a ligand-NaTcO4
complex (3). Extensive experimental investigations conducted at Savannah River
Technology Center (SRTC) and at Battelle, Pacific Northwest National Laboratory
(PNNL) with actual waste samples from Tanks 241-AW-101, 241-AN-103, 241-AN-102,
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Hassan, N.M. Multiple Ion Exchange Column Tests for Technetium Removal from Hanford Tank Waste Supernate, article, February 27, 2004; South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc786432/m1/4/: accessed March 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.