Hanford Tank 241-C-106: Impact of Cement Reactions on Release of Contaminants from Residual Waste Page: 16 of 177
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In late 2003, sludge from tank C-106 was further removed using a 0.9 M oxalic acid solution to
dissolve and suspend the solids and pump out as much as possible. The goal was to lower the sludge
volume from about 68,137 to 10,599 L (18,000 to 2,800 gal [360 ft3]). This goal was achieved by several
additions and removals of the oxalic acid solution. After the final removal, the sludge was rinsed with
water to remove as much of the acid solution as possible. Approximately 151,416 L (40,000 gal) or
35.5 cm (14 in.) of water was added to measure the sludge volume, and then as much liquid as possible
was removed. A 0.5-M NaOH solution was added to neutralize the residual waste, and then removed.
The residual liquid in the tank was sampled for analysis through Riser 14 (Figure 1.2), and multiple
sludge samples were acquired using a clamshell device by CH2M HILL Hanford Group, Inc. (CH2M
HILL) in January 2004. All samples were delivered to the Hanford 222-S Laboratory for processing and
characterization. Figure 1.3 is a picture of the sludge at the 222-S Laboratory. Subsamples were sent to
Pacific Northwest National Laboratory (PNNL) for testing and release model development.I - M
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Figure 1.3. Tank C-106 Sludge at 222-S Laboratory
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Deutsch, William J.; Krupka, Kenneth M.; Lindberg, Michael J.; Cantrell, Kirk J.; Brown, Christopher F. & Schaef, Herbert T. Hanford Tank 241-C-106: Impact of Cement Reactions on Release of Contaminants from Residual Waste, report, September 1, 2006; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc887933/m1/16/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.