Washing Demonstration using Nonradioactive Simulated Tank 7 Sludge-Slurry Page: 4 of 13
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Nonradioactive simulated Tank 7 sludge-slurry was prepared from washed Tank 8
nonradioactive simulant used for Sludge Receipt and Adjustment Tank (SRAT) experiments'.
The washed Tank 8 simulant was dewashed, and sodium oxalate, sand, and coal were added.
See Appendix A for Tank 8 simulant composition and chemicals added to dewash the simulant.
Washing the Tank 7 Dewashed Simulant
Two separate sludge washing experiments were completed: a small scale (5 g of sludge-slurry)
experiment utilizing a centrifuge prior to each decant, and a larger scale (100 mL of sludge-
slurry) experiment where the sludge was allowed to gravity settle. All tests were conducted at
For the centrifuge tube washes, 5 g of sludge slurry were placed into a 10 mL glass centrifuge
tube. The sludge-slurry was washed ten times. Each wash consisted of:
" an addition of 5 g of inhibited water:
" mixing well
" allowing the mixture to settle overnight
" centrifuging to make decanting easier
" decanting approximately 5 g of supernate with a slurry pipette.
The decanted supernates were submitted to SRTC Analytical Development Section (ADS) and to
the SRTC Mobile Lab for cation analysis by Inductively Coupled Plasma-Emission
Spectroscopy (ICP-ES) and anion analysis by Ion Chromatography (IC).
For the larger scale washes, 100 mL of sludge slurry were placed into a 250 mL polycarbonate
bottle. The sludge-slurry was washed ten times. Each wash consisted of
" an addition of 100 mL of inhibited water
" mixing well
" allowing the sludge to settle for at least two days to allow decanting of 100 mL supernate
" decanting approximately 100 mL of supernate with a slurry pipette.
The densities of the decanted supernates were measured using a 2 mL (nominal) Gay-Lussac
bottle. The supernates were then submitted to SRTC-ADS for cation analysis by ICP-ES and
anion analysis by IC.
: The inhibited water had a sodium concentration of 0.03 M, nitrite concentration of 0.015 M, and hydroxide
concentration of 0.015 M.
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Pareizs, J.M. Washing Demonstration using Nonradioactive Simulated Tank 7 Sludge-Slurry, report, February 10, 2003; South Carolina. (digital.library.unt.edu/ark:/67531/metadc737374/m1/4/: accessed June 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.