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Immobilization Index of Liquid LLW in Cementitious Grouts

Published online by Cambridge University Press:  15 February 2011

Sadananda Sahu  and
Sidney Diamond
Sadananda Sahu
Affiliation:
School of Civil Engineering, Purdue University, West Lafayette, IN 47907, [email protected] and [email protected]
Sidney Diamond
Affiliation:
School of Civil Engineering, Purdue University, West Lafayette, IN 47907, [email protected] and [email protected]
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Abstract

The ability of grouts formulated from mixtures of cementitious materials and attapulgite clay to immobilize various chemical species in the projected off-gas waste stream from vitrification of Hanford low level tank wastes was studied. Three different solid blends were evaluated, with cement :fly ash : slag clay weight ratios of 3:3:3:1, 3:0:6:1, and 0:0:9:1. The blended solids were mixed with a simulated low level liquid waste solution containing Na+, NO2-, NO3-, PO43- and OH- ions, in the proportion of 1 liter of solution to 1 kg of solid blend, and were cured either at 22°C (room temperature), 50°C or 90°C. Pore solutions were expressed at various ages and were analyzed to determine the reductions in concentrations of the individual ionic species. The results were expressed in the form of immobilization index (I) calculated for each species. The immobilization indices for Na+ (I Na+ ) and for OH- (IOH-)were similar in each case, and were found to be highest when only slag and clay was present (blend 0:0:9:1). The immobilization index for phosphate, , was 1 in all cases, i.e. phosphate was completely removed from solution. On the other hand removal of NO2- and NO3- ions was generally ineffective.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 412: Symposium V – Scientific Basis for Nuclear Waste Management XIX , 1995 , 419
Copyright
Copyright © Materials Research Society 1996

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References

1. Brodersen, K., Berghman, K., Glasser, F. P., Longomazino, N., Nomine, J. C., and Wang, J., Radioactive Waste Management and Disposal, edited by Ceclle, L., (Elsevier Applied Sciences, Amsterdam, 1991), p. 242.Google Scholar
2. Glasser, F. P., Cement and Concrete Research 22, p. 201 (1992).Google Scholar
3. Lee, D. J. and Fenton, A. in Stabilization and Solidification of Hazardous Radioactive and Mixed Wastes, edited by Gilliam, T. M. and Wiles, C. C., (American Society for Testing and Materials, 2nd Volume, ASTM STP 1123, Philadelphia, 1992) p. 348.Google Scholar
4. Serene, R. J., Lokken, R. O. and Criscenti, L. J., Waste Management 12, p. 271 (1992).Google Scholar
5. Holland, T. R. and Lee, D. J., Cem. and Concr. Res. 22, p. 247 (1992).Google Scholar
6. Sahu, S. and Diamond, S., “Pore solution chemistry of simulated low level liquid waste incorporated cement grouts” in Scientific Basis for Nuclear Waste Management XIX, edited by Murphy, W. M. and Knecht, D. A. (Mater. Res. Soc. Proc., Pittsburgh, PA, 1996) in press.Google Scholar
7. Barneyback, R. S. Jr. and Diamond, S., Cem. and Concr. Res. 11, p. 279 (1992).Google Scholar
8. Taylor, H.F.W., Cement Chemistry, I st. ed., p. 247 (Academic Press, London, 1990).Google Scholar
9. Bonen, D., et al. “Solidfication/stabilization of simulated alkaline nonvitrifiable low level radioactive waste by early formation of carbonate bearing AFm phases” in Scientific Basis for Nuclear Waste Management XIX, edited by Murphy, W. M. and Knecht, D. A. (Mater. Res. Soc. Proc., Pittsburgh, PA, 1996) in press.Google Scholar