Abstract
Present paper reports removal of radiocesium from low level waste using a modified sorbent (13X-CFC) prepared by in-situ precipitation of potassium copper hexacyanoferrate(II) inside the macropores of a synthetic zeolite. The Cs exchange isotherm of the sorbent is established and it found to follow Fruendlich absorption isotherm equation. It is varified that presence of hexacyanoferrate on zeolite facilitates rapid Cs uptake performance. This is further confirmed in laboratory scale column tests, wherein excellent Cs removal performance from low level waste simulant was observed even at higher flow rates (40 bed volumes per hour). The utility of the sorbent is established through successful demonstration in a pilot scale (50 L) trial with almost complete removal of 137Cs from more than 14,000 bed volumes of actual low level waste. The sorbent, owing to its low cost and excellent 137Cs removal performance, is expected to find application in treatment of very low active waste streams.
Acknowledgement
Authors thank Messrs R.S. Mahadik, B.N. Pisal and S. Tiwari for preparation of the sorbent during their on job training at PSDD laboratory.
References
1 Classification of radioactive waste, AERB Safety guide, AERB/NRF/SG/RW-1 (2011).Search in Google Scholar
2 Raj, K., Prasad, K. K., Bansal, N. K.: Radioactive waste management practices in India. Nucl. Engin. Design. 236, 914 (2006).10.1016/j.nucengdes.2005.09.036Search in Google Scholar
3 Sinha, P. K., Amalraj, R. V., Krishnasamy, V.: Flocculation studies on freshly precipitated copper ferrocyanide for the removal of caesium from radioactive liquid waste. Waste Manag. 13, 341 (1993).10.1016/0956-053X(93)90063-3Search in Google Scholar
4 Vincent, T., Vincent, C., Guibal, E.: Immobilization of metal hexacyanoferrate ion-exchangers for the synthesis of metal ion sorbents – a mini-review. Molecules 20, 20582 (2015).10.3390/molecules201119718Search in Google Scholar
5 Haas, P. A.: A review of information on ferrocyanide solids for removal of cesium from solutions, Sep. Sci.Technol. 28, 2479 (1993).Search in Google Scholar
6 Tusa, E. H., Paavola, A., Harjula, R., Lehto, J.: Industrial scale removal of Cesium with hexacyanoferrate exchanger - process realization and test run. Nucl. Technol. 107, 279 (1994).10.13182/NT94-A35008Search in Google Scholar
7 Technical report series N0 408: Application of ion exchange process for the treatment of radioactive waste and management of spent ion-exchangers. International Atomic Energy Agency, Vienna (2002).Search in Google Scholar
8 Chen, R., Tanaka, H., Kawamoto, T., Asai, M., Fukushima, C., Na, H., Kurihara, M., Watanabe, M., Arisaka, M., Nankawa, T.: Selective removal of cesium ions from wastewater using copper hexacyanoferrate nanofilms in an electrochemical system. Electrochimica Acta 87, 119 (2013).10.1016/j.electacta.2012.08.124Search in Google Scholar
9 Terada, K., Hayakawa, H., Sawada, K., Kiba, T.: Silica gel as a support for inorganic ion- exchangers for the determination of caesium-137 in natural waters. Talanta 17, 955 (1970).10.1016/0039-9140(70)80138-2Search in Google Scholar
10 Sangvanich, T., Sukwarotwat, V., Wiacek, R. J., Grudzien, R. M., Fryxell, G. E., Addleman, R. S., Timchalk, C., Yantasee, W.: Selective capture of cesium and thallium from natural waters and simulated wastes with copper ferrocyanide function-alized mesoporous silica. J. Hazard. Mater. 182, 225 (2010).10.1016/j.jhazmat.2010.06.019Search in Google Scholar PubMed PubMed Central
11 Lalhmunsiama, C. L., Tiwari, D., Lee, S. M.: Immobilized nickel hexacyanoferrate on activated carbons for efficient attenuation of radio toxic Cs(I) from aqueous solutions. Appl. Surf. Sci. 321, 275 (2014).10.1016/j.apsusc.2014.09.200Search in Google Scholar
12 Rao, S. V. S., Narasimhan, S. V., Lal, K. B.: Composite CFC-PU foam ion-exchanger in the removal radio active cesium-pilot plant scale studies using simulated and actual plant waste. J. Radioanal. Nucl. Chem. 256, 137 (2003).10.1023/A:1023320613966Search in Google Scholar
13 Rao, S. V. S., Lekshmi, R., Mani, A. G. S., Sinha, P. K.: Treatment of low level radioactive liquid wastes using composite ion-exchange resins based on polyurethane foam. J. Radioanal. Nucl. Chem. 283, 379 (2010).10.1007/s10967-009-0377-zSearch in Google Scholar
14 Mimura, H., Kimura, M., Akiba, K., Onodera, Y.: Selective removal of cesium from sodium nitrate solutions by potassium nickel hexacyanoferrate-loaded chabazites, Sep. Sci. Technol. 34, 17 (1999).Search in Google Scholar
15 Borai, E. H., Harjula, R., Malinen, L., Paajanen, A.: Efficient removal of cesium from low-level radioactive liquid waste using natural and impregnated zeolite minerals. J. Hazard. Mater. 172, 416 (2009).10.1016/j.jhazmat.2009.07.033Search in Google Scholar PubMed
16 Nakai, T., Wakabayashi, S., Mimura, H., Niibori, Y., Tanigawa, H., Ishizaki, E., Kurosaki, F., Matsukura, M.: Evaluation of adsorption properties for Cs and Sr selective adsorbents-13171, WM2013 Conference, February 24–28 (2013), Phoenix, Arizona, USA.Search in Google Scholar
17 Valsala, T. P., Roy, S. C., Shah, J. G., Gabriel, J., Raj, K., Venugopal, V.: Removal of radioactive cesium from low level radioactive waste (LLW) streams using cobalt ferrocyanide impregnated organic anion exchanger. J. Hazard. Mater. 166, 1148 (2009).10.1016/j.jhazmat.2008.12.019Search in Google Scholar PubMed
18 Faghihian, H., Iravani, M., Moayed, M., Maragheh, M. G.: Preparation of a novel PAN–zeolite nanocomposite for removal of Cs+ and Sr2+ from aqueous solutions: Kinetic, equilibrium, and thermodynamic studies. Chem. Eng. J. 222, 41 (2013).10.1016/j.cej.2013.02.035Search in Google Scholar
19 Banerjee, D., Samanta, S. K.: “Process chemistry and resin performance in the treatment of alkaline intermediate level waste by selective ion exchange”, Proceedings of 14th Annual Conference of Indian Nuclear Sociaty and 1st BRNS Conference on Nuclear Fuel Cycle, Indira Gandhi Centre for Atomic Research, Kalpakkam, December 17–19 (2003).Search in Google Scholar
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