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Mathematical modelling of the sorption dynamics of radionuclides by natural clinoptilolite in permeable reactive barriers

Published online by Cambridge University Press:  09 July 2018

V. A. Nikashina*
Affiliation:
Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academy of Sciences, Kosygin str. 19, Moscow 119991, Russia
I. B. Serova
Affiliation:
Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academy of Sciences, Kosygin str. 19, Moscow 119991, Russia
E. M. Kats
Affiliation:
Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academy of Sciences, Kosygin str. 19, Moscow 119991, Russia
N. A. Tikhonov
Affiliation:
M.V. Lomonosov Moscow State University, Faculty of Physics, Moscow, Russia
M. G. Tokmachev
Affiliation:
M.V. Lomonosov Moscow State University, Faculty of Physics, Moscow, Russia
P. G. Novgorodov
Affiliation:
Institute of Oil and Gas Problems, Siberian Branch of Russian Academy of Sciences, Yakutsk, Russia

Abstract

The anthropogenic accidents in the world (including the underground emergency nuclear explosion at the site “Kraton-3” (Yakutiya) and also the recent Fukushima accident) resulted in significant environmental pollution by radionuclides, mainly long-lived 90Sr and 137Cs. One of the ways to solve this problem is the creation of “permeable reactive barriers” (PRBs). High selectivity of clinoptilolite-containing tuffs (CLT) towards Sr2+ and Cs+ radionuclides, together with their availability and reasonable cost, make possible their use as PRBs. The scales of the ion-exchange processes taking place on PRBs indicate the necessity of mathematical modelling. In this connection, Sr2+ and Cs+ ion-exchange sorption on Khonguruu CLT (Yakutiya) from solutions of various mineralizations was studied under equilibrium and non-equilibrium conditions. The physicochemical and mathematical models of the dynamic ion-exchange process and also the computer program considering both structural features of CLT (two-stage particle diffusion kinetics) and possible periodic interruptions of the process were developed. The breakthrough time of CLT as a geochemical barrier was calculated by such mathematical modelling.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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Footnotes

Deceased 2009

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