Chapter 21

About Mathematical Modeling and Calculation of Dynamic Ion- Exchange Processes on Natural Zeolites

Valentina A. Nikashina

Abstract

Сlinoptilolite-containing tuffs as ion-exchangers play an important role in water decontamination. The shortest scientifically grounded way to determine the optimal conditions or to forecast the results of ion-exchange processes lies in the mathematical modeling of both sorption and regeneration stages. The theory of the ion-exchange dynamics has been developed and used for modeling and calculation of technological tasks on ion-exchange resins. A bank of solutions for the dynamic ion-exchange tasks was created in the Laboratory of Sorption Methods of the Vernadsky Institute. The ion exchange on natural zeolites – clinoptilolites is characterized by a number of specific features, particularly, two-stage particle diffusion kinetics. The possibilities for using available solutions of sorption dynamics for modeling and calculation of the ion-exchange processes on natural zeolites were estimated. It was shown that the use of available solutions is possible if the sorption of target components is described by linear or nearly linear isotherms. The actual examples of application of known theoretical solutions of the sorption dynamics for modeling and calculating of ion exchange processes on natural clinoptilolites are presented in this article. The breakthrough times of some technological filters loaded with clinoptilolite are also calculated.

Total Pages: 453-472 (20)

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