Model for Sr-Cs-Ca-Mg-Na ion-exchange equilibria on chabazite

Journal Article · Fri Oct 01 04:00:00 EDT 1993 · AIChE Journal (American Institute of Chemical Engineers); (United States)

DOI:https://doi.org/10.1002/aic.690391015· OSTI ID:5893902

Perona, J J ^[1]

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1. Oak Ridge National Lab., TN (United States)

Chabazite zeolites are used at Oak Ridge National Laboratory to decontaminate wastewaters containing [sup 90]Sr and [sup 137]Cs. Treatability studies show that chabazite can remove trace amounts of these nuclides from wastewaters containing much higher concentrations of calcium and magnesium. The design of ion-exchange columns for multicomponent systems requires a method for predicting multicomponent equilibria from binary, ternary and quaternary experiments, since the number of experiments required for an empirical equilibrium modes is not generally feasible. Binary interaction parameters for the Wilson equation are used to predict solid-phase activity coefficients for the five-component system. The sum of squares of deviations between experimental and predicted solution concentrations for the data points available is calculated. The average deviation per data point for the five-component system is lower than for some of the ternary- and four-component data sets containing calcium or magnesium.

• OSTI ID: 5893902
• Journal Information: AIChE Journal (American Institute of Chemical Engineers); (United States), Journal Name: AIChE Journal (American Institute of Chemical Engineers); (United States) Vol. 39:10; ISSN 0001-1541; ISSN AICEAC
• Country of Publication: United States
• Language: English

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