Abstract
Numerical simulation method for the dynamics of fixed-bed column systems is necessary for the safe and economic operation of the contaminated water treatment facilities in Fukushima Daiichi Nuclear Power Station. A two-phase homogeneous diffusion model (TPHDM) is one of the common models for the fixed-bed system simulation. Although breakthrough curve of the column with IE-96 zeolite was successfully calculated with TPHDM, reasonable breakthrough curve was not calculated when the column system equipped with a Crystalline Silicotitanates (CST) was simulated. This implied the necessity to improve TPHDM by modeling the phenomena not yet considered. It is known that electric double layer (EDL) is formed around the porous particle such as zeolite when it is in contact with liquid phase. Hence, a new kinetic model was developed where the effect of adsorption in EDL is explicitly modelled by introducing a new region for EDL between bulk and macropore regions. EDL works as a capacitor and its capacity was explicitly treated by defining a parameter f which is a ratio of the capacity of the capacitor to the total adsorption capacity of the adsorbent. The value of f was determined by the best fit approach. Consequently, the calculated breakthrough curves of the CSTcolumn and IE-96 column was in good accordance with experimental result.
