Abstract
Abstract The present study investigated the dynamics of manganese adsorption onto bone char in a continuous fixed bed column using a mathematical model that incorporates: (i) the backmixing model to describe the fluid flow through the bed and (ii) the shrinking core model to describe the kinetic and mass transfer phenomena within spherical adsorbent particles. The proposed model consists of an ordinary differential equation system. Hydrodynamic, kinetic and diffusive parameters were determined by fitting the mathematical model to the experimental data obtained by Sicupira et al. (2015). For the operating conditions evaluated in this study, the intraparticle diffusion represented the controlling step of the adsorption process (Bim> 3.8). The increase in the feed rate of the column (3.0-7.5 mL min-1) and the decrease in the height of the bed (8-16 cm) resulted in a decrease in the time required for the saturation of the column bed. The model is flexible for a variety of flow conditions and adequately reproduced the behavior of the manganese adsorption process in the fixed bed column operation (R²> 0.99) with an average percentage error less than15%.
Highlights
The concern for environmental protection and the maintenance of public health has stimulated industries to invest massively in treating their wastewaters
The model incorporates two mathematical approaches: (i) the backmixing model to describe the fluid flow within the fixed bed column and (ii) the shrinking core model (Levenspiel, 1999; Arévalo et al, 1997), which proved adequate to reproduce batch experimental data for manganese adsorption onto bone char (Maria and Mansur, 2016)
The experimental data obtained by Sicupira et al (2015) for the adsorption of manganese onto bone char in fixed bed columns were used to evaluate the accuracy of the model developed in this work
Summary
The concern for environmental protection and the maintenance of public health has stimulated industries to invest massively in treating their wastewaters. The model incorporates two mathematical approaches: (i) the backmixing model to describe the fluid flow within the fixed bed column and (ii) the shrinking core model (Levenspiel, 1999; Arévalo et al, 1997), which proved adequate to reproduce batch experimental data for manganese adsorption onto bone char (Maria and Mansur, 2016).
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