Environmental protection by the adsorptive elimination of acetaminophen from water: A comprehensive review

In this work, the mathematical modeling of acetaminophen (ACT) removal in a fixed-bed adsorption column using sugarcane bagasse (SB) as adsorbent was studied. Experimental data were fitted to six analytical models: Thomas, modified dose-response, Yoon-Nelson, Bohart-Adams, Wang, and Wolborska. Three experimental tests were carried out at 2.5 mL/min of flow rate, 57 mg/L of ACT concentration, and bed heights of 23, 33, and 43 cm. The predicted breakthrough curve by modified dose-response model agreed acceptably (R2 > 0.91) with experimental curves. Besides, a computational fluid dynamic (CFD) model was developed to simulate and analyze the ACT concentration inside of the adsorption column and the wall channeling effect. The simulated breakthrough curve had a good reproducibility with experimental data, the maximum error between experimental and predicted points was 7.03%. In addition, the CFD model shows a high mass transfer zone and a slow adsorption rate in all three tests of ACT adsorption; the mass transfer zone grew as the bed height increased, whereas the wall channeling effects disappeared with increasing bed height. Also, the diffusion resistances and axial dispersion phenomenon were relevant. The results of this research work demonstrate the usefulness of computational fluid dynamics analysis to understand better the adsorption process.

Modeling and computational fluid dynamic simulation of acetaminophen adsorption using sugarcane bagasse

Promising adsorptive materials derived from agricultural and industrial wastes for antibiotic removal: A comprehensive review

Mathematical modeling and numerical simulation of sulfamethoxazole adsorption onto sugarcane bagasse in a fixed-bed column.

Acetaminophen removal by calcium alginate/activated hydrochar composite beads: Batch and fixed-bed studies.

http://dspace.ucuenca.edu.ec/bitstream/123456789/35382/1/documento.pdf

Comparison of the adsorption capacity of acetaminophen on sugarcane bagasse and corn cob by dynamic simulation

The scaling up of adsorption columns is a crucial step toward the removal of emerging pollutants from domestic and industrial wastewaters. In this study, a fixed-bed column to remove sulfamethoxazole packed with sugarcane bagasse was scaled up from laboratory (DL = 2.2 cm) to pilot unit (DP = 4.4 cm) using a scaling factor (K = 2). In addition to the basic similarity rules for scaling, three new criteria were proposed for the mass adsorbent, flow rate, and bed volume. Then, three lab-scale tests at flow rate of 5 mL/min and bed heights of 15, 25, and 35 cm were transferred to the pilot-scale column at flow rate of 20 mL/min and bed heights of 30, 50, and 70 cm, respectively. The breakthrough curves and the fixed-bed parameters (residence time tR, saturation time ts, adsorption capacity qe, volume of solution treated Vef, and removal percentage %R) obtained in both scales were compared to define their effect with the increase of scale. Finally, a mechanistic model was proposed to predict the breakthrough curves in both columns. The results exhibited that the breakthrough curves in the pilot-scale prolonged in time with higher breakthrough and saturation times than the laboratory breakthrough data. Additionally, tR, ts, and Vef changed in function of the K value used: ts and tR doubled their value in the pilot column or tRP=KtRL; Vef was eight times higher in the pilot column than the lab-column or VefP=K3VefL; qe and %R remained constant in both scales; these results were corroborated with the predicted breakthrough curves. Besides, the mechanistic model predicted with great precision the breakthrough data in both scales (R2>0.9), which means that the model can be used confidently for scaling up purposes. This study demonstrated new criteria which can be easily applied to scale up adsorption columns whit results that showed a correlation between both scales. 

A new approach for scaling up fixed-bed adsorption columns for aqueous systems: a case of antibiotic removal on natural adsorbent

http://dspace.ucuenca.edu.ec/bitstream/123456789/37311/1/documento.pdf

Diego Juela

Papers

Modeling and computational fluid dynamic simulation of acetaminophen adsorption using sugarcane bagasse

Mathematical modeling and numerical simulation of sulfamethoxazole adsorption onto sugarcane bagasse in a fixed-bed column.

Comparison of the adsorption capacity of acetaminophen on sugarcane bagasse and corn cob by dynamic simulation

A new approach for scaling up fixed-bed adsorption columns for aqueous systems: a case of antibiotic removal on natural adsorbent

Adsorption properties of sugarcane bagasse and corn cob for the sulfamethoxazole removal in a fixed-bed column