Fixed Bed Column Study for Removal of Textile Effluent Acid Orange 7 by NaOH Treated Eggshells and Amberlite FPA-98 as Efficient Adsorbents Using Response Surface Methodology

In this work, the application of Amberlite FPA-98 (Amb) and NaOH Treated eggshell (TES) were investigated for the removal of Acid Orange 7 (AO7) from aqueous solution using the continuous method and was optimized using Full Factorial Design (FFD). Fixed bed adsorption has become a frequently used in wastewater treatment processes. The Thomas, Yoon-Nelson, and Adams and Bohart models were analyzed to evaluate the column adsorption performance. The adsorption capacity, rate constant and correlation coefficient associated to each model for column adsorption was calculated and mentioned. The column experimental data were fitted well with Thomas model with coefficients of correlation R-2 >= 0.93 at different conditions but the Yoon-Nelson, and Bohart-Adams model (R-2=0.911), predicted poor performance of fixed-bed column. The effect of various parameters such as flow rate, initial dye concentration, and bed height was modeled by response surface methodology (RSM). The precision of the equation obtained by RSM was confirmed by the analysis of variance (ANOVA) and calculation of correlation coefficient relating the predicted and the experimental values of adsorption efficiency. The results revealed a good agreement between the predicted values, as obtained by full factorial design (FFD) and the experimental values for AO7 (R-2 = 0.987) . The research on modeling adsorption by RSM has been highly developed and The (Amb) and (TES) were shown to be suitable adsorbents for adsorption of AO7 using fixed-bed adsorption column.