Adsorption : Dynamic And Dynamic Adsorption Process Design And Optimization Of Operating Conditions

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Adsorption Colum dynamic studies In general, the most of the adsorption processes are classified into static and dynamic adsorption based on their mode of operation. With dynamic adsorption the adsorbate solution is in continuous contact with the adsorbent packed in a fixed bed column. Therefore, the understanding of the column dynamics behavior is essential to predict the performance of adsorptive separations in the column for process design and optimization of operating conditions. (M1,M4, I8, P3) The performance of the packed bed column is evaluated through the concept of breakthrough curve (M3,I7, P2), which is indicative of the transient behavior of concentration profile as function of time for any defined changes in column parameters…show more content…
The BDST curves obtained by plotting ln(Co/Ct -1) against t were used to calculate the values of adsorption capacity, No and the rate constant, ka from the slope and intercept of the linear plots. Table 3 presents the estimated values of the characteristic parameters, No and ka along with the correlation regression coefficient (R2) of the respective BDST plots. The decrease in values of ka were observed with increasing bed height and influent Cd(II) concentration, while increased with increasing flow rates. The values of rate constant, ka greatly influences the shape of the breakthrough curve in a packed bed column study.(Y4) With higher ka values the breakthrough can be avoided using lower bed height, whereas as the ka values decreases the progressively longer bed heights are required to eliminate the breakthrough. (A1) Further, the No values were increased with increasing bed height and influent Cd(II) concentration. This behavior can be attributed to the increased contact time of Cd(II) ions with the biochar as the bed height increased (A3) while with increasing influent concentration provided the higher loading of Cd(II) ions to saturate the biochar in a short period of contact (T1). As in case with increased flow rate, the No values were decreased which is indicative of more saturation of adsorbent sites. (Y1) These findings suggest that the overall adsorption

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