The Impact of Pesticides - Academy Publish

Fig.4. Breakthrough curves of isoproturon removal by granular activated carbonpacked columns using Yoon-Nelson model of a) different initial concentrations (bedweight = 0.2 g, initial, flow rate = 1.0 mL.min -1 ), b) different flow rates (bed weight= 0.2 g, initial isoproturon conc. = 100.0 µg.L -1 ).Fig. 4 (a-b) show the experimental and theoretical breakthrough curves obtained atdifferent concentrations and flow rates using Yoon-Nelson model. Fig 4 and the datain Table 6 indicated that the values as predicted from the Yoon-Nelson model arepredicted relatively well to the experimental results.The Wolborska ModelFor the determination of the fit of the Wolborska model, not linearized form of Eq(4) was applied to the experimental data. The kinetic coefficients of mass transfer aswell as the bed capacity (N 0 ) were determined from this Equation. Table 7 showsthe values obtained along of MPSD and SE values. In general, there is no good fit inN 0 values between experimental and theoretical data obtained.Table 7. Predicted parameters for Wolborska model and model deviations forisoproturon adsorption on activated carbon.C 0(g.L -1 )Q(mL.min -1 )Z(cm)(h -1 )N 0 exp(mg.g -1 )N 0 cal(mg.g -1 )MPSD50 69 1.0 2.0 0.04 16.51 0.0021 88.63 2.25150 67 1.0 2.0 0.03 16.75 0.0036 42.33 3.35100 63 2.0 2.0 0.06 19.97 0.0032 253.58 2.80100 68 3.0 2.0 0.05 13.69 0.0041 60.74 2.35SEIn Fig. 5 (a-b) is shown the experimental and theoretical breakthrough curvesobtained at different operating conditions for Wolborska model.AcademyPublish.org - The Impact of Pesticides348