Pemodelan matematis pengurangan COD dalam air limbah industri penyamakan kulit secara adsorpsi kontinyu menggunakan abu terbang bagas

The objective of this research was to obtain suitable mathematical model for Chemical Oxygen Demand (COD) removal originated from tannery wastewater using bagasse fly ash in continuous system. In the column experiment, effect of flowrate, concentration of wastewater, and bulk density were studied. Three models: Adams-Bohart, Thomas, and Yan were applied to experimental data to predict the breakthrough curve. The best model was evaluated using correlation coefficients. Yan model was found to give the most accurate to describe dynamic behavior of the column experiment. The best result was obtained at flowrate of 100 mL/min, concentration of 400 mg/L, and bulk density of 61 g/L. The Yan kinetic constant (k ) and the Y adsorption capacity (q ) were 0.3210 mL/mg/min and 17.0947 mg/g respectively and the Y correlation coefficient obtained was 0.9379.