Adsorption of Synthetic Dye by Betel Nuts Activated Carbon in a Fixed-bed Column, Experiments and Prediction of Breakthrough Curves

Wastewater produced from textile industry contains synthetic dye that couldn't degrade naturally. The dye waste adsorbed in a continuous fixed-bed column by betel nuts activated carbon. The fixed-bed column had 60 cm of height and 2 inches of ID. The synthetic dye solution fed to the top of column with flow 10 ml/min. The column performance was evaluated with varying bed height in 5,10, and 15 cm. The outlet analyzed using UV-Vis spectrophotometer. The increased of bed height indicated longer of breakthrough time and column life. The 15 cm of bed height result column maximum capacity (qexp), % total removal, and total adsorbed dye solute (qtotal) in the amount of 21.99 mg/g, 68.17%, dan 3299.62 g respectively. The prediction of breakthrough curve has been done using kinetic adsorption study the of Thomas, Yoon-Nelson, Adam Bohart, and Bed Depth Service Time (BDST) model. The result of the experiment indicates the kinetic model of Thomas and Yoon-Nelson are the fit models, with the coefficients of regression (R2) are 0.98 and 0.95 at the bed heights of 10 and 5cm.