A Two-Stage Batch Adsorption Optimised Design for Basic Blue 69 Dye Removal to Minimum Contact Time Yu-Ting Feng1#, Pei-Yu Lin1, Ming-Huang Wang1, I-Hsin Lin1 and Yuh-Shan Ho2* 1School of Public Health, Taipei Medical University 2Bibliometric Centre, Taipei Medical University - Wan-Fang Hospital Introduction In some cases, a single-stage batch adsorber cannot achieve the high levels of dye removal specified but which can be readily achieved using an optimized two-stage batch adsorber design. The cost and performance of product/equipment/system or the mode of application are always to control the process efficiency. This study investigates the adsorption of Basic Blue 69 onto wood and develops a two-stage batch adsorber design model. A design analysis method was developed to predict the percentage of Basic Blue 69 removal at various times of contact for a fixed mass of wood. The model minimizes the total contact time to achieve a fixed percentage of phenol removal using a fixed mass of wood. Materials and Methods A 0.1 g sample of wood (500±710 m) was added to each 50 ml volume of BB69 dye solution. The initial concentrations of BB69 dye solution tested were 50, 100 and 200 mg/dm3. Samples were withdrawn at suitable time intervals, filtered through a filter paper and then analysed with UV. Figure 1. Pseudo-second order sorption kinetics of BB69 onto wood at various initial concentrations Batch Adsorber Design Pseudo-second-order kinetic model Mass balance equation Table 1. Parameters for effect of initial concentration on the BB69/wood system Figure 3. Minimum contact time for various percentage BB69 removal in a two-stage process Figure 2: Comparison of 90% BB69 removal time of each stage in two-stage BB69/wood process Conclusions The design model presented is based on a pseudo-second-order kinetic model, and this has been used for minimizing the reaction time used in a two-stage contact system that operating cost would be reduced. The model has been optimized with respect to contact in order to minimize total contact time to achieve a fixed percentage of BB69 dye removal using a fixed mass of wood.