Fixed bed column study for the adsorption of crystal violet dye by aerobic granular sludge

The high colority and hard to decolorization were the most important tasks on printing and dyeing waste water. The ability of inactivated aerobic granular sludge (AGS) to adsorb crystal violet (CV) from aqueous solutions using fixed bed column reactor were studied. Column adsorption studies were carried out at different bed heights, initial dye concentrations and flow rate. Column adsorption experimental data and corresponding parameters were obtained by Thomas model and bed depth service time (BDST) model. Results showed that as the height of adsorbent was increasing, breakthrough time and adsorption saturation time became longer. But when the initial dye concentrations and flow rate were increasing, breakthrough time and adsorption saturation time became shorter. Thomas model described column adsorption of CV kinetics well. When concentration of CV at 100 mg/L, flow rate at 8.3mL/min and fixed bed height at 20 cm, Thomas model showed good agreement with the experimental results (R2=0.9813). BDST model could predict breakthrough time accurately and average error were less than ten percent. Desorption of CV from AGS was using Ethyl alcohol absolute. ©, 2015, Chinese Society for Environmental Sciences. All right reserved.