固定床中好氧颗粒污泥动态吸附结晶紫染料

针对印染废水色度高,脱色难度大的问题,通过固定床工艺利用灭活的好氧颗粒污泥(AGS)对水中结晶紫(CV)进行动态吸附.通过对固定床高度、CV初始浓度和和流速对穿透曲线的影响进行探讨,采用Thomas模型和BDST模型对动态吸附试验所得数据拟合并获得了相应参数.试验结果表明,随着固定床高度的增加,穿透时间和饱和吸附时间延长;当CV初始浓度和流速增加时,穿透时间和饱和吸附时间急剧缩短.Thomas模型能够很好地描述AGS对CV的动态吸附动力学.当CV浓度为100mg/L,流速为8.3m L/min,固定床高度为20cm时AGS对CV的吸附动力学与Thomas模型拟合程度最好,相关系数为0.9813.BDST模型能准确预测穿透时间,平均误差小于10%.吸附CV染料后AGS可用无水乙醇进行再生.

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 100mg/L, flow rate at 8.3mL/min and fixed bed height at 20cm, 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.