矿化垃圾固定床吸附过程和穿透曲线预测

以轴向扩散模型和恒定图式假设为基础,推导出了适用于预测固定床穿透曲线的积分模型.通过动态循环法对苯酚和对氯苯酚在矿化垃圾中的吸附行为进行了研究,采用Freundlich等温吸附方程描述穿透曲线,并得到了便于应用的代数模型.通过不同条件下固定床实验来确认模型,结果证实模型可以很好地描述穿透曲线.同时讨论了操作参数和矿化垃圾特性对穿透曲线的影响,结果表明,较低的进料浓度和进科流量以及内扩散和轴向扩散的影响都会造成实际穿透曲线与预测穿透曲线之间的偏差.

Adsorption of phenols on an aged-refuse fixed-bed and models for prediction of breakthrough curves

Adsorption of phenol and 4-chlorophenol by an aged-refuse fixed bed was studied using dynamic circulation. The corresponding integral model for prediction of the breakthrough curves was developed based on the axial diffusion model and constant-pattern wave approach theory. The Freundlich model was adopted to describe the breakthrough curves and an algebraic model was thus established. Fixed-bed tests were performed under different conditions to verify the model and the results showed that the model described the breakthrough curves well. The effects of the operating parameters and the characteristics of the aged-refuse on the breakthrough curves are also discussed. The differences between the observed and predicted curves of the effluents indicate that the developed models may be contributed to the lower feed flow rate and concentration,intraparticle diffusion of phenol in the aged-refuse,and axial diffusion of phenol.