粉末活性炭处理反渗透浓水的吸附模型

粉末活性炭（PAC）可显著吸附去除反渗透（RO）浓水中的COD和UV254,使其能够达标排放或进一步资源化。首先通过正交实验选择主要吸附影响因素及其水平范围,再通过单因素实验确定COD和UV254的吸附等温线和吸附动力学方程,最后通过响应曲面法（RSM）实验建立了去除COD和UV254的吸附模型,模型中以PAC投量和吸附时间为自变量。当PAC投量为0.9g.L-1、吸附时间为50min时,COD和UV254的RSM模型预测去除率分别为69.7%和82.4%,实测去除率分别为65.3%和81.8%。可见,RSM模型在设计范围内较好的预测了COD和UV254的去除率,能为工程实践提供全面可靠的数据基础。

Adsorption Model of Reverse Osmosis Concentrate Treatment by Powdered Activated Carbon

COD and UV254 of concentrate from reverse osmosis（RO） are removed significantly by powdered activated carbon（PAC） adsorption,which makes the effluent meet the related discharged standard or further reclamation demand.First,main adsorption factors and their levels were selected through orthogonal experiments.Then adsorption isotherms and adsorption kinetics equations about COD and UV254 were obtained by single factor experiments.Finally,adsorption model of COD and UV254 removal were established via response surface methodology（RSM） experiments,in which PAC dosage and adsorption time were acted as independent variables.COD and UV254 predictive removal of RSM model were 69.7% and 82.4% respectively,and the corresponding measured values were 65.3% and 81.8% when the PAC dosage was 0.9 g·L-1 and adsorption time was 50 min.It is shown RSM models can predict COD and UV254 removal very well in the design range,which provides a comprehensive and reliable data basis for engineering application.