Torkamanzadeh Mohammad, Jahanshahi Mohsen, Peyravi Majid, Shokuhi Rad Ali
Membrane Research Group, Nanotechnology Research Institute, Babol University of Technology, P.O. Box 484, Babol, Iran E-mail:
Department of Chemical Engineering, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran.
Water Sci Technol. 2016 Dec;74(12):2737-2750. doi: 10.2166/wst.2016.352.
Determination of fouling mechanisms and accurate quantitative prediction of nano-porous membrane behavior are of great interest in membrane processes. This work has focused on a comprehensive comparison of two classical and new fouling models. Different operational conditions were tested to analyze the level of agreement of these models with experimental observation. Whey solutions of 8, 0.8 and 0.5 g/L were ultrafiltered in transmembrane pressures (TMPs) of 300 and 500 KPa through a synthesized polyethersulfone/copolymer blend membrane. Fouling mechanisms and the effect of different combinations of TMPs and protein concentrations were determined and analyzed by fitting the experimental data to different models. Based on the results obtained from classical models, it was found that the predictions of the cake layer formation model were quite acceptable, followed by the intermediate blocking model. The new combined pore blockage-cake filtration model, however, was found to be very successful in predicting the flux decline over time for every operational condition tested, with all relative errors of prediction less than 5%. The latter also showed a good performance in the transition from the pore blockage mechanism to cake layer formation.
确定污垢形成机制并准确地对纳米多孔膜行为进行定量预测，在膜过程中具有重大意义。这项工作着重对两种经典污垢模型和新污垢模型进行全面比较。通过测试不同的操作条件，来分析这些模型与实验观测结果的吻合程度。将8、0.8和0.5 g/L的乳清溶液在300和500 KPa的跨膜压力下，通过合成的聚醚砜/共聚物共混膜进行超滤。通过将实验数据拟合到不同模型，确定并分析了污垢形成机制以及跨膜压力和蛋白质浓度不同组合的影响。基于经典模型获得的结果发现，滤饼层形成模型的预测结果相当不错，其次是中间堵塞模型。然而，新的孔堵塞-滤饼过滤组合模型在预测所测试的每个操作条件下通量随时间的下降方面非常成功，所有预测的相对误差均小于5%。后者在从孔堵塞机制到滤饼层形成的转变过程中也表现良好。
