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Dielectric Analysis of Dynamic Fouling Behavior on Surface of Polyethersulfone Composite Ultrafiltration Membrane
Ming-liang Luo*,Qing-zhi Wen,Jia-lin Liu,Hong-jian Liu
Author NameAffiliationE-mail
Ming-liang Luo* College of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266555, China yfsailing_wxg@163.com 
Qing-zhi Wen College of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266555, China  
Jia-lin Liu College of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266555, China  
Hong-jian Liu College of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266555, China  
Abstract:
A dielectric analysis model for the fouling layer on the polyethersulfone composite ultrafil-tration (UF) membrane and solution system, which consists of the solution, concentration polarization layer (CPL), and cake layer, was established by virtue of the interfacial polar-ization and the electrostatic field theory. The effect of some important parameters, such as the depth, conductivity of CPL, and cake layer, on the dielectric spectroscopy (or dielectric relaxation properties) of the UF system was discussed by the parameter sensitivity analy-sis and the dielectric measurement. The simulations indicate that the CPL can be created rapidly and the cake layer formation is the dynamic balance process of growth and erosion in the process of UF. The key factor affecting on the dielectric spectrum of UF system is the electrical properties of the CPL and the cake layer. In comparison to the results of dielectric measurement, the simulations indicate that the model proposed in this work is valid and reliable to some degree for describing and explaining the dielectric relaxation phenomenon in UF system. It is very important to further understand the fouling behavior of membrane surface and optimize the controlling techniques of membrane fouling in the process of UF.
Key words:  Interfacial polarization, Cake layer, Dynamic fouling, Ultrafiltration, Dielec-tric relaxation
FundProject:
Dielectric Analysis of Dynamic Fouling Behavior on Surface of Polyethersulfone Composite Ultrafiltration Membrane
罗明良*,温庆志,刘佳林,刘洪见
摘要:
基于界面极化与静电场理论建立了聚醚砜复合超滤膜表面污染层与溶液体系的介电解析模型. 应用参数敏感性分析和介电测量研究了体系中浓差极化层与滤饼层的厚度与电导率对超滤体系介电弛豫的影响机制. 结果表明超滤过程中浓差极化层能快速建立,而滤饼层的形成是一个增长与剥蚀的动态过程;并且浓差极化层与滤饼层的电学性质是影响超滤体系介电谱的关键因素. 比较介电测量与模拟结果证实了建立的超滤体系介电解析模型能够有效可靠地描述与解释超滤体系产生介电驰豫的机制.
关键词:  界面极化,滤饼层,动态污染,超滤,介电弛豫
DOI:10.1088/1674-0068/23/02/241-248
分类号: