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Direct observation at the microscale of particle deposition during the first stage of the microfiltration process
Journal of Membrane Science ( IF 9.5 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.memsci.2020.117823
Alberto Valencia , Claude Le Men , Christophe Ellero , Christine Lafforgue-Baldas , Philippe Schmitz , Jeffrey F. Morris

Abstract Particle deposition at pore scale during membrane filtration has been studied. A specially designed microfiltration set-up, including a filtration membrane composed of slots alignment, was used to perform in-situ, real time measurements of the particle concentration and cake growth during filtration of spherical latex particles. The approach allows the microscale phenomena to be related to macroscopic features. The measurements were obtained by direct observation from the side, using video imaging. A dedicated image processing code was developed to analyze the filtration imaging; cake growth monitoring as well as particle tracking and velocimetry are performed using this tool. The image analysis combined with pressure measurements allowed a thorough evaluation of system performance, and has proven effective for filtration analysis of more complex suspensions. The membrane geometry was shown to have a pronounced influence on the formation of the first deposited layers, and this effect persists throughout the later cake growth for the model micro-particles.

中文翻译:

在微滤过程的第一阶段直接观察微粒沉积的微观尺度

摘要 研究了膜过滤过程中孔尺度的颗粒沉积。一种专门设计的微过滤装置,包括由狭缝排列组成的过滤膜,用于在球形乳胶颗粒过滤过程中进行颗粒浓度和滤饼生长的原位实时测量。该方法允许微观现象与宏观特征相关。测量值是通过使用视频成像从侧面直接观察获得的。开发了专用的图像处理代码来分析过滤成像;使用此工具执行蛋糕生长监测以及粒子跟踪和测速。图像分析与压力测量相结合,可以对系统性能进行全面评估,并已证明对更复杂的悬浮液的过滤分析是有效的。膜几何形状对第一层沉积层的形成有显着影响,并且这种影响在模型微粒的整个后期滤饼生长过程中持续存在。
更新日期:2020-04-01
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