How slug flow can improve ultrafiltration flux in organic hollow fibres |
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| Institution: | 1. Laboratoire d''Ingénierie des Procédés de l''Environnement, Institut National Des Sciences Appliquees, Département de Génie des Procédés Industriels, Complexe Scientifique de Rangueil, 31077 - Toulouse Cedex, France;2. Centre International de Recherche sur l''Eau et l''Environnement, Avenue du Président Wilson, 7230 Le Pecq, France;1. Department of Agrochemistry and Environment, Miguel Hernández University of Elche, Avda. Universidad, s/n, 03202 Elche, Alicante, Spain;2. Lab/ Group Mats. Vítreos y Cerámicos, CSIC-IETcc, c/Serrano Galvache 4, 28033 Madrid, Spain;1. Key Laboratory for Robot and Intelligent Technology of Shandong Province, College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, PR China;2. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, PR China;1. Key Laboratory of Coal Science and Technology of Shanxi Province and Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China;2. College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;1. Department of Chemical and Petroleum Engineering, Sharif University of Technology, PO Box 11155-9465, Azadi Avenue, Tehran, Iran;2. Faculty of Chemistry, Kharazmi University, Tehran, Iran;1. Sabanci University Nanotechnology Research and Application Center, Orta Mahalle, 34956 Tuzla, Istanbul, Turkey;2. Facutly of Engineering and Natural Science, Sabanci University, Orhanli, 34956 Tuzla, Istanbul, Turkey;1. Department of Physics, Karunya University, Coimbatore 641 114, India;2. Department of Nanoscience and Technology, Karunya University, Coimbatore 641 114, India |
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| Abstract: | The study deals with the use of a gas-liquid two-phase flow to reduce particle membrane fouling in organic hollow fibres by injecting air directly into the feed stream. A theoretical approach of slug flow in fibres demonstrates that the slugs created inside the fibres induce high wall shear stresses. Moreover, the membrane surface is alternately submitted to positive and negative shear stresses. This succession of stresses is expected to prevent filtered particles from settling on the membrane surface and then enhance the ultrafiltration mass transfer. Experiments were carried out with clay suspensions in hollow fibre membrane. A range of various air velocities and particle concentrations was examined and the effect of a steady gas flow was compared to that of an intermittent one. As expected, the injecting air process leads to an increase of the permeate flux by up to 110% for Ug=1 m s−1 (flux multiplied by 2.1), for all the various concentrations studied. Furthermore, even at a low air velocity a significant enhancement can be achieved (+60% for Ug=0.1 m s−1, flux multiplied by 1.6). An intermittent gas flow seems to be less effective than a steady one in similar experimental conditions. |
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