通过调整挤出头尺寸,制备出不同壁厚的聚四氟乙烯(PTFE)中空纤维膜.采用浸没式真空膜蒸馏(SVMD),研究了膜丝壁厚、操作条件、NaCl浓度等对产水通量和脱盐率的影响.结果表明,降低膜壁厚度可增加产水通量;提高料液温度和冷侧真空度可明显提高产水通量;曝气亦可提高产水通量,当曝气量超过6 m3/(m2·h)时,产水通量反而下降.连续运行800 h的实验表明,产水通量随工作时间的延长而减小,200 h后趋于稳定,脱盐率可保持在99.6%以上.
参考文献
[1] | Mohammadali Safavi;Toraj Mohammadi .High-salinity water desalination using VMD[J].Chemical engineering journal,2009(1/3):191-195. |
[2] | Na Tang;Qian Jia;Huanju Zhang .Preparation and morphological characterization of narrow pore size distributed polypropylene hydrophobic membranes for vacuum membrane distillation via thermally induced phase separation[J].Desalination: The International Journal on the Science and Technology of Desalting and Water Purification,2010(1/3):27-36. |
[3] | Bing Wua;Xiaoyao Tan;K.Li .Removal of 1,1,1-trichloroethane from water using a polyvinylidene fluoride hollow fiber membrane module: Vacuum membrane distillation operation[J].Separation and Purification Technology,2006(2):301-309. |
[4] | Sharmiza Adnan;Manh Hoang;Huanting Wang.Commercial PTFE membranes for membrane distillation application: Effect of microstructure and support material[J].Desalination: The International Journal on the Science and Technology of Desalting and Water Purification,2012:297-308. |
[5] | 张华鹏,朱海霖,王峰,郭玉海.聚四氟乙烯中空纤维膜的制备[J].膜科学与技术,2013(01):17-21. |
[6] | Ariawan A B .Paste extrusion of polytetrafluoroethylene fine powder resins[D].Doctoral Thesis,University of British Columbia,2001. |
[7] | Gryta M;Tomaszewska M;Grzechulska J et al.Membrane distillation of NaCl solution containing natural organic matter[J].Journal of Membrane Science,2001,181:279-287. |
[8] | 武春瑞,郝福锦,贾悦,吕晓龙,蹇锡高.PVDF中空纤维疏水膜的鼓气吸收法海水提溴性能研究[J].功能材料,2009(09):1563-1566,1569. |
[9] | Schofield R W;Fane A G;Fell G J D .Gas and vapour transport through microporous membranes.I.Knudsen-Poiseuille transition[J].Journal of Membrane Science,1990,53:159-171. |
[10] | Jean-Pierre Mericq;Stephanie Laborie;Corinne Cabassud .Vacuum membrane distillation of seawater reverse osmosis brines[J].Water research: A journal of the international water association,2010(18):5260-5273. |
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