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垫片法对正渗透过程中浓差极化的改善研究

作者：程世营张捍民，杨凤林

单位：大连理工大学环境学院工业生态与环境工程教育部重点实验室，中国辽宁大连 116024

关键词：正渗透；内浓差极化；垫片位置；

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2015,35(1):49-55

摘要：

正渗透过程中存在的浓差极化现象对其实际的水通量运行效果影响显著。本文在不增加能耗的前提下提出了一种简易的垫片法来改善正渗透过程中出现的浓差极化现象。利用这种方法，在正渗透膜活性层朝向原料液的膜取向下，发现垫片安置在汲取液廊道贴紧膜的位置可以最好的减缓稀释内浓差极化，进而显著的提升正渗透的运行效果；此时，以0.5M的NaCl为原料液，而分别以1M、2M、4M的NaCl为汲取液进行批式实验，与未安置垫片的方式相比，水通量分别有2.94 %, 9.0 % 和 12.5 %的提升幅度；另外，还发现当将垫片放置在原料液廊道（远离膜）和汲取液廊道（贴紧膜）时，可以起到同时减缓浓缩外浓差极化(CECP)和稀释内浓差极化(DICP)的效果。

A major barrier to use asymmetric membranes for forward osmosis (FO) process is concentration polarization (CP) which dramatically reduces the real performance of FO. The scope of this study was to provide a simple method of mitigating CP, especially dilutive internal CP, in the absence of additional energy consumption and investigate the impact of spacer location on concentrative external CP and dilutive internal CP which occurred in FO (AL-FW) mode; finally we tried to provide a spacer location that could significantly decrease the adverse effect of CP on FO performance. These findings of the research led the author to the conclusion that in FO mode, placing the spacer in the draw channel with one end connecting the membrane could well mitigate dilutive ICP. Under such conditions when the feed solution was 0.5M NaCl while the draw solution was 1M, 2M and 4M NaCl separately, the average water flux could increase by 2.94 %, 9.0 % and 12.5 % respectively. Besides, placing the spacer in both feed (away from the membrane) and draw channels (in contact with the membrane) could be an acceptable method of decreasing the negative effects of concentrative ECP and dilutive ICP simultaneously.

基金项目：

国家自然科学基金项目(51278079)

作者简介：

张捍民(1973-)，女，教授，博士，博士生导师，研究方向为水污染控制、膜法水处理等，(电话)0411-84706173 (电子邮箱)zhanghm@dlut.edu.cn],

参考文献：

[1] Cath T Y, Childress A E, Elimelech M. Forward osmosis: Principles, applications, and recent developments[J]. Journal of Membrane Science. 2006, 281(1): 70-87.
[2] Chung T, Zhang S, Wang K Y, et al. Forward osmosis processes: yesterday, today and tomorrow[J]. Desalination. 2012, 287: 78-81.
[3] Mccutcheon J R, Elimelech M. Influence of concentrative and dilutive internal concentration polarization on flux behavior in forward osmosis[J]. Journal of Membrane Science. 2006, 284(1): 237-247.
[4] Gu Y, Wang Y, Wei J, et al. Organic fouling of thin-film composite polyamide and cellulose triacetate forward osmosis membranes by oppositely charged macromolecules[J]. Water research. 2013, 47(5): 1867-1874.
[5] Shaffer D L, Yin Yip N, Gilron J, et al. Seawater desalination for agriculture by integrated forward and reverse osmosis: Improved product water quality for potentially less energy[J]. Journal of Membrane Science. 2012.
[6] Alturki A, Mcdonald J, Khan S J, et al. Performance of a novel osmotic membrane bioreactor (OMBR) system: Flux stability and removal of trace organics[J]. Bioresource Technology. 2012, 113: 201-206.
[7] Phuntsho S, Shon H K, Hong S, et al. A novel low energy fertilizer driven forward osmosis desalination for direct fertigation: Evaluating the performance of fertilizer draw solutions[J]. Journal of Membrane Science. 2011, 375(1): 172-181.
[8] Valladares Linares R, Yangali-Quintanilla V, Li Z, et al. NOM and TEP fouling of a forward osmosis (FO) membrane: Foulant identification and cleaning[J]. Journal of Membrane Science. 2012.
[9] Mccutcheon J R, Elimelech M. Modeling water flux in forward osmosis: Implications for improved membrane design[J]. AIChE Journal. 2007, 53(7): 1736-1744.
[10] Tang C Y, She Q, Lay W C, et al. Coupled effects of internal concentration polarization and fouling on flux behavior of forward osmosis membranes during humic acid filtration[J]. Journal of Membrane Science. 2010, 354(1): 123-133.
[11] Gray G T, Mccutcheon J R, Elimelech M. Internal concentration polarization in forward osmosis: role of membrane orientation[J]. DESALINATION. 2006, 197(1-3): 1-8.
[12] Qin J, Sijie C, Maung H O, et al. Experimental studies and modeling on concentration polarization in forward osmosis[J]. Water science and technology. 2010, 61(11): 2897-2904.
[13] Li G, Li X, Liu Y, et al. Forward Osmosis and Concentration Polarization[J]. PROGRESS IN CHEMISTRY. 2010, 22(5): 812-821.
[14] Tan C H, Ng H Y. Revised external and internal concentration polarization models to improve flux prediction in forward osmosis process[J]. DESALINATION. 2013, 309: 125-140.
[15] Wang K Y, Ong R C, Chung T. Double-skinned forward osmosis membranes for reducing internal concentration polarization within the porous sublayer[J]. Industrial & Engineering Chemistry Research. 2010, 49(10): 4824-4831.
[16] Zhang S, Wang K Y, Chung T, et al. Well-constructed cellulose acetate membranes for forward osmosis: minimized internal concentration polarization with an ultra-thin selective layer[J]. Journal of Membrane Science. 2010, 360(1): 522-535.
[17] Arena J T, Mccloskey B, Freeman B D, et al. Surface modification of thin film composite membrane support layers with polydopamine: Enabling use of reverse osmosis membranes in pressure retarded osmosis[J]. JOURNAL OF MEMBRANE SCIENCE. 2011, 375(1-2): 55-62.
[18] Zaman M, Liu H, Xiao H, et al. Hydrophilic modification of polyester fabric by applying nanocrystalline cellulose containing surface finish[J]. CARBOHYDRATE POLYMERS. 2013, 91(2): 560-567.
[19] Auddy K, De S, Dasgupta S. Flux enhancement in nanofiltration of dye solution using turbulent promoters[J]. Separation and purification technology. 2004, 40(1): 31-39.
[20] Hai F I, Yamamoto K, Fukushi K, et al. Fouling resistant compact hollow-fiber module with spacer for submerged membrane bioreactor treating high strength industrial wastewater[J]. Journal of Membrane Science. 2008, 317(1): 34-42.
[21] Willems P, Deen N G, Kemperman A, et al. Use of Particle Imaging Velocimetry to measure liquid velocity profiles in liquid and liquid/gas flows through spacer filled channels[J]. Journal of Membrane Science. 2010, 362(1): 143-153.
[22] Gray G T, Mccutcheon J R, Elimelech M. Internal concentration polarization in forward osmosis: role of membrane orientation[J]. Desalination. 2006, 197(1): 1-8.
[23] Phillip W A, Yong J S, Elimelech M. Reverse draw solute permeation in forward osmosis: modeling and experiments[J]. Environmental science & technology. 2010, 44(13): 5170-5176.
[24] Zhang H, Ma Y, Jiang T, et al. Influence of activated sludge properties on flux behavior in osmosis membrane bioreactor (OMBR)[J]. Journal of Membrane Science. 2012, 390: 270-276.
[25] 一锟, 流体力学. 1990. 流体力学基础[M]. 北京航空航天大学出版社
[26] 徐文熙, 流体力学, 徐文灿, 等. 1989. 粘性流体力学[M]. 北京理工大学出版社.

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