高浓度NaCl溶液真空膜蒸馏传递阻力分布的研究
作者:游文婷,董哲勤,张觅,许振良
单位: 华东理工大学化学工程研究所膜科学与工程研发中心,上海 200237
关键词: 真空膜蒸馏;传递阻力分布;浓缩;膜污染
分类号: TQ028. 8
出版年,卷(期):页码: 2014,34(6):1-5

摘要:
对纯水体系以及NaCl溶液浓缩过程中真空膜蒸馏传递阻力的分布进行了研究,考察了操作条件对传递阻力分布的影响,分析了传递阻力在浓缩过程的变化原因。结果表明:在纯水体系下,温度和膜表面流速对膜阻力影响较小,其值在162 ~ 164.7 Pa·h·m2/kg范围内变化;边界层阻力受操作条件影响较大,较低的流量和较高的料液温度导致较高的边界层阻力。在NaCl溶液浓缩过程中,渗透通量随浓缩时间起先呈缓慢下降趋势,传递阻力以边界层阻力和膜阻力为主,当料液浓度超过临界值时,渗透通量发生骤降,污染层阻力骤升,膜表面发生结晶污染。但利用清水冲洗受污染膜后,渗透通量恢复率95%左右。因此,控制浓缩终点的浓度低于临界点浓度将有效避免膜污染的形成。
 Vacuum membrane distillation process (VMD) was carried out on the pure water system and the NaCl solution concentration process, respectively. The transfer resistances of VMD were studied. In pure water system, the effect of both feed temperature and feed flow rate on membrane resistance could be avoided. The value of membrane resistance was ranged in 162 ~ 164.7 Pa·h·m2/kg. However, a lower feed flow rate and a higher feed temperature could lead to a higher boundary layer resistance. The permeate flux decreased gradually and the membrane fouling resistance increased slightly, when the solution was concentrated up to a critical point in the NaCl solution concentration process. The crystallization fouling was occurred, while the concentration was beyond the critical point. The recovery of permeate flux could reach about 95% by fresh water flushing. Therefore, the membrane fouling could be avoided efficiently by controlling the determining concentration below the critical point

基金项目:
上海市科技攻关计划(11DZ1205201和1351102000)和江苏省科技工业支撑计划(BE2013031)。

作者简介:
游文婷(1985-),女,上海人,华东理工大学硕博连读研究生,主要从事膜法水处理的研究工作

参考文献:
 [1].El-Bourawi M S,Ding Z,Ma R,Khayet M.A framework for better understanding membrane distillation separation process[J].Journal of Membrane Science,2006,285(1-2):4-29 
[2].吕海莉,田瑞,杨晓宏,马淑娟.用于膜蒸馏苦咸水淡化的PTFE疏水膜实验研究[J].膜科学与技术,2012,32(1):70-74
[3].Zakrzewska-Trznadel G,Harasimowicz M,Chmielewski A G.Membrane processes in nuclear technology—application for liquid radioactive waste treatment [J].Separation and Purification Technology,2001,22-23:617-625 
[4].徐军,李睿,王连军,李建生,孙秀云.真空膜蒸馏分离苯/N-甲酰吗啉水溶液体系微分模型[J].膜科学与技术,2010, 30(5):52-58
[5].王亚飞,张红漫,程丽华,张林,陈欢林.膜蒸馏浓缩纤维素糖液与去除糠醛的研究[J].膜科学与技术,2012, 32(5):92-96
[6].Curcio E,Criscuoli A,Drioli E.Membrane Crystallizers [J].Industrial & Engineering Chemistry Research,2001,40:2679-2684
[7].Gryta M.Direct contact membrane distillation with crystallization applied to NaCl solutions [J].Chemical Papers,2002,56(1):14-19
[8].马玖彤,安卫东,张凤君.结晶膜蒸馏回收废水中氯化铵的研究[J].水处理技术,2005.31(1):26-28
[9].Srisurichan S,Jiraratananon R,Fane A.Mass transfer mechanisms and transport resistances in direct contact membrane distillation process[J],Journal of membrane science.2006,277(1):186-194
[10].Alklaibi A,Lior N.Heat and mass transfer resistance analysis of membrane distillation[J].Journal of membrane science,2006,282(1):362-369
[11].Ding Z,Liu L,Yu J,et al.Concentrating the extract of traditional Chinese medicine by direct contact membrane distillation[J].Journal of membrane science,2008,310(1):539-549
[12].Khayet M,Godino M,Mengual J.Theoretical and experimental studies on desalination using the sweeping gas membrane distillation method[J].Desalination,2003,157(1):297-305
[13].Martínez-Díez L,Florido-Díaz F J.Desalination of brines by membrane distillation [J].Desalination,2001,137 (1-3):267-273
[14].贠延滨,马润宇, Fane A G.膜蒸馏污染研究[J].化工新型材料,2004,32(11):20-35
[15].阎建民,延滨,马润宇.膜蒸馏过程中的膜污染研究[J].膜科学与技术,2001, 21(3):21-23

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