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Study on the Transfer Resistances of Vacuum Membrane Distillation with High Concentration NaCl Solution

Authors： YOU Wen-Ting, DONG Zhe-Qin, ZHANG Mi, XU Zhen-Liang

Units： State Key Laboratory of Chemical Engineering, Membrane Science and Engineering R&D Lab, Chemical Engineering Research Center, East China University of Science and Technology, Shanghai 200237)

KeyWords： vacuum membrane distillation; transfer resistances; concentration; membrane fouling

ClassificationCode：TQ028. 8

year,volume(issue):pagination： 2014,34(6):1-5

Abstract：

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

Funds：

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)。

AuthorIntro：

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

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