膜科学与技术

不对称静电场强化膜蒸馏过程研究

作者：苗成朋¹，杜文林¹，陈佳¹，孟慧琳²，石雪莉²，王南南¹，杜润红¹

单位： 1. 天津工业大学分离膜与膜过程国家重点实验室，天津300160； 2.中国膜工业协会，北京 100029

关键词：膜蒸馏；静电场；电位梯度

出版年,卷(期):页码： 2016,36(2):55-59

摘要：

本文通过在膜蒸馏系统中附加不对称静电场，利用极性分子在不对称静电场中的取向和定向迁移，使水分子受到压力梯度和电位梯度两个推动力的耦合作用，在压力场与不对称静电场形成的耦合场中，提高水分子的渗透速率。对于离子或大分子等不能挥发的物质，静电场的有无对这些物质的传质基本无影响，因此引入不对称静电场可在提高渗透通量的同时，提高过程的分离性能。本文考察了耦合场膜蒸馏过程中水分子的传质规律，并以盐水溶液、染料水溶液、天然产物水溶液为例，探讨了该过程在海水淡化、废水处理以及热敏性物质浓缩应用中的特性。

Polar molecules orient and migrate in an asymmetric electric field. Providing an asymmetric electric field across a membrane in a membrane distillation process for water treatment, thetransport of water will be driven by the pressure gradient and the electric potential gradient, and thus the water permeation will be accelerated in the pressure-electric coupled field. Salts and macromolecules are nonvolatile and thetransport of these solutes willnot be affected by the electric field. Therefore, by applying the asymmetric electric field, both the water flux and the separation can be improved. The mass transport of water molecules in the coupled field was investigated, andthe applications of the asymmetric electric fieldenhanced membrane distillation for desalination, treatment of dye solutions and concentration of thermal-sensitive compounds were alsoevaluated.

苗成朋，男，硕士研究生，主要从事不对称静电场强化膜分离过程的研究 *通讯作者：durunhong@tjpu.edu.cn，

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