高通量-高截留率时间维度膜法水处理机理研究  

Mechanism of water treatment by high permeability-selectivity time dimension membrane method

作　　者：周文轩 刘珍[2] 张福建 张忠强[1,3] ZHOU Wenxuan;LIU Zhen;ZHANG Fujian;ZHANG Zhongqiang(School of Mechanical Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China;School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212013,Jiangsu,China;State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116023,Liaoning,China)

机构地区：[1]江苏大学机械工程学院,江苏镇江212013 [2]江苏科技大学船舶与海洋工程学院,江苏镇江212013 [3]大连理工大学工业装备结构分析国家重点实验室,辽宁大连116023

出　　处：《化工学报》2024年第7期2583-2593,共11页CIESC Journal

基　　金：国家自然科学基金项目(12272151);国家自然科学基金重大研究计划集成项目(92248301)。

摘　　要：传统固液两相流膜分离技术利用尺寸效应易受到渗透性-选择性权衡的制约、膜污染与浓差极化等挑战。通过引入旋转剪切动态膜技术与施加固液滑移边界条件,利用膜表面颗粒径向穿透膜孔的时间大于切向划过孔径的时间——时间维度选择性,可有效同步提升渗透性和选择性。通过建立滑移边界旋转剪切动态膜过滤模型,对稀悬浮液微滤过程进行有限元模拟仿真,并结合理论分析揭示了滑移速度、膜厚度与孔隙率等关键参数对膜分离性能的影响规律。结果表明,对于比颗粒直径大1~10倍的膜孔径,在时间维度选择性与流体剪切诱导颗粒迁移的协同作用下,可获取95%以上的微颗粒截留率和350 L(/m^(2)·h)以上的有效水通量。该研究结果进一步验证并拓展了时间维度选择性机理在微米尺度的适用性,并为高通量-高截留率动态膜法水处理技术提供了新思路。Traditional solid-liquid two-phase membrane separation technology,which utilizes size effects,is easily constrained by the trade-off between permeability and selectivity,membrane fouling and concentration polarization.By introducing rotating shear dynamic membrane technology and applying solid-liquid slip boundary conditions,the time difference between particles penetrating the membrane pores radially and sliding over the membrane pores tangentially—temporal selectivity,can effectively enhance both permeability and selectivity simultaneously.By establishing a slip boundary rotating shear dynamic filtration membrane model,conducts finite element simulation of its microfiltration process for dilute suspensions,and theoretically revealed the influence of key parameters such as slip velocity,membrane thickness and porosity on membrane separation performance.The results show that for membrane pore diameters that are 1—10 times larger than the particles,under the synergistic effect of time dimension selectivity and shear-induced migration of particles,there is still a particle selectivity of over 95%and an effective water flux of more than 350 L/(m^(2)·h).This result further verifies and expands the applicability of the temporal selectivity mechanism at the micron scale,and provides a new idea for high permeability-selectivity dynamic membrane water treatment technology.

关 键 词：水处理 膜 过滤 固液两相流分离 时间维度选择性 计算流体力学 

分 类 号：TQ028.8[化学工程]