Study on Permeability Stability of Sand-Based Microporous Ceramic Filter Membrane
Study on Permeability Stability of Sand-Based Microporous Ceramic Filter Membrane
复制标题
砂基微孔陶瓷滤膜渗透稳定性研究
DOI：
10.3390/ma12132161
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发表时间：
2019-07-01
期刊：
影响因子：
3.4
通讯作者：
Yao, Chunping
中科院分区：
文献类型：
--
作者：
Zhou, Wei;Zhang, Lin;Yao, Chunping
过滤不稳定性是微孔陶瓷过滤膜在实际应用中普遍存在的问题。本文以廉价的标准砂和河砂为基体材料，制备了一系列微孔陶瓷过滤膜。通过分析水流与材料性能的响应机理，建立了陶瓷膜有效渗透半径随时间变化的半经验公式。最后，在理论分析的基础上，提出了提高渗透通量的措施。实验结果表明，在过滤初期，微孔陶瓷过滤膜的渗透通量变化较大，过滤后期渗透通量趋于稳定。随着时间的推移，开孔率和闭孔率改变了陶瓷膜的实际渗透面积，从而影响渗透通量的稳定性和最终的稳定渗透通量。微孔陶瓷孔内壁的粗糙度影响了水力损失系数，从而控制了流出过程。砂中富含微量元素，烧结后产生大量的玻璃相。玻璃相中极性基团丰富，与小流量的水分子形成暂时的氢键。这使得陶瓷膜沿水流方向的侧壁粘阻效应增大，陶瓷膜的渗透通量随时间变化的程度。
The instability of diafiltration is a widespread problem in the practical application of microporous ceramic filtration membranes. In this paper, a series of microporous ceramic filter membranes were prepared using inexpensive standard sand and river sand as matrix materials. Semi-empirical formula for the effective permeability radius of ceramic membranes with respect to time was established from analysis of the response mechanism between water flow and material properties. Finally, on the basis of theoretical analysis, some measures were proposed to improve permeate flux. The experimental results showed that during the initial stage of filtration, the microporous ceramic filter membrane had a large change in permeate flux, and during the late stage of filtration, permeate flux tended to be stable. Over time, open porosity and closed porosity changed the actual seepage area of the ceramic membrane, and this affected the stability of permeate flux and final stable permeate flux. The roughness of the inner wall of microporous ceramic pores affected the hydraulic loss coefficient, and this controlled the outflow process. Trace elements that were rich in sand produced a large amount of glass phase after sintering. The glass phase was rich in polar groups and formed a temporary hydrogen bond with the small flow of water molecules. It led to an increase in viscous resistance effect of the side wall along the water flow and the extent of the permeate flux of the ceramic membrane changed with time.