Colloidal Fouling of Reverse Osmosis Membranes: Measurements and Fouling Mechanisms
Colloidal Fouling of Reverse Osmosis Membranes: Measurements and Fouling Mechanisms
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DOI：
10.1021/es970400v
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发表时间：
1997-11
影响因子：
11.4
通讯作者：
Xiaohua Zhu;M. Elimelech
中科院分区：
文献类型：
--
作者：
Xiaohua Zhu;M. Elimelech
研究了化学和物理相互作用对二氧化硅胶体醋酸纤维素和芳香族聚酰胺复合反渗透（RO）膜污染率的影响。使用实验室规模装置进行的结垢实验结果表明，胶体结垢率随着溶液离子强度、进料胶体浓度和通过膜的渗透水通量的增加而增加。结果表明，胶体污垢的速率是由渗透阻力和双电层斥力之间独特的相互作用控制的；也就是说，RO膜的胶体污染涉及物理和化学相互作用之间的相互关系（耦合）。对于天然水源水的典型溶液化学，正常操作条件下的渗透阻力比化学相互作用起着更重要的作用，并且可能最终控制胶体污垢的速率和程度。除了渗透阻力之外，膜表面形态对渗透阻力也有显着影响。
The effect of chemical and physical interactions on the fouling rate of cellulose acetate and aromatic polyamide composite reverse osmosis (RO) membranes by silica colloids is investigated. Results of fouling experiments using a laboratory-scale unit demonstrate that colloidal fouling rate increases with increasing solution ionic strength, feed colloid concentration, and permeate water flux through the membrane. It is demonstrated that the rate of colloidal fouling is controlled by a unique interplay between permeation drag and electric double layer repulsion; that is, colloidal fouling of RO membranes involves inter relationship (coupling) between physical and chemical interactions. For solution chemistries typical of natural source waters, permeation drag under normal operating conditions plays a more significant role than chemical interactions and may ultimately control the rate and extent of colloidal fouling. In addition to permeation drag, it is shown that membrane surface morphology has a marked ef...