Studies of membrane fouling mechanisms involved in the micellar-enhanced ultrafiltration using blocking models
Studies of membrane fouling mechanisms involved in the micellar-enhanced ultrafiltration using blocking models
复制标题
使用阻塞模型研究胶束增强超滤中涉及的膜污染机制
DOI：
10.1039/c5ra06063j
复制
发表时间：
2015-01-01
期刊：
影响因子：
3.9
通讯作者：
Jaffrin, Michel Y.
中科院分区：
文献类型：
--
作者：
Zhang, Wenxiang;Liang, Wenzhong;Jaffrin, Michel Y.
胶团强化超滤（MEUF）是一种很有前途的去除废水中有机污染物的技术。通过室内实验研究了4种Gemini表面活性剂（CG 12、CG 16、CG 12 + Brij 35、CG 16 + Brij 35）处理模拟废水的性能。结果表明，CG 16-Brij 35具有最低的通量行为和最好的去除苯酚和表面活性剂的效率。利用孔堵塞模型来估计表面活性剂系统的膜污染。对于CG 12和CG 12 + Brij 35体系，内部孔隙堵塞、中间孔隙堵塞和滤饼形成模型同时发生。内孔堵塞和滤饼形成是CG 16胶束的主要污染机理。对于CG 16-Brij 35，滤饼层是主要的结垢机理。孔隙堵塞程度增加的顺序为CG 12 <CG 16 <CG 12 + Brij 35 <CG 16 + Brij 35。利用扫描电镜（SEM）、全反射红外光谱（ATR-FTIR）和压汞仪对膜表面形貌、膜材料特性和膜污染层进行了分析，并对膜污染机理进行了验证。由于高通量行为，优异的苯酚截留率和低膜污染，CG 12是一个更理想的选择。研究结果有助于了解Gemini表面活性剂存在下MEUF的结垢机理，并为优化操作策略提供了有价值的依据。
Micellar-enhanced ultrafiltration (MEUF) is a promising technology to remove organic contaminants from wastewater. A laboratory experiment was carried out to study the performance of four Gemini surfactant systems (CG12, CG16, CG12 + Brij35, CG16 + Brij35) for treating synthetic wastewater. The results show that CG16–Brij35 possesses the lowest flux behavior and the best rejection efficiencies toward phenol and surfactants. Pore blocking models are utilized to estimate membrane fouling of surfactant systems. For CG12 and CG12 + Brij35 systems, internal pore blocking, intermediate pore blocking and cake formation models occur simultaneously. Internal pore blocking and cake formation are the main fouling mechanisms of CG16 micelles. With respect to CG16–Brij35, cake layer is the main type of fouling mechanism. The increased pore blocking degree follows the order of CG12 < CG16 < CG12 + Brij35 < CG16 + Brij35. Furthermore, SEM, ATR-FTIR and a mercury porosimeter are used to analyze membrane surface morphology, membrane material characteristics and membrane fouling layer, as well as examine and verify fouling mechanisms. Due to high flux behavior, excellent phenol rejection and low membrane fouling, CG12 is a more desirable selection. Studies output helps to understand the fouling mechanism of MEUF in the presence of Gemini surfactants, and gave valuable evidence to optimize operation strategies.