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首页> 外文期刊>Journal of water reuse and desalination >Fouling behaviour of a reverse osmosis membrane by three types of surfactants
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Fouling behaviour of a reverse osmosis membrane by three types of surfactants

机译：三种表面活性剂对反渗透膜的污染行为

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摘要

The fouling behaviour of a reverse osmosis (RO) membrane by three types of surfactants and a countermeasure to the fouling were studied. The filtration experiments showed that the permeability during filtration depended on the surfactant concentration and the charge of surfactant. Higher surfactant concentration deteriorated the permeability due to the concentration polarization. A negatively charged anionic surfactant, sodium lauryl sulfate (SLS), had less influence on the permeability than cationic and non-ionic surfactants. As the RO membrane used in this research had a hydrophilic and negatively charged membrane surface, adsorption of the anionic surfactant was prevented by the electrostatic force between the membrane surface and the hydrophilic group of the surfactant. To control the fouling by the cationic and non-ionic surfactants, addition of SLS to the surfactant solution was tested. Consequently, the addition of excess SLS changed the surface charge of aggregates into more negative value and the permeability during filtration was successfully improved. Furthermore, the drop in pure water permeability after filtration was not observed by the addition of excess SLS. Thus, the modification of charge of solutes to the same sign of the membrane surface charge was thought to be useful to control a membrane fouling by surfactants.
机译：研究了三种表面活性剂对反渗透膜的污染行为及对策。过滤实验表明，过滤过程中的渗透率取决于表面活性剂的浓度和表面活性剂的电荷。由于浓度极化，较高的表面活性剂浓度降低了渗透性。带负电的阴离子表面活性剂十二烷基硫酸钠（SLS）对渗透性的影响小于阳离子和非离子表面活性剂。由于本研究中使用的RO膜具有亲水性且带负电荷的膜表面，因此可以通过膜表面与表面活性剂的亲水基团之间的静电力来防止阴离子表面活性剂的吸附。为了控制阳离子和非离子表面活性剂的结垢，测试了在表面活性剂溶液中添加SLS的情况。因此，添加过量的SLS使聚集体的表面电荷变为更多的负值，并成功提高了过滤过程中的渗透性。此外，通过添加过量的SLS未观察到过滤后纯水渗透率的下降。因此，认为将溶质的电荷修饰成与膜表面电荷相同的符号对于控制表面活性剂对膜的污染是有用的。

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