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首页> 外文期刊>Water Research >A hybridized photocatalysis-microfiltration system with iron oxide-coated membranes for the removal of natural organic matter in water treatment: Effects of iron oxide layers and colloids
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A hybridized photocatalysis-microfiltration system with iron oxide-coated membranes for the removal of natural organic matter in water treatment: Effects of iron oxide layers and colloids

机译：具有氧化铁膜的混合光催化微滤系统，用于去除水处理中的天然有机物：氧化铁层和胶体的作用

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摘要

A photocatalysis/microfiltration (MF) hybrid system, with the coating of a membrane using iron oxide particles (IOPs), was investigated with respect to natural organic matter (NOM) removal and membrane permeability during the treatment of various surface waters. A comparison of the performance between bare (uncoated) and IOP-coated membranes employed for the photocatalytic hybrid system was made. Due to the additional adsorption of NOM onto IOPs on the membrane surface, the IOP-coated membrane system always achieved greater DOC removal efficiencies during photocatalysis/MF. Particularly, the influence of colloidal particles that were present in different water sources with respect to membrane fouling was explored. Colloidal fouling occurred to both bare and IOP-coated membranes, but the interaction of colloids with IOP coating layers was in close association with the characteristics of colloids, such as size distribution, resulting in opposing fouling behaviors with varying water sources. The IOP-coated membrane was able to control fouling properly when a relatively large size of colloidal particles existed in raw water, but not for the case of small colloids. The IOP coat layer may become denser as small colloids penetrate into it, therefore leading to further fouling. The analysis of the hydraulic filtration resistances revealed that such fouling was virtually reversible in being removed by backwashing processes. Scanning electron microscopic observations, however, visualized the existence of several foulants remaining at the membrane surface after backwashing when feed water, containing a relatively large portion of small-sized colloids, was supplied.
机译：针对在各种地表水处理过程中天然有机物（NOM）的去除和膜的渗透性，研究了使用氧化铁颗粒（IOP）覆盖膜的光催化/微滤（MF）混合系统。比较了光催化杂化系统中使用的裸露（未涂覆）膜和IOP涂覆膜之间的性能。由于NOM在膜表面的IOP上有额外的吸附作用，因此在光催化/ MF过程中，涂有IOP的膜系统始终具有更高的DOC去除效率。特别地，探讨了存在于不同水源中的胶体颗粒对膜结垢的影响。裸膜和涂有IOP的膜均发生胶体结垢，但胶体与IOP涂层之间的相互作用与胶体的特性（例如大小分布）密切相关，导致在不同的水源下出现相反的结垢行为。当原水中存在较大尺寸的胶体颗粒时，使用IOP涂层的膜能够适当地控制结垢，但对于小胶体而言则不能。当小胶体渗透到IOP涂层中时，它可能变得更致密，从而导致进一步结垢。对水力过滤阻力的分析表明，这种污垢在通过反冲洗过程去除时实际上是可逆的。然而，当供应包含相对较大比例的小尺寸胶体的给水时，扫描电子显微镜观察可视化了反洗后残留在膜表面的几种污垢的存在。

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