RECENT RESEARCH ADVANCES AND FUTURE PROSPECT OF PARTICLE TRANSPORT MODELS FOR POROUS MEMBRANE FILTRATION
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摘要: 多孔膜过滤应用于水处理时,进水中的颗粒物可能会在膜表面吸附,使水流通道逐步缩小甚至完全堵塞,造成严重膜污染。因此,重点关注了水体颗粒物在多孔膜过滤系统中传质所引发的多层吸附和通道阻塞现象,并对描述污染过程的数值模型进行了综述。按照模拟尺度,现有模型可分为宏观、介观和微观模型3类。由于膜污染是颗粒-水流、颗粒-膜表面和颗粒-颗粒3种作用相互竞争的结果,因此完备的颗粒输移模型需要能够同时详细描述这3种相互作用。然而对于实际膜法水处理系统,现有模型还难以达到要求。据此,对未来膜污染模型和实验验证工作的发展需求作了简要概述,以期为水厂膜污染的控制提供参考。Abstract: During the application of porous membrane filtration to water treatment, particles in the feedwater can adsorb onto membrane surfaces and cause pore constriction or even blockage, resulting in severe membrane fouling. In this paper, studies pertaining to numerical models for the fouling process were systematically reviewed, with special focuses on the simulation of multilayer adsorption and the resultant pore constriction by waterborne particles. Generally, current models could be classified into three categories:macroscopic, mesoscopic and microscopic. Because membrane fouling involved the competitions between particle-fluid, particle-surface and particle-particle interactions, a suitable model should provide a detailed and simultaneous description of these interactions; this was currently difficult for realistic membrane filtration systems. Based upon these findings, this paper further outlined future prospect in developing and experimental validating numerical models for particulate membrane fouling. Advances in this field would better instruct water treatment plants to control membrane fouling.
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Key words:
- water treatment /
- porous membrane /
- filtration /
- particle transport model
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