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首页> 外文期刊>Water Research >Membrane fouling in aerobic granular sludge (AGS)-membrane bioreactor (MBR): Effect of AGS size
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Membrane fouling in aerobic granular sludge (AGS)-membrane bioreactor (MBR): Effect of AGS size

机译：好氧颗粒污泥（AGS）-膜生物反应器（MBR）中的膜污染：AGS大小的影响

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The main goal of the current study was to investigate the membrane fouling mechanism of aerobic granular sludge (AGS) with various AGS sizes. In this regard, AGSs were sieved into 6 levels: 0 similar to 0.5, 0.5 similar to 0.7, 0.7 similar to 1, 1 similar to 1.2, 1.2 similar to 1.7 mm and larger than 1.7 mm, then filtrated by a small dead-end filtration cell. Interestingly, there appeared a critical AGS size (1 similar to 1.2 mm) for membrane fouling. Above 1.2 mm, flux increased and fouling reduced with size, due to the loose cake layer and high permeability caused by larger AGS. Below 1 mm, for smaller AGS, higher flux and lower fouling appeared, because less extra cellular polymeric substance (EPS) formed and adhered onto AGS foulants. In the critical size, membrane fouling was serious to the most extent, on account of the dual role of the compact structure of cake fouling layer and the adhesion of EPS. Moreover, this critical AGS size also possessed the highest cake layer, pore blocking and irreversible fouling, which generally existed in various operational conditions. Besides, the results of SEM, AFM, hydrophilicity and ATR-FTIR also proved that the existence of the maximum membrane fouling at the critical AGS size. This study provides a deep understanding of the membrane fouling mechanisms of AGS in membrane filtration and is beneficial for developing a new membrane fouling mitigation strategy by terms of regulating AGS size. (C) 2018 Elsevier Ltd. All rights reserved.
机译：当前研究的主要目的是研究各种AGS大小的好氧颗粒污泥（AGS）的膜污染机理。在这方面，将AGS筛分为6个级别：0类似于0.5，0.5类似于0.7，0.7类似于1，1类似于1.2，1.2类似于1.7毫米且大于1.7毫米，然后过滤一个小的死角过滤池。有趣的是，出现了膜结垢的临界AGS尺寸（1类似于1.2毫米）。大于1.2 mm时，由于松散的滤饼层和较大的AGS引起的高渗透性，通量随尺寸增加而增加，结垢减少。小于1 mm，对于较小的AGS，由于较高的形成和粘附在AGS污垢上的额外的细胞外聚合物（EPS），因此出现了较高的通量和较低的结垢。在临界尺寸上，膜结垢在很大程度上是严重的，这是由于饼结垢层的致密结构和EPS的粘附双重作用。此外，该临界AGS尺寸还具有最高的滤饼层，孔堵塞和不可逆结垢，通常在各种操作条件下都存在。此外，SEM，AFM，亲水性和ATR-FTIR的结果也证明在临界AGS尺寸下存在最大的膜污染。这项研究对膜过滤中AGS的膜污染机理提供了深入的了解，并通过调节AGS的大小有利于开发新的膜污染缓解策略。 （C）2018 Elsevier Ltd.保留所有权利。

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