Effect of sludge characteristics on membrane fouling in membrane bioreactors
Effect of sludge characteristics on membrane fouling in membrane bioreactors
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DOI：
10.1016/j.memsci.2009.11.055
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发表时间：
2010-03-01
影响因子：
9.5
通讯作者：
Lee, Hsin-Chieh
中科院分区：
文献类型：
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作者：
Pan, Jill Ruhsing;Su, Yu-Chun;Lee, Hsin-Chieh
在本研究中，对浸没式膜生物反应器（MBR）中污泥特性对膜污染的影响进行了研究。通过使用好氧选择器，将因丝状细菌过度生长而膨胀的污泥转变为正常污泥。无论生物反应器的污泥质量如何，MBR都实现了优异的出水水质。在整个实验过程中，总有机碳（TOC）和氨氮的去除率分别保持在约98%和99%左右。然而，尽管膨胀污泥的粒径分布较大，但在其出现期间仍观察到严重的污染。发现毛细吸水时间（CST）与溶解性微生物产物（SMP）的量和膜污染高度相关。因此，它可作为SMP和污染潜力的一个简单指标。发现丝状细菌在混合液中产生更多的SMP，包括溶解性多糖和溶解性蛋白质，这导致了严重的污染。特别是，高浓度溶解性多糖的释放导致膨胀污泥中出现严重污染。发现正常污泥和膨胀污泥中结合态胞外聚合物（EPS）相似，它不是膜污染的主要原因。总之，混合液中的溶质，如SMP，是导致膜污染的原因，增加剪切应力无法防止这种污染。（C）2009爱思唯尔有限公司。保留所有权利。
In this study, the impact of sludge characteristics on membrane fouling in a submerged membrane bioreactor (MBR) was investigated. Bulking sludge due to excess growth of filamentous bacteria was changed to normal sludge by use of an aerobic selector. Excellent effluent quality was achieved in the MBR regardless of the quality of the sludge of the bioreactor. The removal rates of total organic carbon (TOC) and ammonia nitrogen were maintained at around 98 and 99%, respectively, during the entire experiment. However, serious fouling was observed during the occurrence of the bulking sludge despite having larger particle size distribution. Capillary suction time (CST) was found highly related to the amount of soluble microbial products (SMP) and membrane fouling. Therefore, it could be used as a simple indicator for SMP and fouling potential. Filamentous bacteria were found to produce more SMP including soluble polysaccharides and soluble proteins in the mixed liquor, which resulted in severe fouling. In particular, the release of high concentration of soluble polysaccharides resulted in serious fouling in bulking sludge. Bound EPS which was found similar in the normal sludge and bulking sludge was not the main cause for membrane fouling. In conclusion, solutes in mixed liquor such as SMP are responsible for membrane fouling, which cannot be prevented by increasing shear stress. (C) 2009 Elsevier B.V. All rights reserved.