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首页> 外文期刊>Journal of Membrane Science >Deposition of extracellular polymeric substances (EPS) and microtopographical changes on membrane surfaces during intermittent filtration conditions
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Deposition of extracellular polymeric substances (EPS) and microtopographical changes on membrane surfaces during intermittent filtration conditions

机译：间歇过滤条件下膜表面的细胞外聚合物沉积（EPS）和微观形貌变化

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Extracellular polymeric substances (EPS) play a significant role in modifying surface characteristics, eventually creating conditions suitable for bacterial attachment. The purpose of this study was to investigate the fouling potential of the EPS present in the effluent of an aerobic membrane bioreactor during intermittent filtration conditions. The aerobic rotational membrane system (ARMS) is a novel compact reactor which is designed to convert ammonia nitrogen in concentrated wastewater to nitrates with high conversion rates. The effluent from the reactor contains significant amounts of dissolved substrates which include EPS produced by the biofilm and salts. A series of cross-flow filtration tests were conducted with intermittent once a day short filtration periods using SEPA CFII membrane test cell and an RO membrane. The intermittent tests runs were conducted for overall filter use times of 1, 2, 4, and 6 days. Progression of the microtopographical changes, amount of EPS accumulation, and flux characteristics were evaluated. The images taken by atomic force microscopy (AFM) showed a layer of soft deposits forming over a strong sublayer firmly covering the membrane surface within a short time. The sublayer consisted of distinct modular units which were firmly attached to each other and to the membrane surface. The amount of EPS deposited on the membranes increased with use time and the membranes became significantly hydrophilic. The membrane flux declined gradually after each daily intermission until the 5th ± 1 day, then a small increase in flux was observed. The flux increase may be due to dislodging of some of the deposited material from the membrane surface due to shearing during cross-flow filtration conditions.
机译：细胞外聚合物（EPS）在修饰表面特性中起着重要作用，最终创造了适合细菌附着的条件。这项研究的目的是调查间歇过滤条件下好氧膜生物反应器废水中EPS的结垢潜力。好氧旋转膜系统（ARMS）是一种新颖的紧凑型反应器，旨在将浓缩废水中的氨氮以高转化率转化为硝酸盐。来自反应器的流出物包含大量溶解的底物，这些底物包括由生物膜产生的EPS和盐。使用SEPA CFII膜测试池和RO膜，每天短时间间隔进行一次间歇性的一系列错流过滤测试。间歇性测试运行的总过滤器使用时间为1、2、4和6天。评估了微观形貌变化，EPS积累量和通量特性的进展。原子力显微镜（AFM）拍摄的图像显示，在短时间内牢固覆盖膜表面的坚固子层上形成了一层软沉积物。子层由牢固地相互连接并固定在膜表面的不同模块单元组成。沉积在膜上的EPS量随使用时间的增加而增加，并且膜变得明显亲水。每天间歇至第5±1天后，膜通量逐渐下降，然后观察到通量略有增加。通量增加可能是由于在横流过滤条件下的剪切作用导致一些沉积材料从膜表面脱落所致。

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