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Evaluation of fouling formation and evolution on hollow fibre membrane: Effects of ageing and chemical exposure on biofoulant

机译:中空纤维膜上结垢的形成和演变的评估:老化和化学暴露对生物污垢的影响

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摘要

Bio-deposition and biofouling, a major challenge for membrane filtration, is still not fully understood due to its complex structure and intricate evolution with time and chemical environment. In this work, diluted sludge from an anaerobic bioreactor with low mixed liquor suspended solid (MLSS) concentration was filtered for 3.5 h to form initial fouling layers which were then exposed to various solution environments for 17 h. Apart from monitoring the hydraulic resistance of membrane fouling, a real time direct observation (DO) technique was applied to monitor the change of thickness in the fouling layer. The cohesion and adhesion of different fouling layer were investigated by monitoring the transmembrane pressure (TMP) and thickness change after applying relaxation (cessation of filtration) and backwash. It was found that TMPs and resistances of the aged fouling layers increased significantly after 17 h filtration. All the aged fouling layers exhibited lower compressibility as a result of more soluble microbial products (SMP) and extracellular polymeric substances (EPS) excretion, biofilm growth. From in situ imaging, the fouling on the membrane surface appeared to be inhomogeneous from the inner (lumen) surface outwards. During long term filtration of fouling layer with Milli-Q water, direct observation (DO) results indicated the reorganization of the fouling layer in terms of peeling, rolling over and re-depositing on the membrane surface, resulting into more compressed fouling layers with higher resistances. Confocal Laser Scanning Microscopy (CLSM) analysis of aged fouling layers also indicated that the dead/total ratio of microorganisms was not uniform and increased gradually from the bottom to the top of the fouling layers. (C) 2014 Elsevier Ltd. All rights reserved.
机译:生物沉积和生物污染是膜过滤的主要挑战,由于其复杂的结构以及随着时间和化学环境的复杂发展,至今仍未被完全理解。在这项工作中,将来自厌氧生物反应器的具有低混合液悬浮固体(MLSS)浓度的稀释污泥过滤3.5小时,以形成初始污垢层,然后将其暴露于各种溶液环境中17小时。除了监测膜结垢的水力阻力外,还应用了实时直接观察(DO)技术来监测结垢层厚度的变化。通过监测松弛(停止过滤)和反洗后的跨膜压力(TMP)和厚度变化,研究了不同污垢层的内聚力和粘附力。发现过滤17 h后,老化的污垢层的TMP和抗性显着增加。由于更多的可溶性微生物产物(SMP)和细胞外聚合物(EPS)排泄物,生物膜生长,所有老化的污垢层均显示出较低的可压缩性。从原位成像来看,从内(内腔)表面向外,膜表面的污垢似乎不均匀。在用Milli-Q水长期过滤污垢层的过程中,直接观察(DO)结果表明,污垢层在剥离,翻滚和重新沉积在膜表面方面发生了重组,从而形成了更多的压缩污垢层,具有更高的抵抗。共聚焦激光扫描显微镜(CLSM)对老化的污垢层的分析还表明,微生物的死/总比率不均匀,并且从污垢层的底部到顶部逐渐增加。 (C)2014 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Water Research》 |2015年第1期|182-193|共12页
  • 作者单位

    Tsinghua Univ, Dept Environm Sci & Engn, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China|Univ New S Wales, Sch Chem Engn, Ctr Membrane Sci & Technol, UNESCO, Sydney, NSW 2052, Australia;

    Univ New S Wales, Sch Chem Engn, Ctr Membrane Sci & Technol, UNESCO, Sydney, NSW 2052, Australia;

    Univ New S Wales, Sch Chem Engn, Ctr Membrane Sci & Technol, UNESCO, Sydney, NSW 2052, Australia;

    Tsinghua Univ, Dept Environm Sci & Engn, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Membrane fouling; Biofoulant; Direct observation; CLSM; Biofilm development;

    机译:膜污染;生物污染;直接观察;CLSM;生物膜形成;
  • 入库时间 2022-08-17 13:43:11

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