Relationship between sludge settleability and membrane fouling in a membrane bioreactor

被引：18
作者：
Sun Y. [1 ]
Wang Y. [1 ]
Huang X. [1 ]
机构：
[1] Environmental Simulation and Pollution State Key Joint Laboratory, Department of Environmental Science and Engineering, Tsinghua University
来源：
Frontiers of Environmental Science & Engineering in China | 2007年 / 1卷 / 2期
关键词：
Filamentous bacteria; Membrane bioreactor; Membrane fouling; Sludge settleability; Trans-membrane pressure;
D O I：
10.1007/s11783-007-0038-9
中图分类号：
学科分类号：
摘要：
The evolution of activated sludge settleability and its relationship to membrane fouling in a submerged membrane bioreactor were studied at a lab-scale equipment fed with synthetic wastewater. It was found that sludge volume index (SVI) gradually increased and the sludge settleability was reduced, which was caused by the propagation of filamentous bacteria. With increasing SVI, the average increasing rate of trans-membrane pressure increased, the stable filtration period was shortened, and the two stages (smooth stage and accelerating stage) of the trans-membrane pressure were more obvious. At the same time, the increasing rate of trans-membrane pressure at the smooth stage decreased and the rate at the accelerating stage increased with SVI, respectively. The observation by using scanning electronic microscopes showed the cake layer with loose structure and large thickness formed on the membrane surface due to the appearance of filamentous bacteria and high SVI in sludge. Influence of the sludge settleability on the trans-membrane pressure was related to the structure and thickness of the cake layer on the membrane. © Higher Education Press 2007.
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页码：221 / 225
页数：4
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