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Relationship between sludge settleability and membrane fouling in a membrane bioreactor

Frontiers of Environmental Science & Engineering 2007年第2期1卷 221-225页

作者： SUN Yujiao WANG Yong HUANG Xia Environmental Simulation and Pollution State Key Joint Laboratory Department of Environmental Science and EngineeringTsinghua UniversityBeijing 100084China

The evolution of activated sludge settleability and its relationship to membrane fouling in a submerged mem-brane bioreactor were studied at a lab-scale equipment fed with synthetic *** was found that sludge volume index(SVI)gradually increased and the sludge settleability was reduced,which was caused by the propagation of filamentous *** 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 *** 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,*** 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 *** of the sludge settleability on the trans-membrane pressure was related to the structure and thickness of the cake layer on the membrane.

关键词： membrane bioreactor membrane fouling trans-membrane pressure sludge settleability filamentous bacteria

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