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首页> 外文会议>Membrane technology 2008 >MEMBRANE FOULING IN SUBMERGED MEMBRANE BIOREACTORSDURING PEAK WET WEATHER FLOW. MODELING FOR DESIGN ANDOPERATION
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MEMBRANE FOULING IN SUBMERGED MEMBRANE BIOREACTORSDURING PEAK WET WEATHER FLOW. MODELING FOR DESIGN ANDOPERATION

机译：高峰湿天天气期间，淹没式膜生物反应器中的膜污染。设计和运营建模

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A mathematical model that describes the dynamic behavior of submerged membranernfouling was incorporated into a hydraulic model of an MBR. It incorporates internalrnfouling of the membrane due to pore blocking and reduction, and fouling due to cakernformation. The model allows the evaluation of operational strategies of the membrane asrna result of a given input hydrograph to the plant. It produces the evolution ofrntransmembrane pressure TMP as a function of time as the hydrograph transits throughrnthe plant. Changes in concentration of MLSS in each of the reactors as a result of thernoperation are presented. Three operational strategies are evaluated. The effect of havingrna VFD in the return flow of the membrane tank, and the tradeoff between morernmembrane filtration capacity or having an EQ tank at the head of the plant are discussed.rnThe presence of the VFD is beneficial because it limits the concentration of MLSS in thernmembrane tank and reduces cake associated TMP. It is observed that the duration of thernpeak flux required from the membrane is critical in the overall behavior of the system. Arnlower peak flux of greater duration can be a more challenging condition to the membranernsystem than a higher peak flux of short duration. When selecting a design storm forrnmembrane sizing is important to specify not only the return frequency but also thernduration. No attempt was done to incorporate changes in filterability of the sludge due tornchanges of the chemistry of the water matrix during the storm. These effects can bernadded in the future; however, it is expected that their effect further emphasize thernconclusions reached here.
机译：描述淹没式膜污染的动态行为的数学模型被合并到MBR的水力模型中。它结合了由于孔堵塞和减少引起的膜的内部结垢，以及由于结块形成的结垢。该模型允许评估给定输入水位图到工厂的膜asrna结果的操作策略。当水位线穿过植物时，它会产生跨膜压力TMP随时间的变化。介绍了由于操作导致的每个反应器中MLSS浓度的变化。评估了三种操作策略。讨论了在膜罐的回流中使用VFD的影响，以及在更多的膜过滤能力或在工厂的顶部安装EQ罐之间的权衡。rnVFD的存在是有益的，因为它限制了MLSS在膜中的浓度。膜罐，减少与蛋糕相关的TMP。观察到，膜所需的峰通量的持续时间对于系统的整体性能至关重要。与较短持续时间的较高峰值通量相比，较长持续时间的较高峰值通量对膜系统可能是更具挑战性的条件。选择设计风暴时，膜的尺寸确定不仅要指定返回频率，而且要指定持续时间，这一点很重要。没有尝试合并由于暴风雨期间水基质化学的变化引起的污泥可过滤性的变化。将来可以消除这些影响。但是，预期它们的作用会进一步强调此处得出的结论。

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