新型折板膜组件的优化设计及其在MBR中的应用

Optimization design of a new folded plate membrane module and its application in MBR

膜污染是膜生物反应器亟需解决的关键问题.为了在不增加能耗的条件下减缓膜污染,本文改进平板膜组件,设计新型折板膜组件.通过恒压膜过滤实验对折板膜组件的竖直倾角和膜间距进行了优化,应用粒子图像测速技术对折板膜面附近的流场特性进行了表征,并通过折板膜组件在MBR中的应用考察其抗污染性能和出水效果.研究结果表明,在15°的最优竖直倾角下,相对平板膜组件,折板膜组件获得了50.3%的最高稳定通量提升幅度;折板膜组件的最优膜间距为30mm,且膜组件正下方曝气能获得更高的稳定通量;另外,折板膜组件的跨膜压力上升速率约为平板膜组件的0.4倍,对化学需氧量(COD)和NH3—N的去除效率分别高于90%和80%.

Membrane fouling is a key problem to be solved in MBR.In order to mitigate the membrane fouling without extra energy consumption,a new folded plate membrane module was designed by modifying the configuration of the flat sheet membrane module.The constant trans-membrane pressure（TMP）membrane filtration experiments were conducted to optimize the vertical inclination angle and membrane spacing of the folded plate membrane module,and the particle image velocimetry（PIV）technology was used to characterize the feature of flow field near the membrane surface.Finally,the application of the folded plate membrane module in MBR was to investigate its antifouling property and effluent effect.The research results showed that the optimal vertical inclination angle and membrane spacing of the folded plate membrane module were 15°and 30 mm,respectively.And a larger stable flux could be obtained when the aeration position was directly below the folded plate membrane module.Additionally,the rising rate of TMP of the folded plate membrane module was 0.4times as fast as that for the flat sheet membrane module,and the removal rates of COD and NH3- N for both folded plate membrane module and flat sheet membrane module were above 90% and 80%,respectively.