双模式微孔曝气对MBR膜污染的控制

摘要

为减轻膜生物反应器运行过程中的膜污染,研究了不同曝气模式对膜污染的影响.结果表明:单模武微孔曝气条件下,曝气孔径越大膜污染阻力越低;双模式(双营)微孔曝气条件下,孔径差值越大膜污染阻力越低,曝气管与膜组件间距越大膜污染越严重;双模式(三管)微孔曝气条件下,曝气管存在最佳位置.所用反应器的最佳曝气组合为1μm+10μm+1μm双模式(三管)曝气,膜污染阻力为0.834×1012 m-1.%The effects of different aeration modes on membrane fouling were studied in membrane bioreactor.Results showed that:The membrane resistance decreased according to the increase of the pore size when single-mode microporous aeration was applied in the membrane bioreactor,while the membrane resistance decreased according to the increase of the difference in pore size when dual-mode microporous aeration(two tubes) was applied,the greater the distance between the aeration tube and the membrane module was,the more serious the membrane fouling was.When dual-mode microporous aeration(three tubes)was applied in the membrane bioreactor,the position of the tubes should be optimized to decrease the membrane fouling.The best aeration combination was dual mode (three tubes) aeration with 1 μm + 10 μm + 1 μm,the membrane fouling resistance was0.834 ×1012 m-1.