膜生物反应器中膜污染机理及其防治

通过向一体式膜生物反应器中分别投加聚合铝和粉煤灰改变料液性质,来预防膜污染和提高膜生物反应器对总磷的去除效率,并通过X射线衍射和红外光谱实验分析活性污泥性质的变化,利用扫描电镜分析中空纤维膜表观结构的变化情况,探讨防治膜污染的机理.实验结果表明:聚合铝的投加改变了活性污泥的性质和生物膜的表观结构,可有效地减缓膜污染,且除磷效率达85%以上;而投加粉煤灰并没有明显效果.

Mechanism of Membrane Fouling in Membrane Bioreactor and Its Prevention

In order to prevent membrane fouling and improve the elimination effect of phosphorus,polymeric aluminum and fly-ash were fed to membrane bioreactor to change the property of wastewater treatment;meanwhile active sludge was analyzed with X-ray diffraction and infrared spectrum methods,and hollow membrane was probed with SEM to investigate the mechanism of membrane fouling.The results show that the property of active sludge and bio-membrane structure were changed by adding polymeric aluminum,especially the removal rate of phosphorous could reach 85% and the membrane fouling was reduced effectively.Moreover no effect was observed when ash-fly was fed into the membrane bioreactor.