以活性污泥混合液为污染介质,采用标准堵塞模型和沉积过滤模型预测聚间苯二甲酰间苯二胺(PMIA)中空纤维膜在模拟MBR系统运行中的污染类型,并结合膜孔径、污泥混合液粒径分布及污染阻力分布加以验证;同时考察PMIA中空纤维膜生物反应器处理COD、NH+-N、TP的去除效果,借助场发射扫描电镜(FESEM)和特征X射线能谱分析仪(EDX)对比污染加重时水洗和化学清洗效果.结果表明,浓差极化阻力约占总阻力的19.18％,滤饼层阻力约占总阻力的45.57％,膜孔堵塞阻力约占总阻力的20.76％,膜污染以膜表面污染物沉积为主.经MBR处理后COD、NH+-N、TP平均去除率分别达到98.28％、98.07％、41.81％.当膜表面污染程度加重时,经化学清洗后膜表面元素更接近于原膜,且压差恢复率更高,清洗效果较佳.
The fouling type of the aromatic poly (m-phenyleneisophthalamide) (PMIA) hollow fiber membranes was determined by fitting experimental data to pore blocking model and cake fouling model in a simulative MBR system.At the same time,the effluent quality (COD、NH+ 4-N、TP) of the PMIA-MBR was investigated.In addition,field emission scanning electron microscopy (FESEM) and energy dispersive X-ray spectrometer (EDX) were used to analyse the performance of the cleaning with water and chemicals.The results showed that concentration polarization、cake layer resistance and membrane pore blocking resistance could account for 19.18％、45.57％、20.76％ of total resistance,respectively.So the membrane fouling type was mainly sedimentary and compacting of cake layer pollutants.Moreover,the MBR operating results showed that the average removal of COD,NH4+-N and TP up to 98.28％,98.07％ and 41.81％,respectively.The chemical cleaning experiment demonstrated that the elements onthe membrane surface were similar to the original membrane.At the same time,the TMP recovery rate with chemical cleaning was slightly higher than water cleaning.So chemical cleaning was better than water cleaning.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%