Analysis on ceramic membrane fouling procedure and optimization of membrane flushing method
陶瓷膜污染过程分析与膜清洗方法优化

The alkaline organic washing wastewater of high concentrations was treated by cross-flow filtration of ceramic membrane with a pore size of 50 nm. The decline regularity of membrane flux was studied and regenerating the fouled membrane with reverse pulse flushing was carried out in 9 running cycles. Then the total resistance of the membrane fouling and its composition were calculated. The results showed that the proportions of membrane intrinsic resistance and concentration polarization pollution were lower compared to others. The membrane fouling resistances of Rt, Rc plus Rirf were higher and remained stable during every cycle. Moreover, the membrane was both blocked in the forms of pore blocking and cake layer filtration. Finally, the cleaning of membrane fouling was conducted with the pulse duration and frequency of 3 s/5 s for 3 min by 0.1% of HCl or 0.2% of oxalic acid. The membrane fouling could be removed effectively.