电凝聚控制MBR膜污染的研究

试验考察了SECMBR的膜过滤特性,探讨了电凝聚对控制MBR膜污染的作用及机理.试验结果表明:胞外聚合物(EPS)、溶解性代谢产物(SMP)、ζ电位和污泥颗粒粒径等是膜污染的重要影响因素.SECM BR的膜污染远小于SM BR;SECM BR原位溶出铁离子与EPS结合,絮凝性增强,滤饼层污染减轻;SECM BR中电凝聚可降低单位容积活性污泥分泌的SM P与EPS,减轻膜污染;SECM BR降低EPS和SM P中主要污染物蛋白质的比例,减轻膜污染;ζ电位与Rc之间呈负相关,在SMBR与SECMBR中相关度分别为-0.798 8和-0.557 4.SECM BR在电场与铁粒子作用下降低了ζ电位绝对值,减轻了膜污染.

Research on Controlling MBR Membrane Fouling by Electro-Coagulation

Filtration characteristics of the submerged electric coagulation membrane bioreactor(SECMBR) membrane was investigated， function and mechanism of controlling MBR membrane fouling by electrocoagulation was discussed. The results show that the extracellular polymers (EPS)， soluble microbial products (SMP)， ζ potential and sludge particle size are the important influence factors of membrane fouling. Membrane fouling of SECMBR is much less than that of SMBR. In the SECMBR， the in situ dissolved iron ion combines with EPS which can enhance flocculation and alleviate pollution of cake layer. Electrocoagulation can reduce SMP and EPS secreted by unit volume activated sludge in SECMBR， and alleviate membrane pollution. SECMBR reduces the proportion of protein which is main pollution in EPS and SMP， and reduces membrane pollution. ζ potential has a negative correlation with R_c. Correlation degree is -0.7988 and -0.5574 in SMBR and SECMBR. Under the effect of electric field and iron ion， the ζ potential absolute value is reduced， and membrane pollution is alleviated.