Characterization of cake layer structure on the microfiltration membrane permeability by iron pre-coagulation

查看全文 作　　者：Jin [1]Wang;Siru [1]Pan;Dongping [1]Luo

机构地区：[1]Department of Municipal and Environmental Engineering,School of Civil Engineering,Beijing Jiaotong University

出　　处：《Journal of Environmental Sciences》索引2013年第25卷第2期,共8页

基　　金：supported by the National Natural Science Foundation of China (No.50978014);the Fundamental Research Funds for the Central Universities (No.2011JBM077) 摘　　要：A cake layer is formed by coagulation aggregates under certain transmembrane pressure in the coagulation-microfiltration (MF) process. The characteristics of humic acid aggregates coagulated by different iron-based coagulants, such as charge, size, fractal dimension and compressibility, have an effect on the cake layer structure. At the optimum iron dose of 0.6 to 0.8 mmol/L for ferric chloride (FC) and polymer ferric sulfate (PFS) pre-coagulation, at the point of charge neutralization for near zero zeta potential, the aggregate particles produced possess the greatest size and highest fractal dimension, which contributes to the cake layer being most loose with high porosity and low compressibility. Thus the membrane filterability is better. At a low or high iron dose of FC and PFS, a high negative or positive zeta potential with high charge repulsion results in so many small aggregate particles and low fractal dimension that the cake layer is compact with low porosity and high compressibility. Therefore the membrane fouling is accelerated and MF permeability becomes worse. The variation of cake layer structure as measured by scanning electric microscopy corresponds with the fact that the smaller the coagulation flocs size and fractal dimension are, the lower the porosity and the tighter the cake layer conformation. This also explains the MF membrane flux variation visually and accurately. 关键词：滤饼层膜渗透结构表征铁基微滤 ZETA电位聚集体颗粒分形维数

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Characterization of cake layer structure on the microfiltration membrane permeability by iron pre-coagulation

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