Influence of floc structure on membrane permeability in the coagulation-MF process
Influence of floc structure on membrane permeability in the coagulation-MF process
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DOI：
10.2166/wst.2005.0632
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发表时间：
2005-01-01
影响因子：
2.7
通讯作者：
Lee, S
中科院分区：
文献类型：
--
作者：
Cho, MH;Lee, CH;Lee, S
研究了混凝- mf混合过程中絮凝体结构与膜透性的关系。混凝过程中絮团结构随操作参数的变化而变化，并用分形维数（dF）对絮团结构进行了量化。悬浮胶体与注入混凝剂的浓度比对混凝絮凝体的dF有重要影响。当ALT（铝离子浓度/悬浮粒子浓度）为0.4 ~ 0.8时，絮凝体体积较大，分形维数较低。絮凝体在20分钟以上的混凝时间内保持稳定。低分形维数的混凝絮凝体提高了膜的透气性，其孔隙率较高，聚集相对松散。这些多孔絮凝体降低了絮凝体的比阻。研究了膜过滤性能与絮凝体分形维数的关系。
The relation between floc structure and membrane permeability was studied in a coagulation-MF hybrid process. The floc structure changed with operating parameters in the coagulation process and was quantified with fractal dimension (dF). The concentration ratio between suspended colloids and injected coagulant had an essential effect on dF of coagulated flocs. Larger flocs with low fractal dimension were produced for ALT (aluminum ion concentration dosed/suspended particle concentration) between 0.4 and 0.8. Flocs maintained stable characteristics at the coagulation period of over 20 minutes. Membrane permeability was improved with coagulated flocs of lower fractal dimension, which tend to have higher porosity and aggregate relatively loosely. These more porous flocs reduce specific resistance of coagulated flocs. The relation between membrane filterability and fractal dimension of flocs was explored in a submerged MF hybrid system as well as in a batch unstirred cell filtration.