Fouling Behavior of Typical Organic Foulants in Polyvinylidene Fluoride Ultrafiltration Membranes: Characterization from Microforces

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• 作者：Lei Wang ; Rui Miao ; Xudong Wang ; Yongtao Lv ; Xiaorong Meng ; Yongzhe Yang ; Danxi Huang ; Ling Feng ; Ziwen Liu ; Kai Ju
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2013
• 出版时间：April 16, 2013
• 年：2013
• 卷：47
• 期：8
• 页码：3708-3714
• 全文大小：421K
• 年卷期：v.47,no.8(April 16, 2013)
• ISSN：1520-5851

文摘

To further unravel the organic fouling behavior of polyvinylidene fluoride (PVDF) ultrafiltration (UF) membranes, the adhesion forces of membrane鈥揻oulant and foulant鈥揻oulant were investigated by atomic force microscopy (AFM) in conjunction with self-made PVDF colloidal probe and foulant-coated colloidal probe, respectively. Fouling experiments with bovine serum albumin, sodium alginate, humic acid, and secondary wastewater effluent organic matter (EfOM) were carried out with PVDF UF membrane. Results showed a positive correlation between the membrane鈥揻oulant adhesion force and the flux decline rate and extent in the initial filtration stage, whereas the foulant鈥揻oulant interaction force was closely related to the pseudostable flux and the cake layer structure in the later filtration stage. For each type of foulant used, the membrane鈥揻oulant adhesion force was much stronger than the foulant鈥揻oulant interaction force, and membrane flux decline mainly occurred in the earlier filtration stage indicating that elimination of the membrane鈥揻oulant interaction force is important for the control of membrane fouling. Upon considering the foulant鈥揻oulant interaction force and the membrane flux recovery rate of fouled membranes, it was evident that the main contributor to physically irreversible fouling is the foulant鈥揻oulant interaction force.