Quantification of interfacial interactions between a rough sludge floc and membrane surface in a membrane bioreactor

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• 作者：Xiang Cai^a ; ¹ ; Meijia Zhang^a ; ¹ ; Lining Yang^a ; Hongjun Lin^a ; ^{hjlin@zjnu.cn} ; Xilin Wu^a ; Yiming He^b ; Liguo Shen^a ; ^{lgshen@zjnu.cn}
• 关键词：Interfacial interaction ; Membrane bioreactor ; Membrane fouling ; Rough surface ; Sludge floc
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：490
• 期：Complete
• 页码：710-718
• 全文大小：3653 K
• 卷排序：490

文摘

Interfacial interactions between foulants and membrane directly determine foulant adhesion and membrane fouling. In this study, surface of sludge foulant particles (flocs) was found to be rough, and could be modeled by a sinusoidal sphere function. A novel method, which combined surface element integration (SEI) method, differential geometry and composite Simpson’s rule, was developed to quantify the interfacial interactions between the modeled rough floc surface and membrane surface. Application of the novel method in a membrane bioreactor (MBR) provides broad profiles of quantitative interactions with rough floc surface with separation distance. It is also found that increase in the scaled amplitude of floc surface significantly reduced the interaction strength. Derjaguin’s approximation (DA) can be regarded as a special case of the novel method, indicating the extensive application prospect of the novel method. The novel method for interaction calculation was verified to be correct and feasible. Finally, roles of the novel method in membrane fouling research were discussed.