Thermodynamic analysis of membrane fouling in a submerged membrane bioreactor and its implications
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- 作者：Huachang Hong ; Wei Peng ; Meijia Zhang ; Jianrong Chen ; Yiming He ; Fangyuan Wang ; Xuexiang Weng ; Haiying Yu ; Hongjun Lin
- 关键词：Membrane bioreactor ; Membrane fouling ; XDLVO theory ; Energy barrier ; Short-range interactions
- 刊名：Bioresource Technology
- 出版年：2013
- 出版时间：October, 2013
- 年：2013
- 卷：146
- 期：Complete
- 页码：7-14
- 全文大小：1158 K
文摘
The thermodynamic interactions between membrane and sludge flocs in a submerged membrane bioreactor (MBR) were investigated. It was found that Lewis acid-base (AB) interaction predominated in the total interactions. The interaction energy composition of membrane-sludge flocs combination was quite similar to that of membrane-bovine serum albumin (BSA) combination, indicating the critical role of proteins in adhesion process. Detailed analysis revealed the existence of a repulsive energy barrier in membrane-foulants interaction. Calculation results demonstrated that small flocs possessed higher attractive interaction energy per unit mass, and therefore adhered to membrane surface more easily as compared to large flocs. Meanwhile, initial sludge adhesion would facilitate the following adhesion due to the reduced repulsive energy barrier. Membrane with high electron donor surface tension component was a favor option for membrane fouling abatement. These findings offered new insights into membrane fouling, and also provided significant implications for fouling control in MBRs.