期刊
BIORESOURCE TECHNOLOGY
卷 146, 期 -, 页码 7-14出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.07.040
关键词
Membrane bioreactor; Membrane fouling; XDLVO theory; Energy barrier; Short-range interactions
资金
- National Natural Science Foundation of China [51108424, 21107099, 21003109]
- Qianjiang Talent Project of Zhejiang Province [2012R10061]
- Open Project of Zhejiang Provincial Key Laboratory for Environmental Pollution Control Research
- Zhejiang Provincial Natural Science Foundation of China [LY13E080011, LQ12B05002]
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. (c) 2013 Elsevier Ltd. All rights reserved.
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