期刊
BIORESOURCE TECHNOLOGY
卷 152, 期 -, 页码 7-14出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.10.096
关键词
Membrane fouling; Membrane bioreactor; XDLVO approach; Energy barrier; Osmotic pressure
资金
- National Natural Science Foundation of China [51108424, 21275130]
- Qianjiang Talent Project of Zhejiang Province [2012R10061]
- Zhejiang Provincial Natural Science Foundation of China [LY13E080011]
- National Undergraduate Training Programs for Innovation and Entrepreneurship [201210345021]
The effect of pH on membrane fouling in a submerged membrane bioreactor (MBR) was investigated in this study. It was found that, pH increase slightly increased the resistance of virgin membrane and fouled membrane. Pore clogging resistance was quite low, which was not apparently affected by the pH variation. Lower pH resulted in higher adherence of sludge flocs on membrane surface. Thermodynamic analysis showed that a repulsive energy barrier existed in the process of the foulants approaching to membrane surface. This energy barrier would decrease with pH decreased, suggesting the existence of a critical pH below which the repulsive energy barrier would disappear, which would facilitate attachment of the foulants. The resistance of the formed cake layer would significantly increase with the feed pH. This result could be explained by the osmotic pressure mechanism. The obtained findings also provided important implications for membrane fouling mitigation in MBRs. (C) 2013 Elsevier Ltd. All rights reserved.
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