Journal
BIORESOURCE TECHNOLOGY
Volume 156, Issue -, Pages 35-41Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.01.014
Keywords
Membrane fouling; Membrane bioreactor; Critical ionic strength; Energy barrier
Funding
- National Natural Science Foundation of China [51108424, 21107099, 21275131, 21275130]
- Qianjiang Talent Project of Zhejiang Province [2012R10061]
- Zhejiang Provincial Natural Science Foundation of China [LY13E0 80011]
- Zhejiang Provincial Environmental Protection Scientific Research Project [2013A024, 2013A025]
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In this study, the effects of ionic strength on membrane fouling in a membrane bioreactor (MBR) were investigated. Ionic strength in range of 0.005-0.05 mol/L exerted no apparent impacts on the resistance of virgin membrane, fouled membrane and pore clogging. Thermodynamic analysis showed existences of a secondary energy minimum and an energy barrier in the process of the sludge flocs approaching to membrane surface. Increase in ionic strength could significantly reduce the energy barrier. It was revealed that there existed a critical ionic strength above that the energy barrier would disappear, facilitating adhesion of the foulants. Cake resistance was not significantly affected by the ionic strength, but highly depended on SMP in supernatant. The high cake resistance caused by SMP could be explained by the osmotic pressure mechanism. The obtained results provided new insights into membrane fouling in MBRs. (C) 2014 Elsevier Ltd. All rights reserved.
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