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Influence of mechanical mixing rates on sludge characteristics and membrane fouling in MBRs

journal contribution
posted on 2008-01-01, 00:00 authored by S Khan, C Visvanathan, Veeriah Jegatheesan, R BenAim
The influence of shear intensity (G) induced by mechanical mixing on activated sludge characteristics as well as membrane fouling propensity in membrane bioreactors (MBRs) was investigated. Four MBRs were operated at different mechanical mixing conditions. The control reactor (MBR0) was operated with aeration only supplemented by mechanical stirring at 150, 300, and 450 rpm in MBR150, MBR300, and MBR450, respectively. It was found that the MBR300 demonstrated minimum rate of membrane fouling. The fouling potential of the MBR300 mixed liquor was lowest characterized by the specific cake resistance and the normalized capillary suction time (CSTN). Moreover, it was found that the mean particle size reduced with an increase in the shear intensity. These results reveal that membrane fouling can be significantly mitigated by appropriate shear stress on membrane fibers induced by mechanical mixing condition.

History

Journal

Separation science and technology

Volume

43

Issue

7

Pagination

1826 - 1838

Publisher

Taylor & Francis Inc.

Location

Philadelphia, P.a.

ISSN

0149-6395

eISSN

1520-5754

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

Taylor & Francis Group, LLC

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