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

Jamal Khan, S., Visvanathan, C., Jegatheesan, V., and BenAim, R. (2008) Influence of mechanical mixing rates on sludge characteristics and membrane fouling in MBRs. Separation Science and Technology, 43 (7). pp. 1826-1838.

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Abstract

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.

Item ID: 7124
Item Type: Article (Refereed Research - C1)
Keywords: membrane fouling; shear intensity; partical size distribution; extracellular polymetric substances (EPS); specific cake resistance
ISSN: 1520-5754
Date Deposited: 06 Apr 2010 22:24
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070401 Aquaculture @ 50%
09 ENGINEERING > 0904 Chemical Engineering > 090404 Membrane and Separation Technologies @ 40%
09 ENGINEERING > 0904 Chemical Engineering > 090409 Wastewater Treatment Processes @ 10%
SEO Codes: 96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961102 Physical and Chemical Conditions of Water in Coastal and Estuarine Environments @ 80%
96 ENVIRONMENT > 9609 Land and Water Management > 960903 Coastal and Estuarine Water Management @ 20%
Citation Count from Web of Science Web of Science 5
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