Comparison between a moving bed membrane bioreactor and a conventional membrane bioreactor on membrane fouling |
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| Authors: | Shuai Yang Fenglin Yang Zhimin Fu Ruibo Lei |
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| Affiliation: | aKey Laboratory of Industrial Ecology and Environmental Engineering, MOE, School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, PR China;bState Key Laboratory of Coastal and Offshore Engineering, School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, PR China |
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| Abstract: | A membrane bioreactor filled with carriers instead of activated sludge named a moving bed membrane bioreactor (MBMBR) was investigated to minimize the effect of suspended solids on membrane fouling. The MBMBR and a conventional membrane bioreactor (CMBR) were operated in parallel for about two months. Unexpectedly, the rate of membrane fouling in MBMBR was about three times of that in CMBR. MBMBR showed a higher cake layer resistance than CMBR due to plenty of filamentous bacteria inhabited in suspended solids in MBMBR. Protein and polysaccharide contents of soluble EPS in MBMBR were obviously larger than those in CMBR. It could be speculated that the overgrowth of filamentous bacteria in MBMBR resulted in severe cake layer and induced a large quantity of EPS, which deteriorated the membrane fouling. |
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| Keywords: | Moving bed membrane bioreactor (MBMBR) Conventional membrane bioreactor (CMBR) Membrane fouling Filamentous bacteria Extracellular polymeric substances (EPS) |
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