A study on submerged rotating MBR for wastewater treatment and membrane cleaning

Dan-Ying Zuo; Hong-Jun Li; Hong-Tao Liu; Gui-Ping Wu

Korean Journal of Chemical Engineering, Vol.27, No.3, 881-885, March, 2010

DOI10.1007/s11814-010-0123-9 Export Citation

A study on submerged rotating MBR for wastewater treatment and membrane cleaning

Dan-Ying Zuo^†, Hong-Jun Li¹, Hong-Tao Liu, and Gui-Ping Wu²

Key Lab for Green Processing and Functional Textile of New Textile Materials (Ministry of Education), Wuhan University of Science and Engineering, Wuhan, 430073, P. R. China
¹Department of Industrial Engineering, Wuhan University of Science and Engineering, Wuhan, 430073, P. R. China
²Key Laboratory for Catalysis and Material Science of Hubei Province, South-Central University for Nationalities, Wuhan, 430074, P. R. China

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A submerged rotating membrane bioreactor (SRMBR), with a rotatable, rounded, flat-sheet Poly(vinyldiene fluoride) (PVDF) membrane module fixed on hollow axes and moved by an electromotor, was used for wastewater reclamation. It was found that the effluent COD became stable and lower than 20 mg/L after one day running. The equilibrium permeate flux increased from 42.5 to 47.5 L/m2·h with the rotation speed increasing from 15 r/min to 25 r/min. Prolonging relaxation time could alleviate membrane fouling and enhance the flux. Finally, membrane cleaning was studied. The results showed that flushing the membrane surface with water, water/NaOH and water/NaOH/HCl recovered permeate flux to 48.4%, 83.5% and 90.2% of that of the initial operation, respectively.

Keywords:Submerged Rotating MBR;Rotation Speed;Permeate Flux;Membrane Cleaning;PVDF Flat-sheet Composite Membrane

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