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Water Science & Technology Vol 66 No 3 pp 588–593 © IWA Publishing 2012 doi:10.2166/wst.2012.211 Two-stage biofilm-MBR for nitrogen removal and enhanced membrane performanceCheng Sun and TorOve LeiknesDepartment of Hydraulic and Environmental Engineering, NTNU - Norwegian University of Science and Technology, S.P. Andersensvei 5, N-7491 Trondheim, Norway E-mail: cheng.sun@ntnu.noABSTRACT A two-stage biofilm-membrane bioreactor (MBR) was developed in this study. High total nitrogen removal (maximum: 81.4% with recycle ratio = 3.5) was observed by recycling the suspension liquid between an anaerobic FBBR and an aerobic MBBR. Very low (less than 60 mg/L) suspended solids was kept in the membrane unit, which could improve the membrane filtration performance. Membrane fouling was further reduced by increasing the recycle ratio. When influent organic load increased, the membrane fouling rate increased, coupling with higher FCOD and suspended solids (SS) values in the feed solution around the membrane. Keywords: biofilm-MBR; FCOD; membrane; recycle ratio; TN eProduct: Buy this article for £24.00 (IWA MEMBER PRICE: £18.00) All prices include VAT. For customers where VAT should not be applied, the VAT amount will be removed upon payment |
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