title: Two-stage biofilm-MBR for nitrogen removal and enhanced membrane performance.
abstract: 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.
authors: Department of Hydraulic and Environmental Engineering, Norwegian University of Science and Technology, Norway. cheng.sun@ntnu.no
authors: Cheng
authors: C
authors: Sun
authors: Torove
authors: T
authors: Leiknes
mesh_terms: D001673:Biodegradation, Environmental; D018441:Biofilms; D057219:Biofouling; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology*; D005374:Filtration / Q000295:instrumentation; D008567:Membranes, Artificial; D009584:Nitrogen / Q000302:isolation & purification*; D009930:Organic Chemicals / Q000032:analysis; D010539:Permeability; D010865:Pilot Projects; D011312:Pressure; D059027:Recycling; D012996:Solutions; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D018508:Water Purification / Q000295:instrumentation* / Q000379:methods*; D060753:Water Quality
chemical_list: D008567:Membranes, Artificial; D009930:Organic Chemicals; D012996:Solutions; D014874:Water Pollutants, Chemical; D009584:Nitrogen