title: Treatment of municipal wastewater using a contact oxidation filtration separation integrated bioreactor.
abstract: A new contact oxidation filtration separation integrated bioreactor (CFBR) was used to treat municipal wastewater. The CFBR was made up of a biofilm reactor (the upper part of the CFBR) and a gravitational filtration bed (the lower part of the CFBR). Polyacrylonitrile balls (50mm diameter, 237 m(2)/m(3) specific surface, 90% porosity, and 50.2% packing rate) were filled into the biofilm reactor as biofilm attaching materials and anthracite coal (particle size 1-2mm, packing density 0.947 g/cm(3), non-uniform coefficient (K(80)=d(80)/d(10))<2.0) was placed into the gravitational filtration bed as filter media. At an organic volumetric loading rate of 2.4 kg COD/(m(3)d) and an initial filtration velocity of 5m/h in the CFBR, the average removal efficiencies of COD, ammonia nitrogen, total nitrogen and turbidity were 90.6%, 81.4%, 64.6% and 96.7% respectively, but the treatment process seemed not to be effective in phosphorus removal. The average removal efficiency of total phosphorus was 60.1%. Additionally, the power consumption of the CFBR was less than 0.15 kWh/m(3) of wastewater treated, and less than 1.5 kWh/kg BOD(5) removal.
authors.affiliation: Department of Municipal Engineering, School of Civil Engineering, Wuhan University, No. 8 South Donghu Road, Wuhan 430072, PR China. lizhenhua11111@yahoo.cn
authors.forename: Z H
authors.initials: ZH
authors.lastname: Li
authors.forename: K
authors.initials: K
authors.lastname: Yang
authors.forename: X J
authors.initials: XJ
authors.lastname: Yang
authors.forename: L
authors.initials: L
authors.lastname: Li
mesh_terms: D000180:Acrylic Resins; D000332:Aerobiosis; D000641:Ammonia; D019149:Bioreactors; D005374:Filtration / Q000379:methods*; D009584:Nitrogen; D010100:Oxygen; D010758:Phosphorus; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
chemical_list: D000180:Acrylic Resins; C010504:polyacrylonitrile; D010758:Phosphorus; D000641:Ammonia; D009584:Nitrogen; D010100:Oxygen