title: A cascade of anoxic and oxic fluidized bed biofilm reactors for treatment of synthetic municipal wastewater.
abstract: In this study, a cascade of anoxic and oxic fluidized bed biofilm reactors system was carried out to treat synthetic municipal wastewater. The parameters of the influent flow rates and C/N ratios were discussed. System performance was acceptable for chemical oxygen demand (COD), ammonia, and total nitrogen removal. A decrease of ammonia and total nitrogen removal efficiencies, however, was observed when the influent flow rates increased to 5.04 and 6.12 1 h(-1). Total nitrogen removal decreased at the influent C/N ratio of 3:1. The measured ratios of COD reduction in the anoxic column to nitrogen removal through nitrification-denitrification were 3.7, 3.5, 3.3, and 3.1 g COD/g(-1) N on average when the influent C/N ratios changed from 6:1 to 3:1. The observed sludge yield (Yobs) was 0.169 g VSS g COD(-1) because of perfect denitrification in the anoxic column and the relatively long solids retention time.
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing University of Technology, Nanjing, P R China.
authors.forename: Y W
authors.initials: YW
authors.lastname: Chen
authors.forename: J M
authors.initials: JM
authors.lastname: Wang
authors.forename: C L
authors.initials: CL
authors.lastname: Zang
authors.forename: Q
authors.initials: Q
authors.lastname: Huang
authors.forename: M Q
authors.initials: MQ
authors.lastname: Liu
authors.forename: S M
authors.initials: SM
authors.lastname: Zhu
authors.forename: S B
authors.initials: SB
authors.lastname: Shen
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D018441:Biofilms; D019149:Bioreactors; D017672:Nitrogen Compounds; D010100:Oxygen / Q000378:metabolism*; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification
chemical_list: D017672:Nitrogen Compounds; D014874:Water Pollutants, Chemical; D010100:Oxygen