title: Enhanced nutrient removal in a modified step feed process treating municipal wastewater with different inflow distribution ratios and nutrient ratios.
abstract: A pilot-scale modified step feed process was proposed to enhance organics and nutrient (N and P) removal performance from municipal wastewater. It combined University of Cape Town (UCT) and step feed process. Effects of inflow distribution ratios and nutrients ratios were investigated. The highest removal efficiencies of 89% for chemical oxygen demanding (COD), 88% for total nitrogen (TN) and 93% for phosphorus were obtained, respectively, at the inflow distribution ratio of 40:30:30%. The phosphorus removal exhibited an upward trend with the increasing of influent COD/P and TN/P, and the nitrogen removal had a positive correlation with influent COD/TN. In addition, aerobic simultaneous nitrification and denitrification and anoxic denitrifying phosphorus uptake made a distinct contribution to enhance nutrient removal. The proposed system was demonstrated to be an attractive enhanced biological nutrient removal process for wastewater treatment plants due to relatively high nutrient removal, robust sludge settleability and energy savings.
authors.affiliation: Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China. gl-222@tom.com
authors.forename: Shijian
authors.initials: S
authors.lastname: Ge
authors.forename: Yongzhen
authors.initials: Y
authors.lastname: Peng
authors.forename: Shuying
authors.initials: S
authors.lastname: Wang
authors.forename: Jianhua
authors.initials: J
authors.lastname: Guo
authors.forename: Bin
authors.initials: B
authors.lastname: Ma
authors.forename: Liang
authors.initials: L
authors.lastname: Zhang
authors.forename: Xu
authors.initials: X
authors.lastname: Cao
mesh_terms: D001673:Biodegradation, Environmental; D002947:Cities; D006863:Hydrogen-Ion Concentration; D009584:Nitrogen / Q000302:isolation & purification; D010100:Oxygen / Q000302:isolation & purification*; D010710:Phosphates / Q000302:isolation & purification; D010758:Phosphorus / Q000302:isolation & purification*; D010865:Pilot Projects; D000644:Quaternary Ammonium Compounds / Q000302:isolation & purification; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
chemical_list: D010710:Phosphates; D000644:Quaternary Ammonium Compounds; D010758:Phosphorus; D009584:Nitrogen; D010100:Oxygen