title: Characteristics of nitrogen and phosphorus removal in a sequencing batch reactor.
abstract: Laboratory scale experiments were conducted to study the characteristics of N and P removal under different influent organic carbon concentration in a sequencing batch reactor (SBR) with simple anaerobic/aerobic operating mode. Experimental results indicated that, under the operating condition of influent N concentration of 89 mg/L and P concentration of 15 mg/L, when the influent C/N ratio increased from 1.5 to 6.9 (influent C/P ratio from 9 to 41), total N and P removal efficiency improved from 50% and 46% to 78% and 96% respectively. Track studies of N, P and other operating parameters demonstrated that N removal of the SBR was realized through simultaneous nitrification and denitrification (SND) in the aeration phase and anoxic denitrificaiton in the filling phase, P removal was accomplished through conventional anaerobic P release and aerobic P taken-up process. Keeping dissolved oxygen (DO) concentration during the first two aeration hours as low as 0.1-0.6 mg/L is essential for the simultaneous occurrences of nitrification, denitrification and P-taken up.
authors.affiliation: School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China.
authors.forename: Haiyan
authors.initials: H
authors.lastname: Guo
authors.affiliation: Department of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
authors.forename: Jiti
authors.initials: J
authors.lastname: Zhou
authors.affiliation: School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China.
authors.forename: Shoutong
authors.initials: S
authors.lastname: Zhang
authors.affiliation: School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Guo
mesh_terms: D061249:Batch Cell Culture Techniques / Q000295:instrumentation* / Q000379:methods*; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D009584:Nitrogen / Q000302:isolation & purification*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000032:analysis; D010758:Phosphorus / Q000302:isolation & purification*
chemical_list: D010758:Phosphorus; D009584:Nitrogen; D010100:Oxygen