title: Influence of wastewater composition on nitrogen and phosphorus removal and process control in A2O process.
abstract: A bench-scale anaerobic-anoxic-oxic (A2O) bioreactor with steady denitrifying phosphorus removal performance was tested to determine the influence of influent C/N ratio (SCOD/TN) and C/P ratio (SCOD/TP) on biological nutrient removal for treating synthetic brewage wastewater; meanwhile, the spatial profiles of DO, pH and ORP sensors in such systems were investigated. The results showed that influent C/N ratio had significant effect on the TN, TP removal efficiencies and the ratio of anoxic to aerobic P uptake amount. The maximal TN and TP removal efficiencies could be achieved when influent C/N ratio was kept at about 7.1 and 5, respectively. Besides, the ratio of anoxic to aerobic P uptake amount was found to be linearly dependent on the influent C/N ratio with coefficient R2 of 0.685 when total recirculation ratio was constant at 3.5. Influent C/P ratio had an important effect on the TP removal efficiency, while it hardly affected TN removal efficiency. In addition, the TP removal efficiency reached the maximum for influent C/P ratio of 42. On the other hand, it was also found that the typical profiles of DO, pH and ORP sensors could be observed, and they have similar trends at the different influent C/N ratio and C/P ratio. It was suggested that the operational state could be well known according to the changes of simple on-line sensors.
authors.affiliation: Key Laboratory of Beijing for Water Environment Recovery, Beijing University of Technology, Pingleyuan 100, Chaoyang District, 100022, Beijing, People's Republic of China. wxl921@yahoo.com
authors.forename: Xiaolian
authors.initials: X
authors.lastname: Wang
authors.forename: Yongzhen
authors.initials: Y
authors.lastname: Peng
authors.forename: Shuying
authors.initials: S
authors.lastname: Wang
authors.forename: Jie
authors.initials: J
authors.lastname: Fan
authors.forename: Xuemei
authors.initials: X
authors.lastname: Cao
mesh_terms: D001421:Bacteria, Anaerobic / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D003198:Computer Simulation; D007220:Industrial Waste / Q000517:prevention & control*; D008954:Models, Biological; D009584:Nitrogen / Q000302:isolation & purification / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism; D010758:Phosphorus / Q000302:isolation & purification / Q000378:metabolism*; D018508:Water Purification / Q000379:methods*
chemical_list: D007220:Industrial Waste; D010758:Phosphorus; D009584:Nitrogen; D010100:Oxygen