title: Phosphorus removal and N₂O production in anaerobic/anoxic denitrifying phosphorus removal process: long-term impact of influent phosphorus concentration.
abstract: This study was conducted to investigate the long-term impact of influent phosphorus concentration on denitrifying phosphorus removal and N2O production during denitrifying phosphorous removal process. The results showed that, denitrifying phosphate accumulating organisms (DPAOs) could become dominant populations quickly in anaerobic/anoxic SBR by providing optimum cultivating conditions, and the reactor performed well for denitrifying phosphorus removal. The influent phosphorus concentration significantly affected anaerobic poly-β-hydroxyalkanoates (PHA) synthesis, denitrifying phosphorus removal, and N2O production during the denitrifying phosphorus removal process. As the influent phosphorus concentration was more than 20 mg L(-1), the activity of DPAOs began to be inhibited due to the transformation of the available carbon source type. Meanwhile, N2O production was inhibited with the mitigation of anoxic NO2(-)-N accumulation. Adoption of a modified feeding could enhance denitrifying phosphorus removal and inhibit N2O production during denitrifying phosphorous removal processes.
authors.affiliation: School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China. Electronic address: russellvanhalen@gmail.com.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Wang
authors.affiliation: School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Meng
authors.affiliation: School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China.
authors.forename: Ting
authors.initials: T
authors.lastname: Fan
authors.affiliation: College of Economics & Management, Anhui Agricultural University, Hefei 230036, China.
authors.forename: Yuneng
authors.initials: Y
authors.lastname: Du
authors.affiliation: School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Tang
authors.affiliation: School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China.
authors.forename: Shisuo
authors.initials: S
authors.lastname: Fan
mesh_terms: D000064:Acclimatization; D000332:Aerobiosis; D000693:Anaerobiosis; D061249:Batch Cell Culture Techniques; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology; D058440:Denitrification; D007700:Kinetics; D009566:Nitrates / Q000302:isolation & purification; D009573:Nitrites / Q000302:isolation & purification; D009609:Nitrous Oxide / Q000378:metabolism*; D010758:Phosphorus / Q000302:isolation & purification*; D054813:Polyhydroxyalkanoates / Q000096:biosynthesis; D012722:Sewage / Q000382:microbiology; D014865:Waste Disposal, Fluid; D018508:Water Purification / Q000379:methods*
chemical_list: D009566:Nitrates; D009573:Nitrites; D054813:Polyhydroxyalkanoates; D012722:Sewage; D010758:Phosphorus; D009609:Nitrous Oxide
keywords: Denitrifying phosphate accumulating organisms; Denitrifying phosphorus removal; Influent phosphorus concentration; N(2)O; Poly-β-hydroxyalkanoates (PHA)