title: Influence of organic shock loads on the production of N₂O in denitrifying phosphorus removal process.
abstract: In this work, the influences of short-term organic shock loads on N₂O production during denitrifying phosphorus removal were investigated by changing the influent COD concentrations (100, 200, 350, and 500 mg/L). After switching the COD concentrations from 200 to 350 or 500 mg/L, N₂O-N production amount increased from 1.62% to 7.12% or 3.29% of the TN removal, respectively, while the corresponding effluent phosphorus concentrations increased from 1.84 to 16.55 and 56.08 mg/L, respectively, which were higher than the influent phosphorus concentration (4.93 mg/L). Furthermore, when the COD concentration was decreased to 100 mg/L, N₂O-N production amount was only 1.20%. All results suggested that higher organic shock loads increased N₂O production. The main reason was that higher organic shock loads increased anaerobic poly-β-hydroxyalkanoates (PHA) synthesis, which resulted in higher nitrite accumulation. The influences of higher organic shock loads on N₂O production could be minimized by adopting continuous nitrate addition strategy.
authors.affiliation: Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 27 Shanda Nanlu, Jinan 250100, Shandong, PR China.
authors.forename: Cong
authors.initials: C
authors.lastname: Li
authors.forename: Ting
authors.initials: T
authors.lastname: Wang
authors.forename: Nan
authors.initials: N
authors.lastname: Zheng
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.forename: Huu Hao
authors.initials: HH
authors.lastname: Ngo
authors.forename: Wenshan
authors.initials: W
authors.lastname: Guo
authors.forename: Shuang
authors.initials: S
authors.lastname: Liang
mesh_terms: D058440:Denitrification; D009566:Nitrates / Q000737:chemistry; D009589:Nitrogen Oxides / Q000737:chemistry*; D010758:Phosphorus / Q000032:analysis / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry; D018508:Water Purification / Q000379:methods
chemical_list: D009566:Nitrates; D009589:Nitrogen Oxides; D010758:Phosphorus; D062065:Wastewater