标题：Influence of organic shock loads on the production of N2O in denitrifying phosphorus removal process
作者：Li, Cong ;Wang, Ting ;Zheng, Nan ;Zhang, Jian ;Ngo, Huu Hao ;Guo, Wenshan ;Liang, Shuang
作者机构：[Li, Cong ;Zheng, Nan ;Zhang, Jian ;Liang, Shuang ] Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Enviro 更多
摘要：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 500mg/L). After switching the COD concentrations from 200 to 350 or 500mg/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 56.08mg/L, respectively, which were higher than the influent phosphorus concentration (4.93mg/L). Furthermore, when the COD concentration was decreased to 100mg/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. © 2013 Elsevier Ltd.