title: Nitrous oxide generation in denitrifying phosphorus removal process: main causes and control measures.
abstract: Despite the many benefits of denitrifying phosphorus removal process, the significant generation of nitrous oxide (N2O), a potent greenhouse gas, remains a problem for this innovative and promising process. To better understand and more effectively control N2O generation in denitrifying phosphorus removal process, batch experiments were carried out to investigate the main causes of N2O generation, based on which the control measures were subsequently proposed. The results showed that N2O generation accounted for 0.41 % of the total nitrogen removal in denitrifying phosphorus removal process, whereas, in contrast, almost no N2O was generated in conventional denitrification process. It was further demonstrated that the weak competition of N2O reductase for electrons and the high nitrite accumulation were the two main causes for N2O generation, evidenced by N2O production and reduction rates under different conditions. Accordingly, the reduction of N2O generation was successfully achieved via two control measures: (1) the use of continuous nitrate addition reducing N2O generation by around 91.4 % and (2) the use of propionate as the carbon source reducing N2O generation by around 69.8 %.
authors: Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan, 250100, Shandong, China.
authors: Cong
authors: C
authors: Li
authors: Jian
authors: J
authors: Zhang
authors: Shuang
authors: S
authors: Liang
authors: Huu Hao
authors: HH
authors: Ngo
authors: Wenshan
authors: W
authors: Guo
authors: Yingying
authors: Y
authors: Zhang
authors: Yina
authors: Y
authors: Zou
mesh_terms: D000393:Air Pollutants / Q000032:analysis* / Q000378:metabolism; D001419:Bacteria / Q000378:metabolism; D019149:Bioreactors; D058440:Denitrification; D009566:Nitrates / Q000378:metabolism; D009609:Nitrous Oxide / Q000032:analysis* / Q000378:metabolism; D010758:Phosphorus / Q000378:metabolism*; D011422:Propionates / Q000378:metabolism; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D000393:Air Pollutants; D009566:Nitrates; D011422:Propionates; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D009609:Nitrous Oxide