Nitrous oxide generation in denitrifying phosphorus removal process: main causes and control measures

作者：Li Cong; Zhang Jian; Liang Shuang^*; Ngo Huu Hao; Guo Wenshan; Zhang Yingying; Zou Yina

来源：Environmental Science and Pollution Research, 2013, 20(8): 5353-5360.

DOI：10.1007/s11356-013-1530-3

• Nitrous oxide
• Denitrifying phosphorus removal
• Causes
• Control measures
• Continuous nitrate addition
• Propionate

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 %.

• 出版日期2013-8
• 单位山东大学