Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan, 250100, Shandong, China.
Environ Sci Pollut Res Int. 2013 Aug;20(8):5353-60. doi: 10.1007/s11356-013-1530-3. Epub 2013 Feb 14.
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 %.
尽管反硝化除磷工艺具有许多优点，但该工艺会产生大量的氧化亚氮（N2O），这是一种强效温室气体，这仍是该创新且有前景的工艺所面临的一个问题。为了更好地了解和更有效地控制反硝化除磷工艺中 N2O 的生成，进行了批处理实验，以研究 N2O 生成的主要原因，并在此基础上提出了控制措施。结果表明，反硝化除磷工艺中 N2O 的生成量占总氮去除量的 0.41%，而在传统的反硝化过程中几乎没有生成 N2O。进一步的研究表明，N2O 还原酶对电子的弱竞争和亚硝酸盐的高积累是 N2O 生成的两个主要原因，这可以通过不同条件下 N2O 的产生和还原速率得到证明。因此，通过两种控制措施成功地降低了 N2O 的生成：（1）连续添加硝酸盐，可将 N2O 的生成量减少约 91.4%；（2）使用丙酸作为碳源，可将 N2O 的生成量减少约 69.8%。
