葡萄糖碳源条件下C/N对反硝化和N_(2)O释放性能的影响

Effect of C/N on denitrification and N_(2)O release with glucose as the carbon source

以NO3--N或者NO2--N为电子受体,以葡萄糖为碳源,通过批次实验研究了反硝化过程中在不同C/N条件下,反应器内的脱氮和N2O的释放情况。结果表明:当C/N在1.5、3、6.5、10和20变化的过程中,以NO3--N为电子受体时,反硝化速率由8.81×10-3g·(g·h)^(-1)升至3.25×10^(-2)g·(g·h)^(-1),峰值N2O转化率由3.43%升至17.43%;以NO2--N为电子受体时,反硝化速率由1.59×10^(-2)g·(g·h)^(-1)升至8.08×10^(-2)g·(g·h)^(-1),峰值N2O转化率由4.08%升至41.17%。增大C/N可提供更多的电子进行反硝化,使其脱氮效率得到提高。N2O积累量的增加除了与反硝化过程中各种酶的电子竞争有关,也与葡萄糖相对复杂的代谢过程有关。

In this study,NO3--N or NO2--N was used as the electron acceptor,glucose was used as the carbon source,batch experiments were conducted to investigate the denitrification and N2O release in the reactor under different C/N conditions during the denitrification process.The results showed that when the C/N increased along 1.5,3,6.5,10 and 20 with NO3--N as the electron acceptor,the denitrification rate increased from8.81×10-3 g·(g·h)^(-1)to 3.25×10^(-2)g·(g·h)^(-1),the peak N2O conversion rate increased from 3.43%to 17.43%;while with NO2--N as the electron acceptor,the denitrification rate increased from 1.59×10^(-2)g·(g·h)^(-1)to 8.08×10^(-2)g·(g·h)^(-1),the peak N2O conversion rate increased from 4.08%to 41.17%.Increasing C/N could provide more electrons for denitrification and improve the denitrification efficiency.The increase in N2O accumulation was not only related to the electronic competition of various enzymes in the denitrification process,but also related to the complex metabolism process of glucose.