Abstract：In this study, the effect of nitrite on N2O reduction during denitrification using external carbon sources was investigated in batch tests. The results showed that N2O accumulation grew with increase of the initial nitrite concentration at levels of 5.92~35.23mg/L. Specially, when NO2--N was 35.23mg/L, the N2O produced accounted for 46.26% of the total reduced nitrite. By contrast, the N2O accumulation during denitrification was attributed to the decrease of specific reduction rate due to the synergistic reactionof the free nitrous acid (FNA) inhibition and the electron competition between N2O reductase and nitrite reductase. These findings suggest that the N2O emission control could be achieved by decreasing nitrite concentration through the operation optimization. Moreover, N2O could be used to oxidize methane for increasing energy production by 37% and reducing N2O emission, which could be achieved by increasing nitrite concentration via nitritation.
委燕, 王淑莹, 马斌, 李夕耀, 何岳兰, 彭永臻. 亚硝酸盐对外碳源反硝化过程N2O还原的影响[J]. 中国环境科学, 2014, 34(7): 1722-1727.
WEI Yan, WANG Shu-Ying, MA Bin, LI Xi-Yao, HE Yue-Lan, PENG Yong-Zhen. The effect of nitrite on N2O reduction during denitrification process using external carbon source. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(7): 1722-1727.
