【摘要】 实验采用厌氧/缺氧/好氧（An/A/O）序批式反应器（SBR）,研究亚硝酸盐反硝化聚磷过程中NO和N₂O的积累和释放特征,以及不同pH值（6. 61和7. 37）对NO和N₂O产生量的影响。结果表明:试验条件下,亚硝酸盐反硝化聚磷过程存在高浓度NO和N₂O的积累,积累的NO对亚硝酸盐还原过程和NO还原过程均有明显的抑制作用。液相积累的NO导致溶解氧（DO）的升高,且NO和DO存在显著相关,推测一部分NO在反硝化过程中通过歧化反应生成N₂和O₂。pH值为6. 61和7. 37下,反硝化过程NO的释放因子分别为0. 86%和0. 58%,N₂O总产生量分别为30. 65,21. 24 mg/L。NO积累可能与厌氧期电子积累有关,N₂O积累主要与游离亚硝酸（FNA）抑制N₂O还原酶Nos活性有关。高pH值可有效减少NO和N₂O的产生和释放。更多还原

【Abstract】 Anaerobic/anoxic/aerobic（An/A/O） sequential batch reactor（SBR） was used to study the accumulation and release characteristics of NO and N₂O in the process of nitrite denitrifying phosphorus accumulation,and the effects of different pH values（6. 61 and 7. 37） on the production of NO and N₂O. The results showed that there was accumulation of high concentration of NO and N₂O in the denitrifying phosphorus accumulation process of nitrite under the experimental conditions,and the accumulated NO had obvious inhibitory effect on the reduction process of nitrite and the reduction process of NO. The accumulation of NO in the liquid phase led to the increase of dissolved oxygen（DO）,and there was a significant correlation between NO and DO. It was speculated that part of NO generated nitrogen and oxygen through the disproportionation reaction in the denitrification process. The release factors of NO in the denitrification process under pH values of 6. 61 and 7. 37 were0. 86% and 0. 58%,and the total production of N₂O was 30. 65 and 21. 24 mg/L,respectively. NO accumulation might be related to the anaerobic electron accumulation,and N₂O accumulation was mainly related to the inhibition of Nos activity by free nitrite（FNA）. High pH value could effectively reduce the production and release of NO and N₂O.更多还原