【摘要】 以普通活性污泥为种泥,控制COD/N为2,通过逐步提升NO₂^--N浓度（由15上升至200mg/L）的方式在小试SBR反应器中实现了短程反硝化的启动;稳定运行期间,NO₂^--N的平均去除率达99.5%.在此基础上,通过批式试验考察了不同进水pH值（7.1、8.2和9.3）对短程反硝化及N₂O释放特性的影响.结果表明,随着进水pH值的升高,平均反硝化速率由0.087 9上升至0.094 1和0.107 2 mg/（min·gSS）;反硝化效率先降后升,分别为98.70、96.52和99.10%;而N₂O的释放量随pH值升高呈降低的趋势,pH值为7.1时的释放量分别是8.2和9.3时的2.82和8.04倍.因此,适当提升进水pH值可大幅降低短程反硝化过程N₂O的释放量.更多还原

【Abstract】 Shortcut denitrification was successfully started up in a sequencing batch reactor（SBR） by evaluating nitrite nitrogen concentration from 15 to 200 mg/L. Batch experiments were conducted to investigate the effect of pH values（7.1, 8.2 and 9.3） on the denitrification rate and nitrous oxide（N₂O） emission. The results show that the nitrite removal rate increased from 0.087 9 to 0.094 1 and 0.107 2 mg/（min·gSS）, and then decreased with the increase of pH. While the removal efficiency of nitrite firstly decrease from 98.70 to 96.52 and then increased to 99.10%. The amount of N₂O emission decreased with the increase of pH values, and the N₂O emission amount at pH 7.1 was 7.04 times more than that at pH 9.3. The results demonstrated that the N₂O emission can be decreased significantly by increasing the influent pH value during shortcut denitrification.更多还原