好氧/缺氧循环SBR工艺的脱氮研究

当原水碱度不足时，针对SBR工艺，采用好氧／缺氧循环的运行方式进行脱氮性能及其过程控制的研究。结果表明，通过在线监测pH值的变化可以判断硝化反应过程中碱度是否充足、氨氮是否全部被氧化，相应的控制策略为：如果好氧／缺氧的循环次数超过2次，那么第一次硝化反应以pH值下降0．4～0．5来控制好氧时间，中间的每一次硝化反应以pH值下降0．8～1．0来控制好氧时间，最后一次硝化过程根据DO与pH值变化曲线上的跃升点控制反应时间；每次的缺氧反硝化都根据ORP与pH值曲线上拐点的出现来控制缺氧时间。与传统运行方式相比，采用好氧／缺氧循环运行方式及上述控制策略可使脱氮效率得到明显提高。

Study of Alternating Aerobic/Anoxic SBR Process for Nitrogen Removal

Under deficient source water alkalinity, the capabilities and the procedure of the alternating aerobic/anoxic SBR process for nitrogen removal were studied. Results show that the online monitoring of pH variations during nitrification can indicate whether the alkalinity is sufficient and whether all ammonia is oxidized. If the alternating aerobic/anoxic cycles surpass more than 2 times, the reaction time of the first nitrification is controlled with pH fall of 0.4 - 0.5, the reaction time of each middle nitrification is controlled with pH fall of 0.8 - 1.0, and the reaction time of the last nitrification is controlled with the breakpoints on DO and pH profiles. Each anoxic duration for denitrification is controlled with the breakpoints on ORP and pH profiles. Compared to the conventional SBR process, the alternating aerobic/ anoxic process based on the above control strategy can improve the nitrogen removal efficiency significantly.