短程硝化反应器的快速启动与运行特性

Start-up and operation of partial nitrification in a sequencing batch reactor

为了探讨快速启动和运行特性，以硝化污泥接种序批式反应器，在纯自养条件下利用短程硝化处理高NH4^＋-N废水。实验结果表明，控制溶解氧（dissoled oxygen，DO）浓度为0．5mg／L、游离氨浓度11．8～49．1mg／L时，反应器的启动在第13d完成。在曝气量为800mL／min时，利用pH与DO的变化趋势来判断氨氧化进程，控制每周期曝气时间为6．0h，反应器稳定运行了101个周期。NH4^＋-N平均去除率为82．6％，NH4^＋-N去除负荷最大为0．97kg／（m3·d），NO2^--N平均累积率达97．2％，NO3^--N浓度小于10mg／L。在反应器中利用纯自养微生物可以长期稳定地实现短程硝化反应。

The rapid start up and operation of a sequencing batch reactor for partial nitrification were investigated to treat high ammonium wastewater. The reactor was inoculated with nitrifying sludge and the partial nitrification realized by using complete autotrophic bacteria. The experimental results showed that for dissolved oxygen 0.5 mg/L and free ammonia concentrations 11, 8 49.1 mag/L, the start-up could be completed within 13 days. The pH and dissolved oxygen concentrations were varied to monitor the effect on the ammonium oxidation process with stable partial nitrification maintained for 101 cycles. The NH4^＋-N removal efficiency was 82.6%, NO2^--N accumulation rate reached 97.20% and the maximum NH4^＋- N removal loading was 0. 97 kg/（ma · d）. The partial nitrification was stable for long term operation with complete autotrophic bacteria in the reactor.