A／O短程硝化反应器处理高浓氨氮废水的SND

Study on SND in A/O Shortcut Nitrification Reactor for Treatment of High-concentration Ammonia Nitrogen Wastewater

以垃圾渗滤液的UASB处理出水为研究对象，考察了A／O短程硝化反应器的同步硝化反硝化（SND）效果。当DO为2～5mg／L时，SND对TN的去除率为5％～30％，去除的TN大致等于硝化过程中减少的TKN与产生的NOx^--N的差值。C／N是影响SND去除总氮的决定性因素，随着C／N的提高，对TN的去除率增加。在进水C／N相同的情况下，短程硝化提高了SND对TN的去除率。活性污泥密实的结构和好氧颗粒污泥的存在，可能是发生SND现象的重要原因。

The simultaneous nitrification and denitrification （SND） in A/O shortcut nitrification reactor was investigated using effluent from UASB treating landfill leachate. When DO is between 2 to 5 mg/L, the TN removal rate by SND is 5% to 30%. The TN removal amount is equal to the difference between TKN removal amount and NOx^- - N production amount during nitrification. C/N is the decisive factor of TN removal by SND. With increase of the ratio of C/N, the TN removal rate also rises proportionally. Under the same influent C/N ratio, the shortcut nitrification improves the TN removal rate. The compact structure of activated sludge and aerobic granular sludge in the reactor are probably a major reason for SND occurence.