短程硝化过程中NO-2-N高效富集的工艺条件实验研究

针对厌氧氨氧化工艺需要提供充足的亚硝酸盐氮为电子受体的问题，利用培养基对SBR中具有一定短程硝化功能的污泥进行富集培养，得到氨氧化菌和亚硝酸盐氧化菌的数量之比为104︰1，并研究了工艺条件对短程硝化的影响，结果表明，适合氨氧化菌生长的最佳温度为30℃、pH为7.5、nHCO^-₃/nNH⁺₄-N值为1。以适合氨氧化菌生长的最佳环境条件优化SBR，在进水氨氮浓度为250 mg/L时，氨氮的转化率达到90％以上，亚硝酸盐氮积累率维持在85％以上，反应器中氨氧化菌与亚硝酸盐氧化菌的数量之比为10³∶1，亚硝酸盐的高效积累为厌氧氨氧化工艺处理高氨废水的过程提供了稳定的电子受体。

Effects of operating conditions on shortcut nitrification process

To provide sufficient nitrite as electron acceptor for Anammox process,the effects of operating conditions on shortcut nitrification were investigated in an SBR.Culture medium was used for enrichment of ammonium-oxidizing bacteria(AOB) inoculated from SBR,the AOB and nitrite-oxidizing bacteria(NOB) was present in a quantitative ratio of 104:1.Operating conditions of shortcut nitrification were investigated,the optimal temperature of 30 ℃,pH of 7.5~8 and nHCO-3/nNH+4-N of 1 were gained for the growth of AOB.The SBR was optimized according to the optimal conditions,and 90% of ammonia removal efficiency and above 85% of nitrite accumulation efficiency were reached respectively when the influent ammonia concentration was 250 mg/L.The quantity of AOB and NOB was in a ratio of 103∶ 1.Sufficient nitrite was provided as stable electron acceptor for the subsequent Anammox process for high ammonia concentration wastewater treatment.