C/N比和曝气量影响MBR同步硝化反硝化的研究

Study on effects of C/N ratio and aeration rate on the simultaneous nitrification and denitrification(SND) in MBR

通过连续运行MBR研究了C／N比和曝气量对同步硝化反硝化的影响，结果表明，在环境温度13—23℃，MLSS为6．0～6．8g／L，进水NH4^-N浓度50mg／L，曝气量0．5m^3／h，HRT为6h实验条件下，总氮去除率随着进水C／N比的增加而增加，在C／N比为6：1～8：1时，TN去除率达到79％～89％，低的C／N比抑制反硝化，过高的C／N比增加了碳源补加的成本。改变反应曝气量，当C／N比为6：1，曝气量为0．4m^3／h时，TN的去除率达到了最大值85％。曝气量过高或过低，TN去除率均下降。并对在不同曝气量下MBR内的DO值分布进行了初步研究。

The effects of C/N ratio and aeration rate on the simultaneous nitrification and denitrifieation （SND） in MBR were studied. Under the experimental conditions of ambient temperaturel3- 23 ℃ , MLSS 6.0 -6.8 mg/L, aeration rate 0.5 m3/h and HRT 6 h, with the NH4^＋ -N concentration in influent of 50 mg/L, the removal efficiency of TN was improved with the increasing C/N ratio. When the C/N ratios were from 6：1 to 8： 1, the removal rate of TN reached from79% to 89%. The denitrification was inhibited at low C/N ratio and adding carbon source caused cost at high C/N. When other conditions were controlled the same as before, the removal rate of TN reached 85% when aeration rate was 0.4 m^3/h with C/N ratio of 6： 1. The removal rate of TN decreased with a higher or lower aeration rate. Furthermore, the distributions of DO in MBR were studied primarily.