碳氮比与氨氮负荷对序批式活性污泥法同步硝化反硝化的影响

Effect of carbon-to-nitrogen mass ratio and ammonium nitrogen loading rate on simultaneous nitrification and denitrification by using sequencing batch reactor

为了提高生物脱氮的效率,研究采用序批式活性污泥法(SBR工艺)考察碳氮质量比w(C/N)与氨氮负荷对同步硝化反硝化的影响。结果表明:当w(C/N)为5.6,氨氮负荷为0.024 g/(g.d),碳源快速消耗,SBR工艺较难实现同步硝化反硝化,同步硝化反硝化率只能够达到0.76%。当w(C/N)为10.5,氨氮负荷为0.024 g/(g.d)时,SBR系统能够实现同步硝化反硝化,同步硝化反硝化率达到97.6%,NH4+-N和COD去除率均接近100%;当w(C/N)为16.3,氨氮负荷为0.024 g/(g.d)时,同步硝化反硝化率为94.5%,增加外加碳源的成本。同步硝化反硝化可以取代二段独立的硝化和反硝化过程,节省运行费用。

In order to improve the efficiency of biological denitrification, the effect of carbon-to-nitrogen mass ratio w （C/N） and ammonium nitrogen loading rate on simultaneous nitrification and denitrification （SND） was investigated by using a sequencing batch reactor （SBR）. The results show that carbon source is consumed rapidly and SND efficiency is only 0.76% when w（C/N） is 5.6 and ammonium nitrogen loading rate is 0.024 g/（g ·d）. SND can be achieved and SND efficiency is 97.6% when C/N is 10.5 and ammonium nitrogen loading rate is O. 024 g/（g · d）, and the removal efficiency of NH4＋-N and COD is nearly 100%. Furthermore, SND efficiency is 94.5% and the cost of carbon source is improved when w（C/N） is 16.3 and ammonium nitrogen loading rate is O. 024 g/（ g · d）. SND can replace the two-stage separate nitrification and denitrification process and save the operation cost.