溶解氧对多段式生物接触氧化法的脱氮除磷的影响

以COD/TN为2.7左右的实际生活污水为处理对象，通过调整系统曝气量，研究了DO对多段式生物接触氧化法脱氮除磷系统运行性能的影响。结果表明，设定的5组DO条件下，处理效果与前、后端DO浓度差异有关。当前段DO为3-4mg/L，后段DO为4-5mg/L时，COD、TN的去除率90%、81%，满足GB18918-2002污水排放一级A标准，装置污泥量很少，没有剩余污泥排放，TP去除效果稍差。通过对装置生物多样性和生物膜质量的分析，表明DO浓度的差异性变化，为生物膜上微生物同步硝化反硝化创造了条件。

Effect of DO on Nitrogen and Phosphorus Removal by Multi-stage Biological Contact Oxidation

The actual domestic sewage with COD/TN of 2.7 is treated. By adjusting the aeration of the system, the effect of DO on the performance of multi-stage biological contact oxidation denitrification and dephosphorization system is studied. The results show that under the set 5 sets of DO conditions, the treatment effect is related to the difference of DO concentration between the front and the back. When the current DO is 3-4mg/L and the DO in the latter stage is 4-5mg/L, the removal rate of COD and TN is 90% and 81%, which meets the Grade A standard of GB18918-2002 sewage discharge. There is no excess sludge discharge and the TP removal effect is slightly worse. Through the analysis of the device biodiversity and biofilm quality, the differential changes of DO concentration are indicated, which creates conditions for microbial simultaneous nitrification and denitrification on biofilm.