利用一体化污水处理小试装置考察了溶解氧（DO）及回流比对装置处理效果的影响，试验结果表明，DO和回流比对COD和NH₄⁺-N的去除影响较大，DO为4.0~4.5 mg/L时，COD、NH₄⁺-N的去除率最高分别为92.9%、93.5%；回流比为300%时COD去除率最高达到96.4%。DO和回流比增加对TN、TP的去除率呈现先上升后下降的趋势，在DO为3.5~4.0 mg/L时，TN、TP去除率最高至54.8%、70.6%；回流比为200%时，TN、TP去除率最高分别为68.6%、75.5%，而DO和回流比的进一步增加抑制了反硝化细菌脱氮以及聚磷菌厌氧释磷的过程，从而使得TN、TP去除率下降。

The influences of dissolved oxygen (DO) and reflux ratio on the treatment effect are investigated in a microcosm sewage treatment integrated equipment.The experimental results exhibit that both DO and reflux ratio have great impact on the removal of COD and NH₄⁺-N.The removal efficiencies of COD and NH₄⁺-N can reach up to 92.9% and 93.5% respectively when DO is about 4.0-4.5 mg·L^-1.The removal efficiency of COD can reach up to 96.4% when reflux ratio is 300%.However,the removal efficiencies of TN and TP show a trend of rising first and declining then when DO and reflux ratio increase.The removal efficiencies of TN and TP reach up to 54.8% and 70.6% respectively when DO is about 3.5-4.0 mg·L^-1,and reach up to 68.6% and 75.5% respectively when reflux ratio is 200%.It is analyzed that the further increases of DO and reflux ratio suppress the denitrification process of denitrifying bacteria and anaerobic phosphorus release process of phosphorus accumulating bacteria,which therefore causes the removal rates of TN and TP to decrease.

侯荣荣(1994-),女,硕士研究生,研究方向为高效重金属污染移除材料和控制技术,1663896502@qq.com