The average removal rate of COD, NH_4~+-N, TN, PO_4~(3-) was respectively 90.7%, 79.7%, 70.2% , 87%, when HRT was 12.8h, SRT was 25d, reflux ratio of nitrification was 3. With this condition, the effect of denitrifying dephosphatation was well.

• 以HRT为12.；8h；SRT为25d；硝化液回流比为3:1为运行工况。 污泥负荷率约为0