As to NH_4~+-N, main factors were orderly aeration duration, aeration volume and settling duration. Dissolved oxygen(DO) showed more effects on NH_4~+-N removal than COD removal.

• 影响NH_4~+-N 去除率的最主要因素为曝气时间,溶解氧(DO)浓度对NH_4~+-N 硝化反应的影响要比对COD 去除的影响大。