When the dissolved oxygen (DO) was at least 2 mg/L in the sludge activation tank, removals of COD and SS were at the highest level, while a DO of 5 mg/L was required to for effective removal of NH3-N; DO had no effect on phosphate removal.

• 活化池内溶解氧为2mg/L时COD、SS去除效率最高,当溶解氧为5mg/L时,氨氮的去除率最高,溶解氧对磷酸盐的去除没有明显影响。