The results showed that outflow can reach second level criterion of state, if 1/3 of existing aeration pond was converted to anoxic zone with DO concentration of 0.1mg/L,and the inner cycle mixed liquid rate of 100%.

• 缺氧池与好氧池的体积比为1:3；缺氧池内溶解氧浓度为0.；1mg/L；回流比R为100%25。 其出水可满足国家二级排放标准