根据桂林市排水公司第四污水净化厂的实际运行情况 ,分析了影响A2 /O工艺除磷效果的三个因素 :溶解氧、硝酸盐氮、污泥龄。并采取了提高除磷效果的一些措施 ,实践表明这些措施对提高除磷效果具有明显的作用 According to the actual operation of the fourth wastewater purification plant in Guilin Drainage Company, three factors that affect the phosphorus removal efficiency of A2 / O process are analyzed: dissolved oxygen, nitrate nitrogen, and sludge age. And taken some measures to improve the effect of phosphorus removal, practice shows that these measures have an obvious effect on improving phosphorus removal