以牡丹江污水处理工程为例，针对 A2／ O 生物处理工艺同步脱氮除磷效果差这一现象，提出一种分段进水的 A2／ O 改良工艺，在厌氧区前设置预缺氧段，10%的原水进入该处理区，剩下的原水按不同的比例，分别进入厌氧和缺氧生物处理区，试验结果表明，3：2进水比例的脱氮除磷效果最好。%Taking Mudan River sewage treatment engineering as an example,in light of poor synchronous denitrification and phosphorus removal effect of A2 / O biological processing technology,the paper puts forward step-feeding A2 / O technology,sets hypoxic preconditioning section in an-aerobic zone,10% of raw water flows into the set region,and the rest raw water respectively flow into anaerobic and hypoxic biology processing zones according to different ratios. The experimental results show that:the denitrification and phosphorus removal effect is the best according to the water flowing ratio of 3: 2.
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