With the development of society, people have more and more strict requirements for the treatment of urban sewage. In addition to the basic requirements of BOD and SS removal in sewage, nitrogen and phosphorus removal is also generally required to protect the water environment. In Xinqiao sewage treatment plant, A2O process, which is more economical and reasonable among many denitrification and phosphorus removal processes, is used to treat the sewage entering the sewage treatment plant. The daily treatment capacity of domestic sewage in Xinqiao Town, Mianyang City, where the sewage treatment plant is located, is 1500m3. The BOD, SS, nitrogen and phosphorus elements in the water are effectively removed, and the quality of the effluent will meet the class I B standard of GB18918-2002. This paper studies the treatment process and structure of the sewage treatment plant.<br>
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