The article investigates using pure oxygen to treat sewage, which is becoming more important as China's economy grows. The study looks at how this technique can be applied at a sewage treatment plant in Jimo. It discusses the theory behind pure oxygen aeration, how to choose the technology, and the economic benefits. The research shows that using pure oxygen can help meet new national standards for removing nitrogen and phosphorus from wastewater, making it a promising option for sewage treatment plants.