The urban domestic sewage treatment system in Guilin has been put into use. This project has the integration of anoxic zone, aerobic zone, sedimentation zone, sludge concentration zone and disinfection zone. Each unit has a good processing function, and the perfect combination of the various functional areas can achieve the ideal processing effect. The project has been running well so far. This system can process up to 500 tons per day. The use of Yingherui enamel assembly AO integrated process not only solves the problems of "high investment, large area and long cycle", but also enables the treatment of water energy. Meet the emission standards.