The treated sewage enters the sewage treatment equipment or structures, and the water passes through the sewage treatment equipment or structures to meet the treatment requirements or discharge standards. Official website, Guang 'an Municipal People's Government, shows that sewage flows in, clear water is discharged, and after treatment, it flows into the main pipeline. The main pipeline is connected to the sewage treatment plant, and after advanced treatment by the sewage treatment plant, the drainage reaches the highest standard of the urban sewage treatment plant.