1, centralized discharge. With the acceleration of urbanization, urban sewage mainly comes from human activities (such as residential, agricultural, industrial, medical, activity centers, public **** places, etc.). These discharge sources are mainly concentrated in the city's main outfalls into the sewage treatment plant.
2, highly concentrated. The concentration of wastewater in urban sewage is high, and the volume, composition and quality of wastewater from different discharge sources vary greatly.