System and method for treating urban sewage

Abstract

The invention belongs to the technical field of environmental protection, and in particular relates to a system and a method for treating urban sewage. The invention provides the system and the methodfor treating the urban sewage, which are simple in operation, good in treatment effect, simple in process and strong in adaptation to water quality and water amount and of which the effluent meets the discharge standard. The technical scheme is as follows: by adopting a treatment process of an anaerobic tank and an oxidation ditch, big and small suspended matters are substantially removed after the sewage passes through a middle bar screen and a fine bar screen; the effluent enters an aeration desilting basin so that inorganic particles with a big grain size, such as sands, gravels and coal slag, are precipitated; the effluent enters the anaerobic tank and the oxidation ditch, wherein in the oxidation ditch, the mixed liquid of the wastewater and activated sludge continuously and circularly flows under the action of an externally added driving force, organic substances are degraded under the functions of microorganisms, and the nitrogen and phosphor are well removed; the effluent enters a secondary settling tank; after the sludge and water in the effluent are separated, the sterilized and filtered effluent can be discharged after reaching the standard; and the left sludge is condensed, dehydrated and carried away.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an urban sewage treatment system and method. Background technique [0002] With the acceleration of industrialization, environmental problems have become increasingly prominent, especially the deterioration of urban water environment, which has exacerbated the shortage of water resources. Insufficient water sources in many areas and cities have affected the physical and mental health of the people, and have become the key to sustainable urban development. serious constraints. Compared with foreign developed countries, my country's urban sewage treatment started relatively late. In the past 200 years, urban sewage treatment has developed from the original natural treatment and simple primary treatment to the use of various advanced technologies, advanced treatment of sewage, and reuse. Urban sewage treatment methods include AB method, SBR method, A ...

AI Technical Summary

Problems solved by technology

The SBR method was developed as early as the beginning of the 20th century. This method integrates water intake, aeration, sedimentation, and water discharge in one pool. It usually consists of three or four pools, which operate in turn and run intermittently one by one. , so it is called sequencing batch activated sludge method, but this method is not suitable for large-scale urban sewage treatment

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