A kind of aao sewage treatment system that meets the standard of four types of surface water and its process

Abstract

The invention discloses an AAO sewage treatment system of four types of standard surface water and its process, including an AAO biochemical pool, a rectangular secondary settling pool with weekly inlet and weekly outlet, and a biological contact oxidation pool; sewage enters the AAO biochemical pool, and utilizes anaerobic and The alternating cycle of three different parts, aerobic and aerobic, realizes the biological phosphorus and nitrogen removal treatment of the sewage discharged from the sewage pipe; the first anoxic pool and the anaerobic part form an independent internal backflow, and the aerobic part and the second anoxic pool Another independent internal return flow is formed, and the internal design of the anaerobic part, the first anoxic tank, the second anoxic tank and the aerobic part is a surround-back flow type; the sewage at the outlet of the aerobic part enters the circle into the circle and out of the rectangle Solid-liquid separation is realized in the secondary settling tank; part of the separated sludge is returned to the first anoxic tank or anaerobic tank of the aforementioned AAO biochemical tank, and the rest is discharged as excess sludge; the sewage separated from the rectangular secondary settling tank is introduced into In the biological contact oxidation tank, the biofilm method is used to strengthen the oxidation and decomposition of ammonia nitrogen to purify the sewage.

Description

technical field [0001] The invention relates to the technology in the field of sewage treatment, in particular to an AAO sewage treatment system and a process thereof that meet the four types of standard surface water. Background technique [0002] According to the environmental functions and protection objectives of surface waters, my country's surface water is divided into five categories according to the level of function: I, II, III, IV, and V; now many urban sewage discharge standards are set at the discharge standard of surface water category IV, that is, the main It is suitable for general industrial water areas and recreational water areas where the human body is not in direct contact with. [0003] Urban sewage is mainly urban domestic sewage and some industrial wastewater. At present, physical, biological, and chemical methods are mainly used to treat industrial wastewater and domestic sewage to separate solid pollutants in water and reduce organic pollutants and eu...

AI Technical Summary

Problems solved by technology

Although some sewage treatment systems can achieve the effluent quality of the aforementioned surface water category IV discharge standards, they have the defects of large fluctuations in water quality and poor process stability, especially the high requirements for TP and ammonia nitrogen. More energy is consumed in the process of sewage treatment, and the cost of sewage treatment is high, which is not conducive to popularization and application

Images