Highly effective dephosphorizing denitrification combined type sewage treatment equipment

Abstract

The high-efficiency phosphorus and nitrogen removal combined sewage treatment device belongs to the technical field of water treatment. It is composed of a rectangular pool body and an oval pool body. The oval pool body is located in the rectangular pool body. The area formed by the external wall is set as an aerobic pool, and the secondary settling pool, anaerobic pool or anaerobic pool and anoxic pool are set in an oval pool body. The wall is connected, and a circular secondary settling tank is arranged at one end of the oval pool. The circular secondary settling tank and the oval pool share a semicircular wall. The oval pool outside the secondary settling tank is designed to be anaerobic. pool or anaerobic pool and anoxic pool, this device has the advantages of high efficiency dephosphorization and nitrogen removal and short sewage residence time. With different process operations, the internal space is maximized, and it can be suitable for different influent nitrogen and phosphorus concentration conditions and removal rate requirements, and has a wide range of applicability.

Description

technical field [0001] The invention relates to a high-efficiency dephosphorization and denitrification combined sewage treatment device, which belongs to the technical field of water treatment, in particular to a sewage regulating pool, a hydrolysis pool, an anaerobic pool, anoxic pool, an aerobic pool, and a secondary sedimentation pool. High efficiency dephosphorization and nitrogen removal A 2 / O combined process. Background technique [0002] Typical A 2 The / O process consists of anaerobic, anoxic and aerobic three-part rectangular pools, referred to as A 2 / O, when changing the order of anaerobic and anoxic, it becomes inverted A 2 / O process, the secondary settling tank is usually circular and set up separately. There is also a ditch-shaped oxidation ditch that arranges the secondary sedimentation tank in the center, A 2 / O forms a concentric garden outside the secondary settling tank, as disclosed in Chinese patent CN03223656.5 "A 2 / O Sewage treatment device ...

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Problems solved by technology

There is also a ditch-shaped oxidation ditch that arranges the secondary sedimentation tank in the center, A 2 / O forms a concentric garden outside the secondary settling tank, as disclosed in Chinese patent CN03223656.5 "A 2 / O Sewage treatment device of oxidation ditch process", which is composed of secondary sedimentation tank, anaerobic ditch, anoxic ditch and aerobic ditch from inside to outside. The sedimentation tank is in the oxidation ditch. Although this design is economical for a single pool The open space between the pools is eliminated, and the connecting pipe between the pools is also omitted by sharing the wall. The entire oxidation ditch is combined into a huge circle. The disadvantages are: no internal backflow, and applications with high requirements for total nitrogen removal Occasionally, an additional nitrifying liquid reflux system is required; limited by the size of the secondary sedimentation tank, the treatment capacity of a single tank is small, and it is only suitable for small-scale sewage plants; although a single large round tank occupies a small area, when two or more groups of applications are installed, many Two huge circular (or elliptical) pools form more space between the circular pools, resulting in a greater waste of land resources; there is also the above-mentioned combination in which the main process is the Orbal oxidation ditch, but due to There is no anaerobic section in the Orbal oxidation ditch, so the phosphorus removal effect is affected, and the design residence time of the Orbal oxidation ditch process is at least 16 hours, which is an efficient phosphorus and nitrogen removal A 2 The / O process is twice as long as the minimum residence time of 8 hours, and the land occupation cost is relatively large; therefore, the aforementioned two combined processes have not been widely applied and promoted; in addition, due to the high COD and water volume changes in the occasions containing more industrial wastewater Larger, when it is necessary to set up hydrolytic acidification and adjustment tanks, the combination of circular or oval pools and rectangular pools has more obvious disadvantages to land use;

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