Double-aeration aerobic granular sludge-membrane bioreactor coupling device and application thereof

Abstract

The invention discloses a double-aeration aerobic granular sludge-membrane bioreactor coupling device and application thereof, and belongs to the technical field of sewage treatment. The device of theinvention comprises a water inlet pipe, an outer cylinder, an inner cylinder, a first aeration assembly, an upper shell, a settling tank, a membrane pool body, a second aeration assembly and a wateroutlet pipe; a lower outer reaction zone is located between the outer cylinder and the inner cylinder, and an inner cavity of the inner cylinder is provided with a lower inner reaction zone; the firstaeration assembly is used for aeration in the lower inner reaction zone; an upper ascend flow zone is located between the upper shell and the settling tank, and an upper descend flow zone is locatedbetween the settling tank and a membrane biological reaction tank; the bottom part of the settling tank is connected with the outer cylinder through a return pipe; the membrane pool body consists of porous plates; a membrane assembly is arranged in the membrane pool body; the second aeration assembly is used for performing aeration scouring on the surface of the membrane assembly; and two ends ofthe water outlet pipe respectively communicate with an inner cavity of the membrane assembly and a clear water tank. The coupling device can fully guarantee the different aeration intensity and aeration rate requirements of the aerobic granular sludge and membrane bioreactor (MBR) membrane assembly.

Description

technical field [0001] The invention relates to a double aerated aerobic granular sludge-membrane bioreactor coupling device and an application thereof, belonging to the technical field of sewage treatment. Background technique [0002] With the development of urbanization and the increase of population density, a large amount of domestic sewage is discharged into natural water bodies, causing the deterioration of water environment quality, especially the excessive discharge of nitrogen and phosphorus in domestic sewage, which leads to severe hypoxia in water bodies and damages the aquatic ecological environment. An important cause of black and odorous water bodies in cities. In recent years, sewage treatment technology has been continuously developed. Based on the traditional activated sludge process, A2 / O, SBR, oxidation ditch and its improved processes have been widely used. In order to adapt to the ever-increasing sewage treatment standards, based on the development of ...

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Problems solved by technology

[0005] However, in the application process of the aerobic granular sludge process, there are still problems such as long cultivation period and difficulty in ensuring long-term operation stability. Since the MBR process requires a large amount of aeration to flush the membrane filaments, aerobic granular sludge can It is easy to break under the gas intensity, and there is also the problem of inconsistent aeration requirements in the combined process of aerobic granular sludge and MBR process. Therefore, it is of great significance to develop a new type of aerobic granular sludge-membrane bioreactor coupling device.

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