A built-in screen type aerobic granular sludge reactor and its sewage treatment method

Abstract

The invention relates to a built-in screen type aerobic granular sludge reactor and a sewage treatment method thereof and belongs to the technical field of sewage treatment. The built-in screen type aerobic granular sludge reactor comprises a reactor body, wherein an aeration device is arranged at the bottom portion of the chamber of the reactor body, the aeration device is connected with an air blower through an air inlet pipe and the air blower is connected with a controller; an annular funnel-shaped filter screen is cooperatively arranged in the chamber at four-fifth to three-fourth height of the reactor, the meshes of the filter screen are 2 to 4mm, the diameter of the upper rim of the filter screen is four-fifth to one of the inner diameter of the reactor body, the diameter of the lower rim of the filter screen is one-fifth to two-fifth of the inner diameter of the reactor body, and an included angle between the inclined surface of the side of the annular funnel-shaped filter screen and the horizontal plane is 45 to 60 degrees. The built-in screen type aerobic granular sludge reactor and the sewage treatment method thereof have the advantages that the internal hydraulic condition of the reactor is regulated and controlled by arranging the annular funnel-shaped filter screen, the particle size distribution of aerobic granular sludge is optimized, and the stable operation of the reactor and the high-efficiency pollutant removing capacity are realized under the condition of low aeration strength.

Description

Technical field [0001] The invention belongs to the technical field of sewage treatment, and specifically relates to a built-in screen type aerobic granular sludge reactor and a sewage treatment method thereof. Background technique [0002] Compared with activated sludge, aerobic granular sludge has a dense structure, anoxic-aerobic colony distribution, high biomass and strong alienation characteristics, which make it have fast mud-water separation, simultaneous biological nitrogen and phosphorus removal, Obvious technical advantages such as high-efficiency degradation of pollutants and residual sludge reduction, and good development and application prospects have attracted wide attention from researchers. However, aerobic granular sludge is prone to instability in long-term operation, which is manifested by the blackening of the inside of the particles, the structure disintegration and fragmentation, the drastic reduction of sedimentation, the large loss of sludge and the collap...

AI Technical Summary

Problems solved by technology

However, increasing the hydraulic shear in the reactor increases the operating energy consumption, and at the same time leads to a smaller average particle size and poorer removal of total nitrogen.

At present, effective control strategies for particle size are still lacking.

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