Reactor and method with sludge discharge device for enhanced stable operation of aerobic granular sludge

Abstract

The invention discloses a reactor provided with a sludge discharging device for enhancing stable operation of aerobic granular sludge, and a method thereof. The reactor comprises a water inlet unit, a reactor body, an aeration unit, a sludge discharging unit and a water discharging unit, wherein the sludge discharging unit comprises a first solenoid valve, a sludge collecting tank and a first peristaltic pump, and a sludge outlet at the middle part of the reactor main body is connected with the sludge collecting tank through a pipeline provided with the first solenoid valve; a liquid level meter used for detecting the height of a liquid level is arranged in the sludge collecting tank, a first turbidity sensor is arranged near the liquid level in the sludge collecting tank, and a second turbidity sensor is arranged at the bottom of the sludge collecting tank; and a muddy water outlet at the bottom of the sludge collecting tank is divided into two paths by a pipeline, one path is directly outward discharged through a pipeline provided with the second solenoid valve, and the other one path passes through the first peristaltic pump and returns to the reactor from the bottom of the reactor main body. The mud discharging unit can judge whether the muddy water is fully clarified or not in order to realize secondary treatment of residual sludge, effectively control the muddy age and highly-efficiently enrich functional microorganisms.

Description

technical field [0001] The invention relates to a reactor and a method with a sludge discharge device for strengthening the stable operation of aerobic granular sludge, and belongs to the technical field of wastewater biological treatment. Background technique [0002] Aerobic granular sludge is a self-fixed form of microorganisms formed spontaneously under aerobic conditions. It has excellent settling performance, high biological retention, low sludge yield and resistance to organic load impact, which greatly compensates for the traditional Disadvantages of the activated sludge process. In 1997, Morgenroth et al. used short hydraulic retention time and settling drainage time to discharge the floc sludge with poor settling performance in the sequence batch reactor (Sequence Batch Reactor, SBR), and kept the dissolved oxygen concentration in the reactor at 2 mg / L or more, after 40 days of cultivation, a large amount of stable aerobic granular sludge (AGS) was successfully c...

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Problems solved by technology

[0003] However, the aerobic granular sludge currently operating in the SBR reactor cannot be effectively retained due to the functional microorganisms, and a large number of functional bacteria are washed out in the late stage of the reactor operation, which leads to microbial metabolic disorders in the system, inhibits nitrification and denitrification, and affects the granular sludge. Structural stability, further causing irreversible instability of the reactor, restricting its industrial application

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