Energy-saving and consumption-reduction stable operation device and method for enhancing aerobic granule sludge

Abstract

The invention discloses an energy-saving and consumption-reduction stable operation device and a method for enhancing aerobic granule sludge. The device comprises a water inlet unit, a reactor main body, an aeration unit, a water outlet unit and a time control unit, wherein the time control unit is a programmable automatic time controller, and comprises a time control switch and a liquid level meter probe; the time control switch controls a cyclic process of reactor operation; and water inflow is controlled by the liquid level meter probe via electrical signal conduction. An operation cycle is divided into water inlet, standing, aeration, settling and water outlet stages; sludge is inoculated; MLSS (mixed liquor suspended solid) is inoculated as 4-6g / L; an inlet water matrix is town sewage; COD (chemical oxygen demand) concentration of inlet water is 300-800mg / L; a height-diameter ratio of 4-8 and a drainage ratio of 30-70% are adopted; the operation cycle is 4-6h; the settling time is 5-15min; and the aeration time is 3-5h. According to the device and the method, the aerobic granule sludge which is large in granule size, high in settling velocity, stable in structure and rich in flora can be formed, and the problems of high aeration energy consumption, easy sludge bulking in an operation process, unstable long-time operation of a system and the like in the prior art are solved.

Description

technical field [0001] The invention relates to an aerobic granular sludge operation process and device for treating urban sewage, and belongs to the technical field of wastewater biological treatment. Background technique [0002] In 1991, Mishima et al. discovered the self-coagulation phenomenon of aerobic activated sludge in a continuous flow AUSB reactor. 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 The shortcomings of the traditional activated sludge method. 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...

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Problems solved by technology

[0003] However, the current aeration intensity of the aerobic granular sludge process is generally 2cm / s-5cm / s. High aeration intensity not only brings about high energy consumption, but also the continuous high aeration shear of granular sludge during the aerobic starvation period It is easy to inhibit denitrification and affect the stability of particle structure under certain conditions, which restricts its industrial application

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