Sewage treatment efficient energy-saving pressure MBR (membrane bioreactor)

Abstract

The invention provides an MBR (membrane bioreactor) system with low energy consumption and high treatment capability. The MBR system comprises a sealed MBR, a water inlet pipeline, a water outlet pipeline, a gas inlet pipeline and an exhaust pipeline, wherein the MBR comprises a biochemical assembly and a membrane assembly; air or oxygen is introduced into the MBR through the gas inlet pipeline for aeration, and certain pressure is formed in the MBR. The MBR system has the advantages that 1, a pressure aeration technology is used, so that the dissolved oxygen concentration of an aerobic pool in the biochemical treatment assembly is greatly improved; 2, high aeration intensity can be realized through small aeration quantity, so that the aeration pool volume can be greatly reduced; further, the volume and the cost of the MBR system are reduced; 3, the gas pressure driving is used for replacing the existing self sucking pump driving mode for reducing the membrane driving energy consumption; 4, the gas circulation of an aeration system is realized in various modes, so that the gas overbottom pressure is fully utilized, and the energy consumption of the system is further reduced.

Description

technical field [0001] The invention belongs to the field of sewage treatment, more specifically, to the field of high-efficiency and energy-saving pressure membrane bioreactors in sewage treatment. Background technique [0002] Membrane bioreactor (MBR) is a new sewage treatment technology that combines membrane technology and biochemical reaction technology. MBR technology has not developed rapidly until recent years, and is currently one of the most promising sewage treatment technologies. . MBR uses a membrane to filter the muddy sewage in the biochemical reaction tank to realize the separation of muddy water. On the one hand, the microorganisms in the reaction tank are retained, and the sludge concentration in the tank is increased, so that the biochemical reaction of degrading sewage can be carried out more rapidly and thoroughly. On the other hand, due to the high filtration accuracy of the membrane, the effluent is clearer and more transparent. [0003] The superi...

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Problems solved by technology

[0003] Superior processing performance makes MBR have broad application prospects, but MBR technology still has some difficult technical problems, such as its energy consumption is much higher than traditional technology

First of all, the concentration of suspended solids in the MBR tank is higher than that of the ordinary activated sludge method. To maintain a sufficient oxygen transfer rate, the aeration intensity must be increased, and the energy consumption of the aeration system is relatively large; secondly, a certain membrane must be maintained during the sludge-water separation process. driving pressure

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