Air-permeable membrane, diaphragm, reactor and sewage filtering process

Abstract

The invention provides an air-permeable membrane, a diaphragm, a reactor and a sewage filtering process, belonging to the technical field of sewage treatment. The air-permeable membrane comprises a membrane body, wherein the surface of the membrane body is braided or coated with a biocompatible material for facilitating rapid adhesion and growth of microbes. The diaphragm comprises an upper head, a bottom head, a support bar arranged between the upper head and the bottom head and a plurality of the air-permeable membranes. The reactor comprises a container, a water inlet pipe and a water discharging pipe. The reactor further comprises a shaking device, an air supplying device, a supporting framework and the diaphragm, which are arranged in the container. The process comprises a microbe biomembrane formation procedure, a membrane filtration procedure and a reactor cleaning procedure. With the process, land occupation and energy consumption can be reduced, the operation cycle of the reactor can be prolonged, and cleaning frequency in a MABR process can be decreased; and a manner of combined mechanical motion and out-of-membrane aeration is employed so as to reasonably control the decrement of biomembranes and guarantee normal operation of the MABR process.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a breathable membrane, a diaphragm, a reactor and a sewage filtering process. Background technique [0002] Membrane Aerated Biofilm Reactor (Membrane Aerated Biofilm Reactor–MABR) is a new type of efficient sewage treatment technology that combines membrane aeration technology and biological treatment technology. It is a kind of membrane bioreactor. The basic principle of the technology is: the microbial film is attached to the surface of the gas-permeable membrane, and oxygen is directly obtained from the surface of the gas-permeable membrane; when the sewage flows around the gas-permeable membrane, the pollutants in the water enter the biofilm under the action of concentration difference drive and microbial adsorption, etc. After biological metabolism and proliferation, it is used by microorganisms to assimilate pollutants in the water body into microbial cells fixed ...

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Problems solved by technology

If the flow rate is too slow, not only will the treatment effect of the biofilm reactor be poor, but it will also lead to faster growth of the biofilm, shorten the operation period of the reactor, and increase the frequency of cleaning and thickening the biofilm; Biochemical treatment efficiency, but it will lead to biofilm shedding and loss; at the same time increase the flow rate, under the same residence time, it is necessary to increase the pool capacity, increase the occupied area, and increase the construction cost and operating energy consumption at the same time

[0008] Due to the continuous growth of biofilm, in the later stage of the operation process, the biofilm will be too thick to achieve the ideal removal effect. At this time, the excessively thick biofilm needs to be removed; generally, the method of aeration outside the membrane is often used to remove the biofilm. However, this method is likely to lead to excessive removal of biofilm, and it will take a long time to re-grow and start the biofilm, which will affect the normal operation of the MABR process

[0009] Disadvantages of the existing technology: biofilm formation and reactor start-up time are long in the initial stage of operation; water quality is unstable during operation; sewage hydrodynamic conditions affect operation effect and cost; Thick biofilm, and if the biofilm is removed more, it will affect the normal operation of the biofilm reactor

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