Method for treating sewage generated during process of cleaning SBR-MBR (sequencing batch reactor-membrane bioreactor) by using integrated machine

Abstract

The invention discloses a method for treating sewage generated during the process of cleaning an SBR-MBR (sequencing batch reactor-membrane bioreactor) by using an integrated machine, relating to online cleaning of the SBR-MBR, applied to automatic cleaning for the SBR-MBR by an integrated machine in the field of municipal sewage treatment, and particularly applied to small-scale sewage treatment. The method consists of a process unit of impurity separation pretreatment, an SBR-MBR main process unit, a flat sheet membrane sludge thickening process post-treatment unit, an automatic control unit and a system for scraping pollutants from surfaces of a bio-mesh and a membrane. As to a bio-mesh assembly in the process unit of impurity separation pretreatment, a flexible membrane assembly in the SBR-MBR main process unit and a flexible membrane assembly in the flat sheet membrane sludge thickening process post-treatment unit, the requirement for control of bio-mesh pollution and membrane pollution and the requirement for sludge stirring can be met at the same time by virtue of different types of bio-mesh and membrane surface pollution control parts and part transmission systems. The whole set of process of the method disclosed by the invention is high in integration degree, good in denitrification effect of effluent and stable in effluent flux and moreover sludge generated by the process can be effectively treated.

Description

technical field [0001] A sewage treatment method using integrated mechanical cleaning of SBR-MBR, involving sequencing batch activated sludge process, membrane bioreactor and its online cleaning, integrated mechanical automatic cleaning sequencing batch membrane bioreactor applied in the field of urban sewage treatment Reactor, especially suitable for small-scale sewage treatment. Background technique [0002] At present, the membrane-bioreactor (hereinafter referred to as MBR) replaces the traditional secondary sedimentation tank with membrane separation, and is a water treatment technology that combines membrane separation technology with activated sludge method. MBR has the advantages of good treatment effect, high sludge concentration, high treatment load, less residual sludge, and small footprint. It has broad prospects for application in the field of sewage treatment and reclaimed water reuse. However, membrane-bioreactors still have the following disadvantages: ...

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Problems solved by technology

[0003] (1) MBR generally operates in an aerobic environment and cannot effectively remove nitrogen. To meet the demand for denitrification of sewage, it is necessary to install an anoxic pool at the front end of the membrane bioreactor, resulting in a larger process area. Increased difficulty in management and maintenance during operation

[0004] (2) In the operation of MBR, it will inevitably cause membrane fouling, resulting in a decrease in membrane flux, or even failure to continue to use, and relying on the replacement of membrane modules to restore the operation of the reactor will inevitably increase the cost of the reactor and cause The interruption of the operation cycle directly affects the efficiency and service life of the membrane module, hindering its practical application

For small-scale sewage treatment plants, it not only leads to high investment, but also causes complex management due to the large number of equipment, and at the same time, high energy consumption

[0006] (4) MBR has high requirements for sewage pretreatment. Too many fine particles in the influent will accumulate in the reactor and on the membrane surface, which will affect the long-term stable operation of MBR. The existing design and engineering still lack pretreatment for MBR. processing equipment

[0007] (5) Existing small-scale sewage treatment equipment or projects lack sludge treatment systems, and there are problems with sludge outlets

[0010] (2) It is easy to generate scum, and the treated water still contains suspended substances

[0011] (3) Requirements for post-processing equipment are large

In this sewage treatment method, the raw water is pressurized by the inlet pump and injected into the reaction tank through the water distribution pipe when there is a lack of oxygen, so that the sludge and raw water are contacted and mixed, the operating system is complicated, the energy consumption is extremely high, and there are no effective membrane pollution control measures , will lead to aggravated membrane fouling, decreased effluent flux, unstable sewage treatment system, and high operation and maintenance costs

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