Device and method for delaying MBR (membrane bioreactor) membrane contamination and blocking

Abstract

The invention discloses a device for delaying MBR (membrane bioreactor) membrane contamination and blocking. The device comprises an MBR membrane assembly, an MBR membrane frame body, a moving frame,a driving device and two parallel support rails, wherein the moving frame and the two parallel support rails are glidingly matched; the MBR membrane assembly is placed in the MBR membrane frame body;the MBR membrane frame body is fixedly connected with the lower side of the moving frame; the driving device is fixedly arranged on a connecting beam arranged between the two support rails and can drive the moving frame to do reciprocating movement along the support rails. The invention also provides a method for delaying the MBR membrane contamination and blocking. The MBR membrane assembly vibrates in an MBR by the driving device; vibration water flow is generated; the MBR membrane assembly is continuously flushed; meanwhile, membrane wires mutually collide and rub, so that the contaminationand blocking of the MBR membrane is delayed. The device and method for delaying the MBR membrane ontamination and blocking have the advantages that the cost is low; the energy consumption is low; theeffect of delaying the membrane contamination and blocking is good; the MBR membrane contamination and blocking can be delayed on the premise of ensuring the low-dissolved oxygen concentration environment in the MBR.

Description

technical field [0001] The invention relates to the technical field of membrane bioreactors, in particular to a device and method for delaying MBR membrane fouling. Background technique [0002] With the acceleration of urbanization in our country, higher and higher requirements are put forward for sewage treatment: high treatment efficiency, small footprint, convenient installation and maintenance, high degree of integration and automation, so membrane bioreactor (MBR) ) technology has been deeply developed and widely used. MBR is a new type of sewage treatment technology that combines biological treatment technology and membrane separation technology. It replaces the secondary sedimentation tank with a small-volume membrane separation device, which can maintain a high concentration of activated sludge in the bioreactor and reduce sewage treatment facilities. footprint and reduce sludge volume by keeping sludge load low. [0003] However, when the MBR membrane is in opera...

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Problems solved by technology

[0003] However, when the MBR membrane is in operation, particles, colloids, solute macromolecules or other solid impurities in the water will have physical and chemical interactions with the membrane, and will continue to adhere and accumulate on the membrane surface and in the membrane pores, resulting in blockage of the membrane pores and membrane fouling. , affect the normal effluent, so when the MBR membrane is running, measures to delay membrane fouling must be taken at the same time to prolong the cleaning cycle and service life of the membrane

At present, during the operation of MBR membranes, aeration is usually used to flush the membranes to delay membrane fouling. The concentration of dissolved oxygen in the MBR is too high to realize the anoxic or anaerobic environment of some sewage treatment processes. At the same time, the aeration also makes the sludge in the MBR turn up, which is not conducive to the separation of mud and water.

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