Membrane cleaning device applicable to submerged membrane bioreactor

Abstract

The invention provides a membrane cleaning device applicable to a submerged membrane bioreactor. A micrometer and nanometer air bubble generator is used for replacing the traditional perforated aerator pipe, high-pressure water flows rich in micrometer-scale and nanometer-scale air bubbles are generated in the membrane bioreactor, while necessary oxygen for the microbial reaction is supplied, a good flushing effect is realized on a membrane assembly. The membrane cleaning device comprises the micrometer and nanometer air bubble generator and an oxygen supply system, wherein the micrometer and nanometer air bubble generator comprises a micrometer and nanometer air bubble generator host and aeration heads, an air dissolving device and a booster pump connected with the air dissolving device are arranged in the host, an air inlet of the air dissolving device is connected with the oxygen supply system, a water inlet of the air dissolving device is communicated with the membrane bioreactor, a water outlet of the air dissolving device is connected onto a plurality of aeration heads arranged in the membrane bioreactor through connecting pipelines, the aeration heads are uniformly arranged at the lower end of the membrane assembly arranged in the membrane bioreactor, and the directions of high-pressure water flows flowing out from the water outlets of all of the aeration heads are parallel to or tangent to the solid-liquid interface of a membrane of the membrane assembly.

Description

technical field [0001] The invention relates to a membrane bioreactor, in particular to a membrane cleaning device suitable for a submerged membrane bioreactor. Background technique [0002] Membrane bioreactor (Membrane Bio-Reactor, MBR), is a new type of wastewater treatment system that combines membrane separation technology and biological treatment technology. Separation has incomparable advantages over traditional wastewater treatment processes and is widely used in the field of wastewater treatment. According to the combination of membrane modules and bioreactors, membrane bioreactors can be divided into two basic types: split type and submerged type. [0003] The split membrane bioreactor separates the membrane module and the bioreactor. The mixed liquid in the bioreactor is pressurized by the circulating pump and then sent to the filter end of the membrane module. Under the action of pressure, the liquid in the mixed liquid permeates the membrane and becomes the ef...

AI Technical Summary

Problems solved by technology

Since the amount of aeration gas required by the membrane module is the amount of physical flushing of the membrane module, it is related to the number of membrane modules and the amount of water to be treated, while the amount of aeration required by the membrane bioreactor is related to the concentration of pollutants in the influent, so Through the perforated aeration tube, the aeration volume required by the membrane module and the aeration volume required by the membrane bioreactor usually cannot completely match, resulting in excessive aeration volume and high energy consumption. The flushing effect of the mixed fluid is also relatively limited

Images