Immersed type on-line cleaning method and device for slab ceramic membrane

Abstract

The invention relates to an immersed type on-line cleaning method and device for a slab ceramic membrane. The invention aims to provide the method which can be used for cleaning the slab ceramic membrane in an in-situ or online manner without separating the ceramic membrane and a reactor, and the method has the characteristics of high membrane flux recovery speed, low energy consumption, high cleaning efficiency, low operation cost and automatic control. The provided device has the characteristics of simple structure and convenience in use. According to the technical scheme, the immersed type on-line cleaning process for the slab ceramic membrane comprises the following steps in sequence: (1) turning on on-line cleaning; (2) back-flushing a liquid phase; (3) back-flushing gas and liquid in a combined manner; and (4) finishing the on-line cleaning. The immersed type online cleaning device for the slab ceramic membrane comprises an aeration pipeline and a control system, wherein the on-line cleaning device further comprises a liquid-phase back-flushing system; the liquid-phase back-flushing system is assorted with a back-flushing pump and is communicated with the aeration pipeline through a pipeline; a cleaning agent preparation device is communicated with the liquid-phase back-flushing system through a pipeline.

Description

technical field [0001] The invention relates to the field of water treatment in environmental protection engineering, in particular to an online cleaning method and device for a submerged flat ceramic membrane. Background technique [0002] Ceramic membrane, also known as inorganic ceramic membrane or CT membrane, is a kind of solid membrane with high separation efficiency, stable effect, good chemical stability, acid and alkali resistance, organic solvent resistance, bacteria resistance, high temperature resistance, pollution resistance and mechanical strength. High efficiency, good membrane regeneration performance, simple separation process, low energy consumption, easy operation and maintenance, long membrane service life and many other advantages. [0003] However, there are obstacles to the large-scale promotion and application of ceramic membranes at present, mainly because the membrane flux decreases sharply due to the clogging of membrane pores during use, which inc...

AI Technical Summary

Problems solved by technology

[0013] Based on the existing patents, literature research and market products, it can be found that the existing cleaning methods are mainly for tubular porous ceramic membranes, and there are few reports on the cleaning methods for submerged flat ceramic membranes; the cleaning methods are mainly offline cleaning, The ceramic membrane needs to be separated from the reactor, and a separate off-line cleaning pool needs to be set up, which is not only time-consuming and labor-intensive, but also easily causes damage to the membrane; in addition, the backwashing method adopts simple liquid reverse flushing or gas reverse flushing, resulting in poor cleaning effect Good, long cleaning time

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