Backwashing method applicable to control of pollution of internal compression type membrane

Abstract

The invention relates to a backwashing method applicable to control of pollution of an internal compression type membrane and belongs to the field of water treatment. The backwashing method is applicable to ultra-filtration systems, microfiltration systems and the like. The backwashing method comprises the steps of directionally washing in the membrane, adding chlorine and backwashing and the like. The backwashing method applicable to control of pollution of the internal compression type membrane adopts a method of adding chlorine to carry out backwashing on account of the characteristics that pollutants in membrane filaments are strong in adhesion to the surface of the membrane and have small possibility of being removed by using a normal backwashing method; the back washing method comprises the following steps: oxidizing and modifying the pollutants adhered to the inner surfaces of the membrane filaments by adopting the oxidization performance of the chlorine, reducing the adhesion of the pollutants to the membrane, loosening and even peeling off a pollution layer of the membrane, carrying out backwashing and directional washing to wash the pollutants out of the internal compression membrane system, thus controlling the pollution of the ultra-filtration systems. In addition, by adopting the bactericidal performance of the chlorine, the membrane pollution caused due to bacterial growth can be effectively controlled. Since the method is capable of effectively controlling the membrane pollution, the chemical washing period of the internal compression type membrane can be prolonged, thus the service life of the membrane can be greatly prolonged.

Description

technical field [0001] The invention relates to a backwashing method suitable for controlling internal pressure type membrane pollution, belongs to the field of water treatment, and can be used in ultrafiltration, microfiltration and other systems. Background technique [0002] Membrane technology is a brand-new practical technology, which has the characteristics of high efficiency, energy saving, no pollution, convenient operation, reduced process size, reduced engineering cost and wide application. Nowadays, membrane technology has been widely used in the field of water treatment. It is recognized as one of the most promising high-tech in the contemporary era. Membranes (including microfiltration membranes and ultrafiltration membranes, etc.) will suffer from membrane fouling after a period of operation, resulting in an increase in transmembrane pressure difference and a decrease in membrane flux. Therefore, membrane fouling control is a crucial issue in the promotion and...

AI Technical Summary

Problems solved by technology

The water flow direction of the internal pressure membrane is from the inside of the membrane filament to the outside of the membrane filament, and the pollutants are gathered in the narrow space inside the membrane filament, so it is difficult to eliminate it through the generally used flushing and recoil methods; The internal space is narrow and the capillary effect is strong, and the aeration measures used in the external pressure membrane cleaning cannot be used to enhance the backwashing effect, so the common backwashing method has a poor control effect on the internal pressure membrane fouling

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