Internal-pressure type ultrafiltration membrane flusher and flushing method

Abstract

The invention discloses an internal-pressure type ultrafiltration membrane flushing method and a flusher. The flusher provided by the invention comprises a flushing water pipe and a flushing water switch, a sewage discharge pipe and a sewage discharge switch, and further comprises an air storage tank and an air supply pipe, as well as an air supply switch arranged on the air supply pipe, wherein the air supply pipe is connected to the water inlet of a filter element. Under the action of pressure, the air in the air storage tank passes through the filter element and gaseous-liquid two phase flows are formed in the filter element; and the acting manner and the acting intensity of the single water phase with the attachments inside the membrane filaments are changed; therefore, flushing of the filter element can be finished well. Compared with the traditional flushing way, the flusher is capable of completing back flushing of the filter element better and more thoroughly; therefore, the water flux of the filter element after flushing is improved, stoppage of the ultrafiltration membrane is retarded, the service lives of the ultrafiltration membrane and the filter element are prolonged, the total water flux of the filter element is improved, and simultaneously, the flushing time is saved and the back flushing water is saved.

Description

technical field [0001] The invention relates to the field of household water purifiers, in particular to an internal pressure ultrafiltration membrane flushing device. In addition, the invention also relates to an internal pressure type ultrafiltration membrane flushing method. Background technique [0002] Hollow fiber ultrafiltration membranes are widely used in the water treatment industry, especially filter elements made of internal pressure hollow fiber ultrafiltration membranes are more commonly used in tap water treatment, seawater desalination pretreatment, sewage treatment and household water purification. However, due to the high cost of the membrane, it is very important to alleviate membrane clogging, remove membrane fouling and prolong the service life of the membrane in the application. [0003] When the filter element starts to pass water, the pollution of the inner surface of the membrane also begins, especially in the case of low flow rate, high solute conc...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it requires a large amount of gas to flush the surface of the membrane during operation, and it does not involve how to operate when backwashing

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