Membrane filtration method and membrane filtration device

Abstract

A membrane filtration method and a membrane filtration device are provided. The membrane filtration method and the membrane filtration device comprise: a pre-treatment membrane module that filters raw water with a filtration membrane so as to obtain pre-treated water; a reverse osmosis membrane module that filters the pre-treated water obtained from the pre-treatment membrane module with a reverse osmosis membrane so as to obtain permeate and retentate; a communicating tube channel that directly joins a pre-treated water outlet of the pre-treatment membrane module and a pre-treated water inlet of the reverse osmosis membrane module; and a branch tube channel that branches from the communicating tube channel and diverts a portion of the pre-treated water flowing in the communicating tube channel from the communicating tube channel. The filtration membrane of the pre-treatment membrane module is backwashed by using the pre-treated water that has been diverted by the branch tube channel.

Description

technical field [0001] The present invention relates to a membrane filtration method and membrane filtration device for obtaining permeated water and concentrated water by further treating pretreated water obtained by filtering raw water with a pretreatment membrane module equipped with a filtration membrane with a reverse osmosis membrane module equipped with a reverse osmosis membrane. [0002] Specifically, the present invention relates to a membrane filtration method and a membrane filtration device, characterized in that a water treatment system comprising a pretreatment membrane module and a reverse osmosis membrane module is used, and these pretreatment membrane modules and the reverse osmosis membrane module are in a deliberate relationship Combined with the pipeline, the pretreatment membrane module that needs to be backwashed by the filter membrane is backwashed by the pretreatment water that circulates in the pipeline, wherein the pretreatment membrane module is equi...

AI Technical Summary

Problems solved by technology

However, this method has the following problems: microorganisms are easy to grow in the pretreatment water stored in the reverse osmosis membrane raw water tank, and when the pretreatment water containing the bred microorganisms is supplied to the reverse osmosis membrane, the reverse osmosis membrane will be polluted by microorganisms

Therefore, the above-mentioned problem of contamination of the reverse osmosis membrane by microorganisms remains

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