External-pressure-type hollow fiber membrane module

Abstract

The present invention provides a hollow fiber membrane module in which fouling is less likely to occur on hollow fiber membranes during a filtering operation and which has excellent washability for the hollow fiber membranes. In this external-pressure-type hollow fiber membrane module, a first end side or a second end side of each of multiple hollow fiber membrane bundles 60 are fixed, by an adhesive, together with an inner wall surface of a tubular housing 10 or with inner wall surfaces of caps. The section, on the first end side, fixed by the adhesive has multiple raw-water-introduction holes 65 formed by penetration in the thickness direction. The multiple raw-water-introduction holes 65 include: first group raw-water-introduction holes 66 which are formed at positions including the centers of the respective multiple hollow fiber membrane bundles 60; and second group raw-water-introduction holes 67 which are formed between the respective adjacent multiple hollow fiber membrane bundles 60 and between the multiple hollow fiber membrane bundles 60 and the inner wall surface of the tubular housing 10.

Description

technical field [0001] The present invention relates to an external pressure type hollow fiber membrane module that can be used for water treatment applications in various fields. Background technique [0002] When continuous filtration operation is performed using a hollow fiber membrane module containing a plurality of hollow fiber membranes, fouling may occur due to membrane clogging or formation of an adhesion layer on the membrane surface, which may degrade filtration performance. When such fouling occurs, the filter performance is restored by performing air washing or back pressure washing to wash the membrane. [0003] FIG. 6 of Patent Document 1 (Japanese Patent No. 4498373 ) shows a rack type filter unit. One end of the plurality of hollow fiber membranes 3a is integrated by an adhesive fixing layer 14 having through holes 14a. During the filtration operation, raw water is supplied to the feed water inlet 2c, enters the lower ring 13, and is guided to the outer pe...

AI Technical Summary

Problems solved by technology

It records the following content: In this way, since the raw water enters from both the outer peripheral surface and the inner peripheral surface of the hollow fiber membrane bundle, the contact area between the hollow fiber membrane and the raw water becomes larger, which can reduce the accumulation of the filtered matter. Reduction in filtration efficiency of hollow fiber membranes caused by coating (paragraph 0019)

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