Hollow fiber membrane filtration device and method for washing hollow fiber membrane module

摘要

In order to prevent a pressure increase during back-pressure washing of a hollow fiber membrane while suppressing a filtration resistance increase in the membrane by a simple method in a membrane filtration method by means of the hollow fiber membrane, provided is a hollow fiber membrane filtration device provided with a hollow fiber membrane module (4) which has a plurality of side surface nozzles provided with a water supply/drainage function on the side surface, and has an upper end surface nozzle provided with the water supply/drainage function on the upper end surface, and in which a hollow fiber membrane bundle consisting of a plurality of hollow fiber membranes is inserted into a cylindrical case having a lower end surface nozzle provided with the water supply/drainage function on the lower end surface, and in which the end section at least on one side of the hollow fiber membrane bundle is adhered and affixed to the cylindrical case by resin at a higher position than any of the plurality of side surface nozzles, wherein at least two of the plurality of side surface nozzles are communicated with each other through piping.