METHOD FOR OPERATING SEPARATION MEMBRANE MODULE

摘要

The present invention is a method for operating a separation membrane module provided with: a separation membrane having a first surface and a second surface; a processed-liquid flow path in which a liquid to be processed, which is supplied to the first surface, flows; and a permeated-liquid flow path in which permeated liquid obtained from the second surface flows, wherein the method for operating a separation membrane module includes: a filtration step for supplying a liquid to be processed to the processed-liquid flow path so as to obtain a permeated liquid containing a component that becomes insoluble when exposed to acid; a first water substitution step for replacing liquid in the permeated-liquid flow path with water after the filtration step; a first chemical wash step for passing an acidic chemical liquid from the second surface to the first surface after the first water substitution step and performing reverse pressure washing; and a second water substitution step for replacing liquid in the permeated-liquid flow path with water after the first chemical wash step.