AGENT AND METHOD FOR CLEANING PERMEABLE MEMBRANES

摘要

The invention provides cleaning agents, cleaning liquids and cleaning methods that effectively remove contaminants which are impossible to remove sufficiently with conventional cleaning liquids at the occurrence of a decrease in performances such as permeation flux and salt rejection rate due to contamination of permeable membranes, in particular aromatic polyamide RO membranes used in water treatment. Permeable membranes are cleaned with a cleaning liquid which is an aqueous solution including a chloramine compound and an alkali agent and having a pH of 10 or above. The chloramine compound is preferably one obtained by mixing a compound having a primary amino group with hypochlorous acid and/or a hypochlorite.

主权项

1. A cleaning agent for permeable membranes, wherein the cleaning agent consists of an aqueous solution comprising a chloramine compound and an alkali agent and having a pH of 13 or above.