| abstract |
Provided is a cleaner having the effect of minimizing the decline in the blocking rate of an RO membrane due to cleaning, the cleaner including a basic or hydrophobic amino acid, a peptide including these amino acids as constituent amino acids, or a derivative thereof as a protective agent of the membrane. The cleaner may additionally include one or more agents selected from the group consisting of alkali agents, combined chlorine agents, and oxidants. The amino acid is preferably arginine, lysine, or phenyl alanine. Also provided is a cleaning solution comprising a diluted aqueous solution of the cleaner. Also provided is a method for cleaning an RO membrane, using this cleaning solution. |