| abstract |
A cleaning agent having an effect of suppressing a decrease in the blocking rate of the RO membrane by washing contains a basic or hydrophobic amino acid, a peptide containing these amino acids as constituent amino acids, or a derivative thereof as a membrane protecting agent. Furthermore, you may contain the 1 type(s) or 2 or more types chosen from the group which consists of an alkali agent, a combined chlorine agent, and an oxidizing agent. As an amino acid, arginine, lysine, and phenylalanine are preferable. A cleaning solution comprising an aqueous solution in which this cleaning agent is diluted. A method for cleaning RO membranes using this cleaning solution. |