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CLEANING AGENT, CLEANING LIQUID AND CLEANING METHOD FOR REVERSE OSMOSIS MEMBRANE
CLEANING AGENT, CLEANING LIQUID AND CLEANING METHOD FOR REVERSE OSMOSIS MEMBRANE
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机译:反渗透膜的清洗剂,清洗液及清洗方法
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摘要
Provided are a cleaning agent and a cleaning liquid that prevent a reduction in the rejection rate of an RO membrane which may occur when the RO membrane is cleaned and a method for cleaning an RO membrane with the cleaning liquid. The agent for cleaning an RO membrane includes a urea derivative. The urea derivative preferably includes urea (H 2 N-CO-NH 2 ) and/or biuret (H 2 N-CO-NH-CO-NH 2 ). The cleaning liquid is an aqueous solution produced by diluting the cleaning agent. The method for cleaning an RO membrane uses the cleaning liquid. Urea and biuret have a structure analogous to amide bonds included in aromatic polyamide RO membranes, and have a strong affinity for amide bond portions. Urea and biuret adsorb onto the amide bond portions, and prevent the amide bonds from being broken by the cleaning liquid.
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