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AssigneeKurita Water Industries Ltd.
InventorsKunihiro HAYAKAWA, Takahiro KAWAKATSU
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To provide a method for improving a rejection rate of an RO membrane, which further improves the stability of removal performance (rejection rate) and flux stability (sustainability of contamination resistance). In a method for improving a rejection rate of an RO membrane, including a step of allowing an aqueous solution containing a polyphenol to pass through an RO membrane, the method further includes a step of allowing an aqueous solution containing at least one type selected from the group consisting of a modified poly(vinyl alcohol), a high molecular polysaccharide, and a poly(amino acid) to pass through the RO membrane. The method preferably further includes a step of allowing an aqueous solution containing an organic compound having an amino group and having a molecular weight of 1,000 or less to pass through the RO membrane.
A method for improving a rejection rate of a reverse osmosis membrane, the method comprising a step of allowing an aqueous solution containing a polyphenol to pass through a reverse osmosis membrane, wherein the method further comprises a step of allowing an aqueous solution containing at least one type selected from the group consisting of a modified poly(vinyl alcohol), a high molecular polysaccharide, and a poly(amino acid) to pass through the reverse osmosis membrane.
A rejection rate improving agent for a reverse osmosis membrane, the agent comprising a polyphenol and at least one type selected from the group consisting of a modified poly(vinyl alcohol), a high molecular polysaccharide, and a poly(amide acid).
Dependencies are inferred from the claim text.