Scale inhibitor for reverse osmosis membranes and reverse osmosis membrane treatment method
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United States of America Patent
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Aug 11, 2020
Grant Date -
Jan 31, 2019
app pub date -
Sep 12, 2016
filing date -
Mar 24, 2016
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Abstract
Provided is a scale inhibitor for RO membranes which effectively inhibits the precipitation of calcium carbonate in an RO membrane treatment without increasing the phosphorus concentration in effluent and which can be used even in the RO membrane treatment of feed in which high-M-alkalinity concentrate having a calcium hardness level of 100 to 600 mg/L-CaCO3 and an M alkalinity of 1000 to 16000 mg-CaCO3/L is produced. A scale inhibitor for reverse osmosis membranes which inhibits the formation of calcium carbonate scale in an RO membrane treatment, the scale inhibitor including components (A) and (B) below. An RO membrane treatment method including adding the scale inhibitor for RO membranes to RO feed. Component (A): Terpolymer of maleic acid, an acrylic acid alkyl ester, and vinyl acetate, Component (B): Homopolymer of carboxylic acid
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