SCALE INHIBITING METHOD AND MAGNESIUM HYDROXIDE SCALE INHIBITOR FOR REVERSE OSMOSIS MEMBRANE

摘要

To provide: a scale inhibiting method which can minimize the formation of magnesium hydroxide scale in water treatment using a reverse osmosis membrane without a remarkable increase in the phosphorus concentration of effluent; and a magnesium hydroxide scale inhibitor for a reverse osmosis membrane. This scale inhibiting method includes: adding, to an aqueous system to be treated with a reverse osmosis membrane, a copolymer which is obtained by polymerizing a monomer component that comprises both (meth)acrylic acid and 2-(meth)acrylamido-2-methylpropane- sulfonic acid and which has a weight-average molecular weight of 1000 to 50000; and thus inhibiting the formation of magnesium hydroxide scale in the water treatment using a reverse osmosis membrane.