Method for inhibiting scale formation and/or dispersing iron in reverse osmosis systems

摘要

A method for inhibiting calcium sulfate scale formation and deposition and/or dispersing iron from a feedstream passing through a reverse osmosis system which comprises the steps of: controlling the pH of the feedstream within the range between about 6.0 to about 7.0; controlling the temperature of the feedstream within the range between about 50 DEG to about 80 DEG F.; and adding a scale inhibitor and/or iron dispersant to the feedstream in an amount between about 0.002 ppm per ppm hardness (as CaCO3) of the feedstream to about 0.005 ppm per ppm hardness (as CaCO3) of the feedstream, the scale inhibitor comprising a water-soluble organic phosphonate, an N-substituted acrylamide polymer, caustic and water.