Antiscalant treatments for water that is processed to remove organic contaminants
AssigneeChemtreat, Inc.
InventorsTom GURLEY, III, Jay Copeland, Vladimir Djukanovic
Life of this patent
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Abstract
Methods for treating a water system to prevent scaling. The water system includes water that is prone to scaling and that is processed to remove an organic contaminant with a GAC system and/or an IX system. Antiscalant compositions can be selected to reduce the amount of antiscalant that is adsorbed or otherwise removed in the contaminant removal system so that a sufficient amount of antiscalant composition remains in the water stream.
Claims18
A method for treating a water system to prevent scaling in the water system, the water system comprising (a) a water stream that (i) has a Langelier Saturation Index (LSI) of from 0 to 3 with respect to a scaling mineral;
- and (ii) includes an organic contaminant;
- (b) a granulated activated carbon (GAC) bed that contacts the water stream to remove the organic contaminant;
- and (c) an ion exchange (IX) bed that also contacts the water stream to remove the organic contaminant, the method comprising:
- combining at least a first antiscalant and a second antiscalant with the water stream, wherein the first antiscalant has a characteristic GAC adsorption that is less than 50% and wherein the second antiscalant has a characteristic IX adsorption that is less than 60%.
A method for treating a water system to prevent scaling in the water system, the water system comprising (a) a reverse osmosis (RO) system that treats a feedwater stream to produce an RO permeate stream and an RO reject stream, wherein the RO reject stream includes an organic contaminant;
- and (b) a contaminant removal system that treats the RO reject stream to remove the organic contaminant, the contaminant removal system comprises at least one of a granulated active carbon (GAC) bed and an ion exchange (IX) bed, the method comprising:
- combining an antiscalant composition with the RO reject stream, wherein the antiscalant composition comprises at least one antiscalant that has at least one of (i) a characteristic GAC adsorption that is less than 25%, and (ii) a characteristic IX adsorption that is less than 50%.
Dependencies are inferred from the claim text.