Patent ID: 6372143
Filing Date: 2002-04-16
Classification: B01D,B01J,C02F

Abstract:
A method for treating produced water to lower the total dissolved solids (TDS) of the water for safe environmental discharge comprising the steps of:passing the produced water through a cation exchange resin in a H+ form to remove cations and form a first discharge stream and a solids loaded resin; discharging the first discharge stream to the environment; regenerating the solids loaded resin to a H+ form with a dilute acid solution to remove solids from the solids loaded resin into the dilute acid stream forming an acid regenerated waste stream and an acid regenerated resin; rejecting the acid regenerated waste stream to a deep well, rinsing the acid regenerated resin with water to remove residual salts from the acid regenerated resin forming a residual salt containing rinse stream; passing the residual salt containing rinse stream into a salt separation unit forming a high salt containing reject stream and a low salt containing product discharge water stream; rejecting the high salt containing reject stream to a deep well; and discharging the low salt containing product water discharge stream to the environment.