Softening of produced water with Ion Exchange Resins has been done for many years. This paper briefly reviews these systems and introduces some new ion exchange systems such as Packed-Bed applied to the softening of produced water. The impact of brine hardness is discussed describing the possible merits of using softened brine. These new techniques have lead to re-evaluating the selection of equipment, especially for water with a TDS of 4000 to 7000 ppm.

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