A low-pressure RO membrane system treating a brackish ground water is operating at 85% recovery. The rejection for both barium and sulfate is 90%. The feed water contains –0 05 mg/l of barium and 20 mg/l of sulfate, and the Ksp for BaSO4 is 1 × 10-10. Find the concentration of barium and sulfate in the concentrate and determine if the solubility of BaSO4 is exceeded.
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