Problem- A strong-acid cation exchanger is employed to remove calcium hardness from water. Its wet-volume capacity is 2.0 eq/L in the sodium form. If calcium concentrations in the influent and effluent are 44 mg/L (2.2 meq/L) and 0.44 mg/L (0.22 meq/L), respectively find the maximum volume of water that can be treated per liter of resin. The water has the following composition in meq/L. The selective coefficient for calcium over sodium is 2.6. Ca2+ 2.2 meq/L Mg2+ 1.0 meq/L Na+ 3.0 meq/L HCO3- 2.9 meq/L Cl- 3.1 meq/L SO4-2 0.2 meq/L
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