Discussion
The commonly used regenerator in Zeolite process is:
Answer: A
When the zeolite bed (sodium zeolite, Na2Z) has exchanged all its sodium for the Ca and Mg ions of hard water, it is regenerated by passing a concentrated brine solution of NaCl (about 10 percent) over it. The large excess of sodium ions reverses the exchange and restores Na2Z. Dilute H2SO4 and dilute HCl are regenerants for the hydrogen (cation) exchange resins of a demineralisation plant, and dilute NaOH is used to regenerate the anion exchange resin, not the zeolite softener.
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