Zeolite 3A, used for ammonium (NH4⁺) adsorption, can be regenerated by a chemical ion-exchange process. During operation, ammonium ions replace sodium ions within the zeolite structure. To regenerate the zeolite:
Backwashing: A reverse water flow clears debris.
Chemical Regeneration: A concentrated sodium chloride (NaCl) solution is flushed through the zeolite. The sodium ions displace the adsorbed ammonium ions.
Rinse: The zeolite is rinsed with water to remove the ammonium and excess salt, restoring its ion-exchange capacity.
This process can be repeated multiple times to extend the life of the zeolite in ammonium removal applications.