Mixed Bed Unit: The mixed bed unit contains a mixture of cation exchange resin and anion exchange resin. The cation exchange resin has a negative charge and attracts and removes positively charge ions (cations), while the anion exchange resin has a positive charge and attracts and removes negatively charge ions (anions). The mix bed unit is design to achieve high purity by removing any remaining traces of ions in the water.
Regeneration: Similar to the cation and anion exchange units in a DM plant, the mix bed resins will become exhaust over time and require regeneration to restore their capacity. The regeneration process involves passing regenerant chemicals, such as hydrochloric acid (HCl) and sodium hydroxide (NaOH), through the mix bed unit to remove the adsorb ions and regenerate the resin.
Polishing Treatment: In some cases, additional polishing treatment steps may be included after the mix unit to further enhance water quality. These may involve processes such as activate carbon filtration, ultrafiltration, or reverse osmosis to remove any residual impurities and achieve the desire level of water purity.