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Removal of Salts from Water by Ion Exchange

The major portion of total dissolved solids (in water) is mineral salts, such as calcium bicarbonate, magnesium sulphate, and sodium chloride.  When dissolved in water, salts are dissociated into cations and anions eg. Sodium Chloride (NaCl) in solution is dissociated into Na+, Sodium Cation and Cl-, Chloride Anion.

Since deionisation requires the removal of both the negatively charged anions and the positively charged cations, both cation and anion exchange resins are required.

Abtech deionisers are fixed bed systems in which the ion exchange resins are contained in pressure tanks, and the water to be deionised is forced through the resin.

The cation and anion exchange resins have a specific capacity to remove a known amount of ionisable solids.

After a service run, the resins become exhausted, and are unable to remove additional ions.

When the resins are exhausted, they must be regenerated to restore their ion exchange capacity.


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The Twin Column (Two Bed) Ion Exchange Demineraliser

The Twin Column Ion Exchange Demineraliser consists of two resin tanks or columns.

The first column contains strong acid cation exchange resin in the hydrogen form.

The second column contains anion resin in the hydroxide form.

Two main types of Anion Resins are available.

  • Strong base anion resin units remove all anions including silica and carbon dioxide.
    They typically produce a deionised water with a pH greater than 7, and the amount of silica remaining is usually less than 0.2 mg/L.
  • Weak base anion units are used when removal of silica and carbon dioxide is not required.
    Weak base anion resin has a higher capacity at lower regeneration consumption.
    Since they do not remove carbon dioxide, they typically produce deionised water with a pH lower than 7.


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Mixed Bed Deionisers

Mixed bed units contain intimately mixed cation and anion resin in a predetermined ratio that produces extremely high quality water.

Mixed bed unit pH is typically 7.0 before the water is exposed to the atmosphere, because of the almost complete deionisation that occurs.


To learn more about Deionisers visit Abtech's Learning Centre. 


Contact Abtech for all your Deioniser needs.


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Flowrates to 95 L/min

TCA-A Specification Sheet

TCA-A Deioniser








High Efficiency, High Purity
Countercurrent Regeneration


TCA-CC Specification Sheet

TCA-CC Deioniser






TCX & DIMX Exchange Tank Systems

No Site Regeneration
No Dangerous Chemicals
Or Wastewater on Site

TCX & DIMX Specification Sheet






Abtech advise you should not attempt final equipment selection, leave that to us! 












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This page was last updated on the 15th of January 2002
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