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Ion Exchange Deionizers

The most common ions present in water are Calcium (Ca2+), Magnesium (Mg2+), Sodium (Na+), Potassium (K+), Bicarbonate (HCO3-), Sulphate (SO42-), Chloride (Cl-) and Silicate (SiO44-). High concentrations of these ions result typically in hard water (specifically Calcium Carbonate), brackish water and high salt content water.

These Ions are removed from water by means of an Ion exchange resin or Ion exchange membrane. Deionization is often also referred to as Demineralization. 

The cationic resin is typically made from styrene containing negatively charged Sulfonic acid groups. This resin will attract the positively charged Ions in the water (Ca++, Mg++, Na+, etc.) and release an equivalent amount of Hydrogen (H+) Ions.

The anionic resin is typically also made from Styrene, but contains positively charged Quaternary Ammonium groups. This resin will attract the negatively charged Ions (HCO3-, Cl-, SO4--, etc.) and release an equivalent amount of Hydroxide (OH-).

Alternatively, ion exchange membrane that selectively allows certain ions to pass through is used and an electrical current is passed through the water, causing the Ions in the water to move and separating them into Cations and Anions. 

Resins have limited capacities and must be regenerated upon exhaustion. This occurs when equilibrium between the adsorbed Ions is reached. Cation resins are regenerated by treatment with Hydrochloric Acid (HCl) which replenishes the adsorption sites with H+ Ions. Anion resins are regenerated with Sodium Hydroxide (NaOH) which replenishes the resin with OH- Ions.

Our Deionization Water Systems:

Any Flow Rates can be accommodated

Our Standard plant range offerings are:  1.5m³ p. Hr | 3 m³  p. Hr | 4 m³  p. Hr | 10m³  p. Hr | 18m³  p. Hr

Mixed Bed Plant

Manual or Automatic conductivity controlled. Once exhausted - resin simply replaced. (No chemicals required) Suitable for small use applications & polishing Reverse Osmosis permeate or Deionization Service Water.

Conventional Cation & Anion Exchange Systems

Standard “long” regeneration times are generally between 2 to 3 hours

Short Cycle Cation & Anion Exchange Plant

Latest DI technology running off client specified PLC – Only 35 minutes regeneration time – Saves time / Chemical consumptions / PH neutral effluent stream, therefore less loading on your effluent plant.

Conventional Co-Flow

Top to Bottom units & counter current (up-flow type plants)

Deionization Solutions

Metal Finishing Plants | Automotive Industry | Pharmaceutical Industry | Battery Plant Manufacturing | Boiler Feeds Water Conditioning | Detergent Savings, i.e. Laundries | Polishing Reverse Osmosis Water | Manufacturing Plants | Closed Circuit Pre-Treatment | Packaged Plants, Pre-commissioned & Skid Mounted Available | Various Sizes Available – to suit flow requirements | Full range of GRP Vessels & Lined Steel Vessels are offered | Multiple Valve Configurations - Manual, Semi-Auto to Fully Automated | PLC Controlled Options Available | Various Pressure Ranges are Accommodated | Full Installation or Maintenance & Servicing options are available | Resin Changes