Demineralization Plant
Overview
Demineralized (DM) water is water from which virtually all dissolved mineral salts have been removed. It is essential in industries where even trace levels of dissolved ions can cause equipment damage, process contamination or product quality issues. Green Nature Solutions designs and supplies DM plants using ion exchange technology to produce high-purity demineralized water for boilers, pharmaceuticals, electronics, laboratories and industrial processes.
How It Works
Feed water is passed through a series of ion exchange resin beds that remove all dissolved cations (calcium, magnesium, sodium, potassium) and anions (chlorides, sulphates, nitrates, silica, bicarbonates) from the water.
Two-Bed DM Plant:
- Cation Exchanger – Feed water passes through strong acid cation resin (H⁺ form); all cations (Ca²⁺, Mg²⁺, Na⁺, K⁺) are exchanged for H⁺ ions, producing acidic water
- Degasser Tower – Removes CO₂ generated in the cation exchanger
- Anion Exchanger – Water passes through strong base anion resin (OH⁻ form); all anions (Cl⁻, SO₄²⁻, HCO₃⁻, SiO₂) are exchanged for OH⁻ ions
- DM Water Storage – High-purity DM water collected in storage tank
Mixed Bed Polisher (Optional): For ultra-high purity applications, DM water is further polished through a mixed bed unit (combined cation and anion resin) to achieve conductivity < 0.1 µS/cm.
Regeneration
- Cation Resin regenerated with Hydrochloric Acid (HCl) or Sulphuric Acid (H₂SO₄)
- Anion Resin regenerated with Sodium Hydroxide (NaOH / Caustic Soda)
- Regeneration frequency depends on feed water TDS and treated water volume
Types of DM Plants
| Type | Output Quality | Application |
|---|---|---|
| Two-Bed DM Plant | Conductivity 2–10 µS/cm | General industrial use |
| Two-Bed + Mixed Bed | Conductivity < 0.1 µS/cm | Pharma, electronics, labs |
| SAC + WBA + SBA | Medium purity | Boiler feed, process water |
| Continuous EDI | Ultra-pure, chemical-free | Semiconductor, pharma |
Applications
- Boiler feed water for power plants and process industries
- Pharmaceutical manufacturing (WFI pre-treatment)
- Electronics and semiconductor manufacturing
- Battery manufacturing
- Laboratories and analytical instruments
- Automotive painting and surface treatment
- Cooling tower make-up water
Key Features
- Produces water with conductivity as low as 0.1 µS/cm
- Suitable for high-pressure boilers requiring zero silica and hardness
- Co-current and counter-current regeneration designs
- Automatic PLC-based regeneration control
- Mixed bed polishing for ultra-pure water
- EDI (Electrodeionisation) option for chemical-free continuous demineralisation
- Complete skid-mounted design for easy installation
Technical Specifications
| Parameter | Details |
|---|---|
| Capacity Range | 100 LPH – 200 m³/hr |
| Feed TDS | Up to 2,000 ppm |
| Product Conductivity | 2 – 10 µS/cm (two-bed) / < 0.1 µS/cm (MB) |
| Silica in Product | < 0.02 mg/L (with mixed bed) |
| Resin Type | Strong acid cation + Strong base anion |
| Regenerant | HCl / H₂SO₄ (cation) + NaOH (anion) |
| Tank MOC | FRP / MS / SS |