What is a DM Plant?

The DM Plant (Demineralization Plant) is a water treatment system which almost completely removes all dissolved minerals, salts and ionic impurities from water. The process is based on ion exchange technology in which the unwanted ions such as calcium, magnesium, sodium, chlorides, sulphates and nitrates are exchanged for hydrogen and hydroxyl ions. This produces very pure water.

Demineralized water is important in industries where mineral deposits, scaling and conductivity can degrade equipment performance, product quality and operational efficiency. DM plants produce water of very low conductivity required for sensitive industrial applications and is far better than conventional filtration systems.

DM water is used routinely in power plants, pharmaceutical production, laboratories, electronics manufacturing, chemical plants and boiler feed where high purity water is critical..

Types of DM Plants Offered by Unilax

Unilax Industries manufactures and supplies various demineralization plants according to water quality, purity requirements and production capacity.

Two Bed DM Plant

A Two Bed DM Plant consists of separate cation and anion exchange units which remove dissolved ionic contaminants from water. These systems are well suited for most industrial applications requiring low conductivity water.

Mixed Bed DM Plant

Mixed Bed Demineralization Plants These plants produce ultra-pure water. They utilize a single vessel containing both cation and anion resins. They are often used as a polishing unit following a two-bed DM system.

Automatic DM Plant

DM plants are provided with PLC based control systems with fully automatic controls and regeneration.

Manual DM Plant

DM plants of manual type are a cost effective solution for small and medium scale industries that require reliable demineralized water production.

Skid-Mounted Compact DM Plant

Skid-mounted compact systems are ideal for laboratories, research centers, pharmaceutical units and applications with limited space for installation.

Customized Industrial DM Plants

We design tailor made DM systems along with RO Plants, Water Softening Plants, ETPs, STPs, dosing systems and other water treatment technologies based on specific project requirements.

Working Principle of DM Plants

The demineralization process involves multiple stages of ion exchange to remove dissolved impurities from water.

Stage 1 – Cation Exchange Process

Raw water first passes through a cation exchange vessel containing specialized resin. This resin removes positively charged ions such as calcium, magnesium, sodium, and iron, replacing them with hydrogen ions.

Stage 2 – Anion Exchange Process

The water then enters the anion exchange vessel where negatively charged ions such as chloride, sulphate, nitrate, bicarbonate, and silica are removed and replaced with hydroxyl ions.

Stage 3 – Formation of Pure Water

Hydrogen ions and hydroxyl ions combine to form pure water molecules, resulting in highly purified demineralized water with low conductivity.

Stage 4 – Mixed Bed Polishing (Optional)

For applications requiring ultra-high purity water, a mixed bed unit is installed as a polishing stage to further reduce conductivity and residual silica.

Resin Regeneration

Once the ion exchange resins become exhausted, they are regenerated using acid and alkali solutions to restore their ion exchange capacity and maintain consistent performance.