Bisan Chemicals And Engineers Private Limited

A Demineralisation (DM) Treatment Plant, also known as a Deionization (DI) Plant, is a water treatment system that removes dissolved mineral salts (ions) from water. The process achieves a very high level of water purity, making it suitable for applications where even trace amounts of dissolved solids can be detrimental.

Natural water, including municipal tap water, always contains dissolved mineral salts (like calcium, magnesium, sodium, chlorides, sulfates, bicarbonates, silica, etc.). While generally harmless for drinking, these minerals can cause significant problems in industrial applications:

• Scaling: In boilers, cooling towers, and heat exchangers, dissolved minerals (especially hardness and silica) precipitate out as hard scales, reducing heat transfer efficiency, increasing energy consumption, and leading to equipment damage and premature failure.

• Corrosion: Certain ions (e.g., chlorides, sulfates) can accelerate corrosion of metal surfaces in pipes and equipment.

• Product Contamination: In industries like pharmaceuticals, electronics, food & beverage, and chemical manufacturing, even trace impurities can affect product quality,

Being leaders in the market, we are providing Industrial Demineralized Water Plant. The offered water plant removes dissolved solids or minerals from process streams and feed water. Apart from this our customers can avail this Automatic Demineralized Water Plant in several specifications. This plant is widely demanded in making water drinkable and free from toxic contaminants. 

A Demineralisation Plant (DM Plant), often referred to as a Deionization (DI) Plant, is a water treatment system specifically designed to remove dissolved mineral salts and other ionized impurities from water. The output, known as demineralized water or deionized water, is characterized by its very low conductivity and high purity, making it crucial for a wide range of industrial and laboratory applications where even trace amounts of minerals can be detrimental.

Unlike a typical water softening plant which only removes hardness ions (calcium and magnesium), a DM plant aims for a much higher level of purity by removing all dissolved ionic contaminants.

The core principle behind most DM plants is ion exchange. Water naturally contains dissolved salts, which dissociate into positively charged ions (cations) and negatively charged ions (anions). A DM plant typically uses two or more vessels filled with specialized synthetic resins to exchange these undesirable ions for hydrogen (H+) and hydroxide (OH-) ions, which then combine to form pure water (H2O).

Here's a breakdown of the typical stages:

1. Pre-treatment:

   • Raw water (feed water) often undergoes pre-treatment to remove suspended solids, turbidity, organic matter, and chlorine. This protects the sensitive ion exchange resins from fouling and damage, extending their lifespan.

   • Common pre-treatment steps include:

     • Multi-Media Filters (MMF) / Pressure Sand Filters (PSF): To remove larger suspended particles.

     • Activated Carbon Filters (ACF): To remove chlorine, organic matter, and improve taste/odor.

     • Microfiltration (MF) or Ultrafiltration (UF): Sometimes used for more effective removal of suspended solids and colloids as pre-treatment.

     • Anti-scalant Dosing: To prevent scaling on membranes if RO is used as pre-treatment.

2. Cation Exchange Unit (Strong Acid Cation - SAC):

   • The pre-treated water first enters a vessel containing strong acid cation (SAC) resin.

   • This resin is typically in the hydrogen (H+) form.

   • As water passes through, all positively charged ions (cations) like Calcium (Ca²⁺), Magnesium (Mg²⁺), Sodium (Na⁺), Potassium (K⁺), Iron (Fe²⁺/Fe³⁺), etc., are exchanged for H+ ions from the resin.

   • The effluent from this unit is acidic (due to the presence of H+ ions) and contains acids corresponding to the original salt anions (e.g., HCl, H2SO4).