Bisan Chemicals And Engineers Private Limited

We are the leading Manufacturer and trader of a best quality range of MB Plant, DM Plant, Water Softener,  etc. In order to manufacture these products, we use admirable quality components and advanced technology. In addition, the offered products are available in different specifications to meet specific requirements of customers. These offered products are widely appreciated for their features like easy installation, durability and longer life. 

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.

 

How a DM Plant Works (Ion Exchange Principle)

 

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).