DM Plant

Demineralization is the process of removing mineral salts from Water by using the ion exchange method. Demineralised Water  is completely free  or almost of dissolved minerals .

Demineralized Water also known as Deionized Water,  has had its mineral ions removed. The most commonly  present Mineral ions in water are  calcium, magnesium, sodium, iron,  chloride, sulphate, carbonates , nitrate, etc. 

Demineralization  is a physical process which uses ion exchange resins process  for the replacement of the mineral salts in Water with H+ and OHions. As  the most of water impurities are dissolved salts, demineralization produces a very high purity Water that is generally similar to distilled Water. This process is quick and without scale buildup . DM water treatment technology is the proven process for pre treatment of Water. A Demineralization plant produces mineral free Water by  ion exchange, Degasification, and polishing. Demineralized Water System has various application in the field of steam, power, pharmaceuticals , process, and cooling.

Demineralization Principle :
In pre treatment of  Raw water,  Raw Water is passed through  two ion exchange resins beds. While the cations get exchanged with hydrogen ions in first Cationic bed or cation resin vessel , the anions are exchanged with hydroxyl ions, in the second one known as anionic bed or anion resin vessel.

Demineralization Process :
Ion-exchange is a fast and reversible process in which  ionic  impurities present in the Water are swapped  by ions released by an ion-exchange resin. The impurities are taken up by the resin, which must be periodically regenerated to restore it to the original ionic form. Following ions are found in water :


  • Calcium (Ca2+)                                                                                                                                      
  • Magnesium (Mg2+)
  • Sodium (Na+)
  • Potassium (K+)


  • Carbonate (CO32-)
  • Bicarbonate (HCO3-)
  • Chloride ( Cl)
  • Nitrate (NO3-)

Ion Exchange Resins used in DM Plants :   Two basic types of resin used in deionization  system  are – cation resin  and anion resin . Cation exchange resins will release Hydrogen ions or other positively charged ions in exchange for other cationic impurities  present in the Water while  Anion exchange resins will release hydroxyl ions or other negatively charged ions in exchange for anionic impurities present in the Water.

Ion-exchange technology  in Water treatment and purification :

Firstly , cation exchange resins alone can be used to soften water ; secondly, anion exchange resins  can be used for nitrate removal or organic scavenging ; and thirdly a mixed- bed , combinations of cation-anion exchange resins can be used to remove virtually all the ionic impurities present in the raw  water, a process known as deionization. Water deionizers purification process results in water of exceptionally high quality and low in TDS.

For many laboratory, pharmaceuticals  and industrial applications, high-purity Water which is  free from ionic impurities is required. Water of this quality can be produced by Demineralization plants .The two most common types of deionization are :
• Two-bed deionization
• Mixed-bed deionization

Two-bed deionization
The two-bed deionizer consists of two vessels in DM Plant – First one  containing a cation-exchange resin in the hydrogen  form and the other containing an anion resin in the hydroxyl form. Water flows through the cation column first , whereupon all the cations are exchanged for hydrogen (H+) ions. Water is  electrically balanced as , for every mono valent cation, e.g. Sodium , one (H+) ion is exchanged and for every divalent cation, e.g. Ca2+, two hydrogen ions are exchanged. The same principle applies when considering anion-exchange. Water free of cation  then flows through the anion bed . This time, all the negatively charged ions are exchanged for (OH) which then combine with the hydrogen ions to form Water .

Mixed-bed deionization
In DM Plant , mixed-bed deionizers unit has  the cation-exchange and anion-exchange resins are  mixed and contained in a single pressure vessel. The mixture of cation- anion exchange resin  in a single a vessel  makes a mixed-bed deionizer equivalent to a series of two-bed plants. Therefore , the Water quality obtained from a mixed-bed deionizer is  superior than that produced by a two-bed plant. Mixed-bed is normally used to ‘polish’ the Water to higher levels of purity in terms of TDS and conductivity after it has been initially treated by either a two-bed deionizer or a reverse osmosis unit.

Advantages :

  • Variety of cost effective  models.
  • User friendly, low maintenance and easy to install.
  • Simpler distribution and collection systems.
  • Top mounted, side mounted multiport valves  with the necessary high pressure  PVC piping.
  • Single valve operation .
  • Rust free
  • Less electricity consumption
  • Durable
  • Economical                                                                                                                                                              Major Applications of DM Plants :
  • Boilers feed Water, Pharmaceuticals ,Textiles, Chemicals, Breweries, Swimming pools, Potable Water, Hospitals, Automobile, and Battery, Fertilizers, pharmaceuticals , Food industries.
    •  Ion Exchange Plants  •Water Softener Plant  • Industrial DM Plant   • Two Stage & Multi Stage DM Plants  • Mix Bed  DM Plant  • De-Gasifier  • manual/Automatic Plant  • Pharmaceutical Industry   • Textile Industries• Chemical Industries

PRISTINE offers   excellent quality Demineralization Plant customized  as per needs

     Subscribe to our mailing list