Demineralization Plant


Demineralization Plant



Demineralization is the process of removing ionic minerals from water. While it can refer to all water-purification processes that remove minerals, the term demineralization is designated to only those processes that remove near total amounts of ionic minerals. Mineral ions such as cations of sodium, calcium, iron, copper, etc and anions such as chloride, sulphate, nitrate, carbonate, bicarbonate etc are common ions present in water. It is common for deionization and demineralization to be used interchangeably.

In the context of water purification, ion-exchange is a rapid and reversible process in which impurity ions present in the water are replaced by ions released by an ion-exchange resin. There are two types of resins – anion exchange resins and cation exchange resins. The former resin releases hydroxyl ions, which are negatively charged ions. The cation resins release hydrogen ions which are usually positively charged ions. The impurity ions are taken up by the resin, which must be periodically regenerated to restore it to the original ionic form.

How DM Plant work

There are three ways in which ion-exchange technology can be used in water treatment and purification. As a first step, cation-exchange resins can be used to soften water by base exchange; as a second step, anion-exchange resins can be used for organic scavenging or nitrate removal; and thirdly, combinations of cation-exchange and anion-exchange resins can be used to remove virtually all the ionic impurities present in the feed water, a process known as deionization. Water deionizers purification process results in Water of exceptionally high quality.

When all the exchangeable hydrogen ions and hydroxyl ions of the cation and anion exchange resins get exchanged with the cations and anions present in the water, the ion exchange resins are said to be exhausted. Then they are regenerated using dilute HCl and dilute NaOH solutions.


Benefits of DM

  • Process can be used to soften highly acidic or alkaline water
  • Produce water of very low hardness
  • Water softened by this process is good for high pressure boilers

Industries where DM can be used in?

  • Power industry
  • Refinery
  • Petrochemical and chemical
  • Pharmaceuticals
  • Mining
  • Textile

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