De-Mineralization Plants

Demineralization or Deionisation is the process of removing mineral salts from water by using the ion exchange process. With most natural water sources it is possible to use Demineralisation and produce water of a higher quality than conventional distillation. We manufacture a Wide range of Dematerializing plants for industrial process water applications. They are available in different sizes and materials, manually operated, Semiautomatic or fully Automatic.We are also dong revamping of old plants.

Principle of Operation :

A Typical two-bed DM Plant consists of two MS Rubber lined Pressure vessels connected in series along with its internal fittings. The first unit consists of high capacity strongly acidic cation exchange resin, which converts positive ions of salt and replaces them with hydrogen ions to form respective acids, which are absorbed in next vessel by strongly basic anion exchange resin. The water obtained by this process shows conductivity less than 20 µ S / cm at 25 Deg C and total dissolved solids less than 10 ppm. Further high purity water can be achieved by Mixed Bed Deionisers, which are designed to produce high purity treated water. They can be used as polishing units after two bed DM Plant to obtain high purity water. Mixed Bed Deionisers are single column units, filled with strongly acidic cation and strongly basic anion exchange resins mixed together.

There are four distinct stages in the operation of Deionisers

Service Backwashing Regeneration Rinse/remix

Process : 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. The impurity ions are taken up by the resin, which must be periodically regenerated to restore it to the original ionic form. (An ion is an atom or group of atoms with an electric charge. Positively-charged ions are called cations and are usually metals; negatively-charged ions are called anions and are usually non-metals). The following ions are widely found in raw waters : Cations Anions Calcium (Ca2+) Chloride ( Cl-) Magnesium (Mg2+) Bicarbonate (HCO3-) Sodium (Na+) Nitrate (NO3-) Potassium (K+) Carbonate (CO32-) Ion Exchange Resins : There are two basic types of resin - cation-exchange and anion-exchange resins. Cation exchange resins will release Hydrogen (H+) ions or other positively charged ions in exchange for impurity cations present in the water. Anion exchange resins will release hydroxyl (OH-) ions or other negatively charged ions in exchange for impurity anions present in the water. The application of ion-exchange to water treatment and purification. There are three ways in which ion-exchange technology can be used in water treatment and purification : first, cation-exchange resins alone can be employed to soften water by base exchange; secondly, anion-exchange resins alone 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 feedwater, a process known as deionization. Water deionizers purification process results in water of exceptionally high quality Deionization : For many laboratory and industrial applications, high-purity water which is essentially free from ionic contaminants is required. Water of this quality can be produced by deionization.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 - one containing a cation-exchange resin in the hydrogen (H+) form and the other containing an anion resin in the hydroxyl (OH-) form. Water flows through the cation column, whereupon all the cations are exchanged for hydrogen ions. To keep the water electrically balanced, for every monovalent cation, e.g. Na+, one hydrogen ion is exchanged and for every divalent cation, e.g. Ca2+, or Mg2+, two hydrogen ions are exchanged. The same principle applies when considering anion-exchange. The decationised water then flows through the anion column. This time, all the negatively charged ions are exchanged for hydroxide ions which then combine with the hydrogen ions to form water (H2O). Mixed-bed deionization : : In mixed-bed deionizers the cation-exchange and anion-exchange resins are intimately mixed and contained in a single pressure vessel. The thorough mixture of cation-exchangers and anion-exchangers in a single column makes a mixed-bed deionizer equivalent to a lengthy series of two-bed plants. As a result, the water quality obtained from a mixed-bed deionizer is appreciably higher than that produced by a two-bed plant. Although more efficient in purifying the incoming feedwater, mixed-bed plants are more sensitive to impurities in the water supply and involve a more complicated regeneration process. Mixed-bed deionizers are normally used to ‘polish' the water to higher levels of purity after it has been initially treated by either a two-bed deionizer or a reverse osmosis unit. Electrodeionization EDI : Electrodeionization Systems remove ions from aqueous streams, typically in conjunction with reverse osmosis (RO) and other purification devices. Our high-quality deionization modules continually produce ultrapure water up to 18.2MW/cm. EDI may be run continuously or intermittently Advantages : • Variety of cost effective standard models. • Improved aesthetics and rugged design. • User friendly, low maintenance and easy to install. • Simpler distribution and collection systems. • Quick availability. • Pre dispatch assembly check. • The multiport valves are top mounted as well as side mounted with the necessary high pressure rating PVC piping. • Single valve operation as compared to the six valves in conventional filters • Each operating step is clearly marked on the valve, thereby eliminating chances of error in the operating sequence. • Single valve assembly, with its simplified frontal Piping, simpler distribution collecting systems is Very easy to install. • Rust free • Less power consumption • Durable • Economical • High shelf life Major Applications : • Boilers feed water, Textiles, Pharmaceuticals, Chemicals, Breweries, Swimming pools, Potable Water, Hospitals, Automobile, and    Battery, Fertilizers. • Ion Exchange Plants    - Softener    - Industrial DM Plant    - Two Stage & Multi Stage DM Plants    - Mix Bed Demineraliser    - De-Gasifiers    - Cation Polisher    - Manual/Automatic Plants    - Pharmaceutical Industry    - Power Plant    - Oil & Gas sector    - Chemical Industries    - Textile Industries Service :

In the Service cycle the water enters the vessel and passes through the Resin bed of the respective exchanger.

Backwashing :

After the resins are exhausted, the bed is backwashed. Backwashing is carried out by a uniform upward flow of water through the resin bed. The backwash step expands the resin bed releasing any entrapped particulate matter & removes the channeling in the resin column if occurred during the service cycle.

Regeneration :

When the ion exchange resins loose all the exchangeable ions, they require regeneration to restore them back to hydrogen or hydroxyl form depending upon whether they are cation or anion resins. To achieve this 4 - 5% concentrated solution of Hydrochloric acid is used for cation resin and a 4% - 5% concentrated solution of caustic soda for anion resin.

Rinse:

The final stage of regeneration is to rinse the resins of excess regenerant.

We Offer:

Pacific Enviro offers excellent quality Demineralization Plant manufactured through technically advanced process. Demineralization Water Treatment Plant, provided by our company, is highly demanded in various industries and municipal sectors. Today, we are regarded as one of the trusted Demineralization Water Plant Exporters.