Dew India

DEMINERALISERS

DEW is a leading manufacturer of industrial water demineraliser and deionizer (DI) equipment designed for the economical and efficient removal of dissolved salts and minerals. These water treatment systems produce high purity water for commercial and industrial applications. DEW designs and manufactures a complete line of DM systems to meet your water quality requirements.

DEW Deionizers

DEWTEX Series two-bed deionizers are available as standard pre-engineered units or as custom designed systems with the flexibility to meet a wide range of requirements. These DM Plant can be manufactured with a full range of options and related equipment to provide fully integrated water purifications systems. DEWTEX Series two bed deionizers are a highly efficient means of removing dissolved minerals and solids to produce high purity DM water.

Industrial and Commercial Applications

DEWTEX Series deionizers for industrial applications are designed for fully or semi-auto production of water with a conductivity of less than 10 micro-ohms and feature:

  1. Unlimited Flow Rate and Capacities
  2. Strong acid cation and type 2 strong base anion resins as the standard, with other resins available as an option.
  3. Microprocessor based control system with conductivity monitor and flow sensor for regeneration initiation.
  4. Standard Electrical enclosures
  5. FRP and steel depending on size and customer requirements.
  6. Optional ASME code vessels.
  7. Factory assembled and skid mounted for quick installation and minimum startup cost.
  8. Schedule 80 PVC piping package including air operated true union ball valves are standard. Air or electric actuated ball or butterfly valves are available as an option.
  9. Pressure regulators, rotameters and metering valves supplied for accurate and safe control of regeneration water and chemical introduction.
  10. Internal distributors are corrosion resistant, designed for optimum efficiency and are fully supported where required.

Why use a Water Demineralizer / Deionizer?

The deionization process removes ions (cations and anions), dissolved solids and gases, including:

  • Sodium, calcium, and magnesium (cations)
  • Sulfates, alkalinity, chlorides, carbon dioxide, and silica (anions)

Deionization is accomplished by passing water through ion exchange columns containing cation and anion resins. Simply put, the result is water without ions minerals and salts.

Applications for Industrial and Commercial DI Water Systems

The following facilities are examples of ideal applications for water demineralizer and deionizer (DI) equipment:

  • Food and Beverage Processing Plants
  • Power plants
  • Chemical plants
  • Pharmaceutical Plants
  • High pressure boiler feedwater
  • Manufacturing Plants
  • Laboratories
  • Autoclaves
  • Steam Generators
  • Electronic Products
  • Medical Device Production
  • Alloy Metal Fabrication
  • Aerospace
  • Humidification Systems
  • Metal Treating
  • Plating
  • Printed Circuit Boards

Terminology for DM Plants

Deionisers, de-ionisers, demineralizers, and de-mineralizers are the different names for the same equipment. DI is often used as the abbreviation for De-Ionization or De-Ionizers. You will also hear this equipment called DM Plants, DI water systems, DI cells, or DI water treatment systems.

Important

Understanding the chemistry of water is critical in designing a Demineraliser. A wrong selection of system may lead to low efficiency, high capital and operating cost and poor quality of product.

It is recommended to use a membrane technologies such as UF and Reverse osmosis prior to demineralisers where TDS is more than 400 ppm.

The Demineraliser are available in following configuration :

Two Bed System

Used for small capacity low TDS water. The advantage of packed bed is compact plant , total utilization of vessel space and better quality of water.

Three Bed System including Degasser Unit

This type of system is used for high alkalinity water. Carbon dioxide is removed during degasification reducing the load on anion exchange resin

Four Bed System including Degassification Unit and Mixed Bed

For high capacity plants having silica , EMA contents in raw water , a three bed system with degassifier is often the most economical to operate.