Hydrocons High Purity Water Systems Logo

Products - RO-EDI System

RO-EDI System
More Photos
Thumbnail 1 Thumbnail 2 Thumbnail 3 Thumbnail 4 Thumbnail 5  
Click on the image/thumbnail to englarge it

Hydrocons offers Reverse Osmosis system with spirally wounded composite membrane with FRP or stainless steel RO housing for the membrane. The system is provided with proper pre treatment to ensure the safety of the RO membrane & to obtain maximum overall recovery from the system. Necessary safety interlocks are provided to safeguard the high pressure pump & the RO membranes. Hydrocons offer manual & completely automatic reverse osmosis system to meet the customer requirement.

Hydrocons offer world’s latest electrodeionisation technology to generate high purity water. EDI cell can meet stringent water quality such as USP standards. The RO permeate water having conductivity less than 20 us/cm fed to EDI cell. The ion-exchange takes place on ultra pure resin bed. These absorbed ions of resins pulls towards concentrate chambers by respective electrode, these pulled ions continuously flush in concentrate chamber with small amount of RO permeate water & finally goes to drain.

RO System with can be designed for any feed water quality. RO System with max. overall recovery of 75-80% can be designed. The semi-permeable reverse osmosis membrane has a porosity 0.001 micron. Pressure sensors are provided across the RO system so as to measure feed & reject pressure of RO system. As soon as discharge pressure & pressure drop is more than 15 to 20% than normal then system will give alarm & if not attained within 5 min., the system will be tripped automatically. The Reverse Osmosis System consist of Hot water Sanitizable, high rejection & low energy type RO membranes. The RO membrane is housed in the High Pressure FRP/ SS 316/ SS 316 L. For high purity water the pipe end connections are with TC end connection.

Continuous Electro-Deionisation systems (CEDI) for producing pure water.

Introduction :

With the advent of new technology it is now practical to deionise water without the use of cation and anion resins regenerated with acid and caustic solutions; this technology is known as Continuous Electro-Deionisation or CEDI.

The process was developed in 1980 and has since been perfected in the form of modular cells for use in high purity water systems as a polishing de-ioniser when feed with permeate from a Reverse Osmosis system, thus replacing the requirement for twin bed and mixed bed de-ionisers.
Description of Continuous CEDI Cell:

CEDI systems are used as a post-treatment to reverse osmosis to further purify the permeate to produce water with a quality of 10 to 18 megohm depending on feed water quality and flow rates. The

CEDI units are modular in construction and can accommodate multiple CEDI modules.

Advantages of CEDI Cell over conventional EDI Systems

  • Does not require chemicals for regeneration
  • Compact in size
  • Produces consistent water quality
  • Economical running costs
  • Modular in construction
  • Safe process

Process Description :

CEDI system has an recovery of 95%. The 5% reject water from EDI can be feed back to the feed of RO System & hence the overall recovery of the system is 100% (approx.). CEDI consists of two chambers: the first is ion exchange chamber / frame consist of ultrapure cation & anion exchange resins, these resins are in mixed form. The second chamber is concentrate chamber. These chambers are arranged in alternate positions in EDI cell. The cation membrane & anion membrane forms the boundary of each ion exchange chamber. The cations present in the feed water are exchanged on cation exchange resins. These picked up cations push through resin towards the cathode & pass through the cation allowable membrane into the concentrate chamber. Also anions present in the feed water are exchanged on anion exchange resins. These picked up anions push through from resin towards the anode & pass through the anion allowable membrane into the concentrate chamber. All rejected ions in the concentrate chamber are continuously rinsed with a small amount of the RO Permeate water. This water having TDS not more than 25 – 30 ppm, can be recycle to the feed of Reverse Osmosis system. A part of permeate water when passes through the electric field of EDI cell, forms Hydrogen & Hydroxyl ions. These ions regenerate the cation & anion resins on-line.

A primary benefit of this system is continuous operation, as the ion exchange resin is regenerated continuously by electricity instead of regeneration chemicals. This approach eliminates the downtime, while reducing chemical usage and the need for waste treatment. No acid or caustic regenerate chemicals are required.

Hot water sanitizable EDI systems are also available for critical Pharma applications. Similarly EDI units with higher flow capacities and range are available for power plant applications.

The unit incorporates the following features:

  • Polished stainless steel housing and frame.
  • Integral control panel with auto dump feature.
  • Panel mounted resistivity meter with digital indication, temperature compensation and 0-10V output option.
  • Panel mounted pressure and flow metering for the system.
  • D.C. Voltage controller that can accept a 4-20mA control signal to control voltage in line with water quality.
  • The complete unit is fully assembled and ready for use simply by plumbing it directly on to the permeate water supply from a Reverse Osmosis system.
  • The complete system complies 21 CFR part 11 and backed with complete validation documents.
Drinking Water RO System
Drinking Water
RO System
RO-EDI System
RO-EDI System
Ultrafiltration System
Ultrafiltration System
Purified Water Storage & Distribution System
Purified Water Storage & Distribution System
Filtration System
Filtration System
Softening System
Softening System
Demineralisation System
Demineralisation System