Electric demineralization Systems (EDI)

The EDI system is an abbreviation of the English word  “electrodeionization”. Nowadays EDI technology has become popular in the water purification industry. The process of installing an EDI system is commonly used after reverse osmosis (RO) to polish RO treatment water to remove minerals to obtain water with low conductivity and silica content. EDI uses a combination of semi-permeable membranes, ion-exchange resins, and direct electric fields to produce high-quality ultrapure water. Ion exchange resins are regenerated continuously without stopping the machine and without the use of cleaning chemicals. Therefore, EDI technology is evaluate as an alternative to conventional deionization methods.

EDI technology is an excellent alternative to conventional deionization systems. It can continuously produce water with stable resistivity 18 MΩ*CM.

Typical applications of water EDI filtration systems are boiler feed water at thermal and power plants, water treatment in the electronics industry, pharmaceutical industry, hospitals and laboratories.

Electrodeionization (EDI) systems

High-performance water filtration system no chemicals.

Electrodeionization is a water treatment process that uses a combination of ion-exchange resins, ion-exchange membranes, and direct current to continuously deionize water without the need for chemicals.
It is a self-regenerating technology that provides a consistent flow of high-quality deionized water. The elimination of regeneration chemicals reduces operating cost and avoids the liability and cost of waste neutralization and handling of hazardous chemicals.
Production of pure water has evolved from conventional pretreatment with multiple stages of ion exchange in initial and final demineralization to the following membrane based operations, including EDI, that are now considered to be best practice by many customers around the world:

EDI utilizes both traditional ion exchange resin and ion exchange membrane to remove contaminants, including those that are uncharged or lightly charged in the feed water such as silica and boron. The biggest advantage lies in the fact that EDI technology employs direct current to drive contaminants out of the feed water and through the ion exchange membranes into the concentrate channels. The direct current also splits water into hydrogen and hydroxyl ions which act as continuous regenerating agents so that contaminants do not accumulate on the ion exchange resin. Therefore, EDI can continuously produce high-purity and ultrapure water. Typically >17 MΩ-cm product water; >99% Sodium and >95% Silica removal.

EDI’s High Purity Electrodeionization systems are used for a wide variety of applications including critical boiler make-up, microelectronics, and critical purity manufacturing. These systems are available in a range of capacities and can be furnished as containerized or skid-mounted systems.

• Utilizes robust, leak free EDI component designs that are modular and scalable
• Continuous High Purity Water production
• Simple operation and option equipped with automatic monitoring and voltage control system
• ​HMI - MODBUS – DCS direct connections available
• Resin filled concentrate and dilute chambers for highest production quality at lowest power cost
• ​Corrosion-proof wetted components
• ​Alternative module options designed for greywater, high hardness, and elevated silica applications

Design & Build

Anthy selects technology that optimizes equipment combinations to industry specifications to ensure customized demineralization (EDI) systems that meet both system specifications and customer needs. 

DI System 20m3/hr

20m3/hr EDI system

1. Location: Seoul Semiconductor Vina
2. Include 4 modules EDI 5Ton
3. Engineered modern, smart
4. High technology 
5. Control by PLC
6. Fully automatic monitoring
7. Can double capacity easily
8. High performance

12m³/hr EDI system

1. Location: Vitalink Vietnam Copany
2. Include 4 modules EDI 
3. Installed on a frame separate 
4. Engineered modern, smart
5. Economical
6. Quick capital recovery

6m³/hr EDI system

1. Location: Namuga 
2. Include 2 modules EDI 3Ton
3. Engineered modern, smart
4. Economical
5. Engineered modern, smart
6. Mounting on the frame with RO

2m³/hr EDI system

1. Location: Hyundai Kefico Vina
2. Include module EDI 3ton
3. Installed on a frame separate 
4. Long life service
5. Quick capital recovery
6. High shelf life

1. Client: Chemilens Viet Nam JSC
2. Modules EDI 2.5 m3/h
3. Mixed bed Polisher
4. Smart modern design
5. Cost saving, long life
6. Control system by PLC
7. Automatic monitoring system
8. Excellent system performance

5m³/hr EDI system

1. Location: Bac Ninh Province
2. Include module EDI 5ton
3. Installed on a frame separate 
4. Economical
5. High shelf life
6. Aesthetics & rugged design

3m³/hr EDI system

1. Location: Vina DEF
2. Include module EDI 3ton
3. Installed on a frame separate 
4. Economical
5. Quick capital recovery
6. High shelf life