Water purification is a very vital process in several industries such as pharmaceuticals industries, power industries among others. But, as one industry advances, so does the demand for improved, eco-friendly, and inexpensive techniques in the purification of water. One of the more innovative technologies that have become rather popular in recent years is electrodeionization.

What is Edi Electrodeionization?

Electrodeionization (EDI) is a water treatment process that combines two established technologies: Among them, the most used technologies are ion exchange and electrodialysis. It is extensively used for producing highly demineralized water by rejecting ionized and ionizable materials using electrically charged media and ion-exchange membranes.

How Does Edi electrodeionization Work?

The EDI process involves several key components:

Ion-Exchange Resins: These are very fine pellets used to remove ions from water as it passes through the tank.

Ion-Exchange Membranes: These can only allow either positive charges or negative charges in the form of ions to pass through.

Electric Field: An electric current is used to activate the movement of the ions through the membranes and resins.

It is a system of compartments containing ion exchange resins separated by anion and cation exchange membranes through which water flows. In the presence of an electric field, the water gets charged and ions migrate to the respective electrodes with opposite charges. These ions are then led through the ion-exchange membranes which in essence filter them out with the water.

Advantages of Edi electrodeionization

Continuous Operation: EDI is more efficient than the ion exchange systems that require frequent chemical regeneration; instead, it has Regeneration: Electrical and operates on a continuing process.

High Water Quality: EDI results in high water purity with a resistivity that could be as high as 18. 2 megohm-cm, which is useful for industries involving the use of high-purity water.

Cost-Effective: Though it might initially cost more to install direct ventilation systems compared to less efficient indirect ones, operation costs are lower because of the absence of chemical regenerants and less labor.

Environmentally Friendly: EDI is an environmentally friendly technology since it has low consumption of chemicals and it also does not cause harm to the environment like the ion-exchange regeneration process.

Applications of Edi electrodeionization

Hinada’s EDI is used in various high-purity water applications, including:

Pharmaceutical Industry: In cases manufacturing water for injection and other processes that may be required in the production of pharmaceutical products.

Power Generation: To remove hardness and prevent scaling and corrosion in the turbines and boilers, to generate the boiler feed water.

Microelectronics: Especially in industries such as semiconductor manufacturing where water is used in production to prevent contamination.

Laboratories: Specifically, the demineralized water system is used for generating reagent-grade water necessary for scientific use.

Challenges and Future Directions of Edi Electrodeionization

While EDI is highly efficient, it does have some limitations:

Initial Cost: One of the drawbacks of EDI systems is that it has comparatively high setup costs compared with other interfaces.

Complexity: Edi electrodeionization systems are more complicated than traditional systems in their design and execution, for which human resources are necessary for personnel with specific qualifications.

Fouling: The ion-exchange membranes and resins may contain fouling agents that may decrease efficiency and may need to be cleaned.

EDI technologies are expected to advance and meet the following obstacles with increased effectiveness in using cheap materials and better system designs and operational effectiveness. There are also efforts being made to increase the versatility of EDI to be used in treating several types of water sources, particularly those with high loads of organic and particulate matter.

Broader Applications 

  1. Food and Beverage Industry

Demineralized water is used in the formulation of food and beverages and for cleaning purposes hence the use of EDI in the food and beverage sector. High-purity water is useful in maintaining the quality of the products, especially because of the high requirements set by health departments around the world.

  1. Biotechnology and Life Sciences

EDI meets the high-purity water required for several biotechnological processes such as cell culturing, DNA replication, and enzyme manufacturing. These high purity levels help counter contamination and provide accuracy in measurements and results attained experimentally.

  1. Desalination

Although EDI is applied predominantly for the re-treatment of water that has already undergone treatment, the technology is slowly finding applications in desalination. EDI can also be employed in desalination plants after reverse osmosis to filter out the remaining ions for better efficiency of the plants.

  1. Metal Finishing

In some industries like electroplating and surface finishing, edi electrodeionization is applied to generate deionized water for use in rinsing and washing. This aids in achieving high-quality finishes and eliminates defects arising from the presence of impurities.


Hinada’s Edi electrodeionization is a breakthrough innovation in the water purification industry since it is environmentally friendly, safe, very efficient, and yields high-purity water needed for certain industries. Even with time going forward, EDI stands to be even more significant to the water treatment needs of industries, especially regarding purity, the environment, and financial impacts.

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