Electrodeionization (EDI) Systems: Features and Considerations

EDI stands for electrodeionization system, a water treatment technology where ion exchange resins interconnect with an electric current to filter ions out of the water. They are commonly applied in pharmaceutical production, power stations, semiconductor processing, and more recently in the production of ultrapure water for numerous uses. Here, we delve into the features and considerations of EDI systems:

Features of Electrodeionization Systems:

Continuous Operation: EDI systems run continuously without the need for regeneration cycles as with integrated ion exchange systems. This results in increased efficiency and less time being lost.

Chemical-Free Operation: It is important to mention that unlike the chemical-based regeneration processes utilized in ion exchange, EDI is free of hazardous chemicals, thus lowering operational risks and environmental effects.

High Purity Water: Electrodeionization systems can operate at a high degree of purity, and water generated by them may have conductivities on the order of 0. At a resistivity of 1 µS/cm, it is ideal for ultra-pure applications such as semiconductor manufacturing, pharmaceutical production, and other uses where purity is paramount.

Cost Efficiency: Although EDI systems may have initial high capital costs, they can be less expensive in the long run than conventional ion exchange systems in terms of chemicals and labor.

Compact Design: EDI systems are commonly smaller than traditional ion exchange systems thus taking less space for installation and operation.

Automation and Control: The electrodeionization system of the current generation can be automated and controlled remotely, which makes them more flexible for data logging and integration into other water treatment systems.

Scalability: Hinada’s EDI systems are also portable in the sense that they can be sized proportionately to water demand in various industries thereby being flexible.

Environmental Benefits: EDI systems can be helpful to the sustainability goals since they do not require the use of chemicals for regeneration, do not produce much water waste, and help reduce risks associated with handling chemicals.

Considerations for Electrodeionization System Selection and Operation:

Feed Water Quality: It must be noted that feed water quality in the case of an EDI system is of great importance. Some pretreatment like filtration and reverse osmosis (RO) are required to eliminate particulates, organic matter, and any other particles which might foul or damage the EDI membranes.

System Design and Configuration: The EDI modules and how they are arranged as a system are crucial in setting the required standard of water quality and flow rates. Plasma current density, plasma flow distribution, and membrane stack configuration are some of the key considerations that need to be made.

Electrical Requirements: EDI systems are sensitive to electrical supply, and voltage, current, and frequency should be controlled to achieve the best results and not to shorten the useful life of the ion exchange membranes.

Monitoring and Maintenance: Some of the parameters that characterize the EDI system include water quality; flow rates, and electrical conductivity and all must be regularly checked. These may include cleaning, inspection and, even replacement as and when the membrane requires it.

Regulatory Compliance: The electrodeionization system may further require certain conformity to regulatory standards about water quality and purity, based on the industry and application of the system. Certification/ validation could be necessary depending on the industry usually in food processing industries and the pharmaceuticals.

System Integration: It may be required to install other advanced water treatment technologies including Reverse Osmosis, UV sterilization, and polishing filters to get the ideal quality of water for various purposes.

Operating Costs: EDI systems also provide a long-term return on investment, but the operators should also take into account energy and water consumption, membrane cost, and monitoring and maintenance charges while comparing the operating costs of the system.


Hinada’s electrodeionization systems are one of the developments in the water treatment industry and provide quality water without the drawbacks of a conventional ion exchange system. Since they do not use any chemicals the water produced is of high quality and standard and is suitable to be used in industries that require water of high standards and consistency. However, knowledge about feed water quality requirements, design, working parameters, and maintenance of the EDI system is crucial for the efficient use of the systems in the industries.

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