Electrodeionization (EDI)

  • Description

Electrodeionization (EDI) is a water treatment process that utilizes the principles of ion exchange and electrodialysis to remove dissolved ionic impurities from water. It is a highly efficient and continuous method for producing high-purity water with low levels of contaminants.

In an electrodeionization system, water flows between ion-selective membranes that separate it into two streams: a product stream and a concentrate stream. The membranes allow only specific ions to pass through, while blocking others.

The system consists of a series of alternating anion and cation exchange membranes, with ion exchange resin compartments located between them. These compartments contain ion exchange resins that attract and bind ions of the opposite charge as they pass through.

The process begins by applying an electric current across the ion exchange compartments. This electrical field causes ions to migrate towards the respective ion exchange resins, where they are captured and removed from the water. The captured ions are then washed away by the concentrate stream, while the purified water continues through the system as the product stream.

One of the significant advantages of electrodeionization is its continuous operation without the need for chemicals or periodic resin regeneration. This makes it a reliable and cost-effective method for producing high-quality water. Furthermore, it offers several benefits, including reduced chemical consumption, minimal waste generation, and lower operating costs compared to traditional ion exchange processes.

Electrodeionization finds applications in various industries, such as pharmaceutical manufacturing, power generation, semiconductor fabrication, and food and beverage production, where high-purity water is essential for processes or product quality. It is often used as a polishing step after other water treatment processes like reverse osmosis to further remove residual ions and achieve ultrapure water standards.

Overall, electrodeionization is a highly efficient and reliable water purification technology that combines ion exchange and electrodialysis principles to produce high-purity water with minimal operational requirements and costs.

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