Working principle
Ion exchange: The EDI module is filled with anion and cation exchange resin. When raw water passes through, the anions and cations in the water will exchange with the exchangeable ions on the resin, thereby being removed. For example, sodium ions in water will exchange with hydrogen ions on cation exchange resin, and chloride ions will exchange with hydroxide ions on anion exchange resin, resulting in initial desalination of water.
Ion migration: Under the action of a direct current electric field, ions exchanged onto the resin will migrate towards the corresponding electrode direction. Cations move towards the cathode and enter the concentrated water chamber through the cation exchange membrane; Anions move towards the anode and enter the concentrated water chamber through the anion exchange membrane. In this way, ions in the freshwater chamber are continuously migrated out, thereby achieving deep desalination of water.
Electrolysis of water: Near the electrode, hydrogen ions and hydroxide ions generated by water ionization are continuously replenished into the ion exchange resin, enabling continuous regeneration of the resin without the need for regular chemical regeneration like traditional ion exchange resins.
Important role in water treatment
Improving water quality: It can effectively remove various salts and ions from water, achieving a water resistance rate of 15-18.2 M Ω· cm, meeting the production needs of high-purity water, such as ultrapure water used in the electronics industry for manufacturing semiconductor chips.
Continuous and stable operation: It can achieve continuous water production without the need for frequent regeneration operations like traditional ion exchange equipment, ensuring the stability and continuity of water supply and improving production efficiency.
Environmental protection and energy conservation: Compared with traditional ion exchange resin regeneration processes, EDI technology does not require the use of large amounts of acidic and alkaline chemical agents for regeneration, reducing the discharge of chemical wastewater, lowering environmental pollution, and also saving energy consumption during acidic and alkaline storage and transportation processes.
Applicable scenarios
Electronics industry: Used for producing ultrapure water required for electronic components such as semiconductors, integrated circuits, and liquid crystal displays to prevent trace impurities in water from contaminating and damaging electronic components.
Pharmaceutical industry: The preparation of injection water and purified water that meets the requirements of Good Manufacturing Practice (GMP) ensures the stability and safety of drug quality.
Power industry: used for boiler feedwater treatment in power plants to prevent boiler scaling and corrosion, improve boiler thermal efficiency and operational safety.
The chemical industry, such as fine chemicals and cosmetics production, requires high-purity water as raw material or solvent. EDI technology can provide high-quality water sources that meet the requirements.
Post time: Apr-21-2025