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EDI (Electrodeionization) ultrapure water equipment is vital in modern high-tech industries. Through the synergistic action of electrodeionization technology and ion exchange resins, it efficiently removes nearly all ionic impurities in water, producing ultrapure water with a resistivity up to 18.2 MΩ·cm (at 25°C). It's crucial for semiconductor, biomedicine, and power electronics industries with high water quality demands. Its core is using an electric field to drive ion migration through ion exchange membranes and enabling resin regeneration simultaneously, ensuring stable ultrapure water production. Compared to traditional processes, it reduces chemical agent use by over 90% and floor area by about 50%, becoming the mainstream choice for high-quality ultrapure water production.
Working Principle and Structural Design
I. Principle of Electrodeionization
1. Ion Migration: In the EDI module with a DC electric field, cations like Na⁺ move towards the cathode and pass through the cation exchange membrane into the concentrate chamber, while anions like Cl⁻ move towards the anode and through the anion exchange membrane into the same. Water molecules, being uncharged, form ultrapure water in the product water chamber.
2. Resin Regeneration: Ion exchange resins adsorb and exchange ions. Under the electric field, H⁺ and OH⁻ from water ionization regenerate the resins in situ, maintaining their ion exchange ability and the system's efficient operation.
II. Structural Design Advantages
1. Modular Design: Comprising multiple EDI modules connected in series or parallel, it can be configured flexibly according to different water production needs, with single-module capacities ranging from a few to dozens of cubic meters per hour, facilitating installation, maintenance, and expansion.
2. Quality Materials: The equipment body is made of corrosion-resistant 316L stainless steel or good engineering plastics. Key parts like ion exchange membranes and electrodes use high-performance, long-life materials, enabling stable operation under various conditions (pH 2 - 12, pressure 0.2 - 0.6 MPa) with a service life over 10 years.
3. Intelligent Monitoring: Equipped with sensors and a PLC control system, it monitors influent and product water quality, pressure, and flow in real time. It alarms and takes protective measures in case of abnormalities, achieving automated operation.
plication Scenarios
1. Semiconductor Manufacturing: In chip production, large amounts of ultrapure water are needed for processes like wafer cleaning. EDI equipment provides high-purity water with low particulate and high resistivity, improving chip quality and yield.
2. Biomedicine: For cell culture, drug preparation, etc., the ultrapure water from EDI equipment meets strict standards of being free from pyrogens and endotoxins, ensuring product safety and effectiveness.
3. Power Electronics: In cooling systems and component production, the ultrapure water prevents scale formation, reduces conductivity, and extends equipment life, ensuring system stability.
echnical Advantages and Industry Value
1. Quality and Stability: It steadily produces high-quality ultrapure water with minimal quality fluctuations, meeting or exceeding international standards, ensuring reliable water supply for quality-sensitive activities.
2. Environment and Cost: Reducing chemical agent use and waste discharge, it's environmentally friendly. Its low operation and maintenance costs and long lifespan save enterprises significant costs in the long term.
3. Efficiency and Adaptability: It starts quickly and runs stably, can be customized according to users' needs, adapting to diverse industrial applications.
election and Maintenance Guidelines
I. Selection Factors
Capacity Matching: Choose equipment based on 1.2 times the maximum water usage to ensure sufficient supply.
Influent Quality: Pretreat influent to meet hardness, turbidity, and organic matter requirements. For example, control hardness below 1 ppm for proper operation.
Standard Adaptation: Select equipment according to specific industry standards to ensure water quality compliance.
II. Maintenance Strategies
1. Daily Inspection: Check equipment status daily, including instrument display and leakage. Regularly sample and test water quality weekly.
2. Regular Maintenance: Clean the equipment quarterly, check component connections. Test key parts annually and replace or repair as needed.
industry Trends
EDI equipment is developing towards higher precision, intelligence, and energy efficiency. New materials and technologies will improve desalination and purity. Big data and AI will optimize operation and reduce failures. Energy recovery devices will cut energy consumption, promoting green development.
conclusion
EDI ultrapure water equipment is indispensable in high-end fields. With its excellent performance, it meets the urgent need for high-quality water in various industries. Future technological advancements will enhance its role in promoting industry quality development.
