Overview
EDI ultrapure water equipment is crucial in industries demanding ultra-pure water. Through the synergistic effect of electric field and ion exchange resins, it removes most ionic impurities, producing water with a resistivity of up to 18.2 MΩ·cm (25°C). It's vital for semiconductor, biotech, and electronics sectors.
The core principle is using an electric field to make ions migrate through membranes while resins are continuously regenerated, ensuring stable ultrapure water production. Compared to traditional methods, it cuts chemical use by over 90% and reduces the footprint by about 50%, thus being the preferred choice for high-quality water production.
Core Working Principle and Structural Design
I. Electrodeionization Process
1. Ion Migration: In the EDI module under an electric field, cations like Na⁺ move to the cathode through the cation exchange membrane, and anions like Cl⁻ move to the anode through the anion exchange membrane. Water molecules form ultrapure water as they pass through.
2. Resin Regeneration: Ion exchange resins absorb and exchange ions. With the electric field, H⁺ and OH⁻ from water ionization regenerate the resins in situ, maintaining their function.
II. Structural Features
1. Modular Design: Comprising multiple modules in series or parallel, it can be customized based on water production needs. Each module's capacity varies, facilitating installation and expansion.
2. Quality Materials: Made of 316L stainless steel or good plastics, key components use high-performance materials for stable operation under different conditions (pH 2 - 12, pressure 0.2 - 0.6 MPa) with a long service life.
3. Intelligent Monitoring: Equipped with sensors and a PLC system, it monitors water quality, pressure, and flow in real time. It alarms and takes measures when abnormal, enabling automated operation.
Application Scenarios
1. Semiconductor Manufacturing: Needed for wafer cleaning, lithography, etc. It provides water with low impurities and high resistivity, improving chip quality and yield.
2. Biotechnology: For cell culture and drug preparation, its ultrapure water meets strict standards, ensuring product safety and effectiveness.
3. Power Electronics: Used in cooling systems and component production, it prevents scale formation and extends equipment life.
Technical Advantages and Industry Value
1. High-Quality and Stable Water: It consistently produces high-quality water with little quality fluctuation, meeting or exceeding standards, supporting quality-sensitive processes.
2. Environment and Cost Benefits: Reducing chemical use and waste, it's eco-friendly. Low operation and maintenance costs and long lifespan save costs for enterprises.
3. Adaptability: It starts quickly and runs stably, can be customized for different applications, adapting well to various industries.
Selection and Maintenance Guidelines
I. Selection Factors
- Capacity Matching: Choose equipment based on 1.2 times the maximum water usage to ensure enough supply.
- Inlet Water Quality: Pretreat inlet water to meet hardness, turbidity, etc. requirements, like keeping hardness below 1 ppm.
- Standard Adaptation: Select according to industry-specific standards to ensure water quality fits the application.
II. Maintenance Strategies
1. Daily Inspection: Check equipment daily for normal operation and leakage. Sample and test water quality weekly.
2. Regular Maintenance: Clean the equipment quarterly and check component connections. Test key parts annually and replace or repair as needed.
Industry Trends
EDI equipment is evolving towards higher precision, intelligence, and energy efficiency. New materials and technologies will enhance purification, while big data and AI will optimize operation and reduce failures. Energy recovery devices will cut energy consumption for green development.
Conclusion
EDI ultrapure water equipment is essential in high-end fields. Its excellent performance meets the demand for high-quality water in various industries. Future developments will make it play a more important role in promoting industry progress.
