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High-Purity EDI Water System - Advanced Technology from China Suppliers & Factory for Pure Water Treatment
Products Video
Products Description
EDI technology substitutes the traditional hybrid ion exchange demineralization process (DI) with an electroregenerative ion exchange demineralization process. High desalination efficiency is achieved through the combined action of ion exchange resin and selective ion membranes, complemented by reverse osmosis to produce water of ultra-high quality, reaching resistivity levels of 10~15MΩ·CM.
How EDI High-Purity Water Equipment Works
1. Electrodialysis
Under the influence of a direct current electric field, ions in water migrate toward oppositely charged electrodes and are separated by selective ion exchange membranes.
2. Ion Exchange
The EDI module is filled with ion exchange resin, which absorbs ions from water and further removes impurities.
3. Regeneration
The ion exchange resin within the EDI module undergoes continuous regeneration under the electric field, eliminating the need for chemical regenerants and enabling continuous operation.
Composition of EDI High-Purity Water Equipment
1. Pre-treatment System
Includes multi-media filters, activated carbon filters, softeners, etc., designed to remove suspended particles, organic matter, and hardness ions from water.
2. Reverse Osmosis System (RO)
Acts as pre-treatment for EDI, removing most ions and organic matter from water.
3. EDI Module
The core component that utilizes electrodialysis and ion exchange technology to remove trace ions from water.
4. Post-treatment System
Incorporates UV sterilizers and precision filters to ensure the final water quality meets stringent purity standards.
Conditions of Use
| Water Source | RO water production, conductivity 1-20μs/cm, maximum conductivity ≤30μs/cm (NaCl) |
| Inlet Hardness | < 1.0ppm (CaCO3) (recommended below 0.5ppm) |
| Total CO2 | < 3ppm |
| pH Value | 7.5-9 |
| Influent Organic Matter | TOC < 0.5ppm |
| Influent Oxidizer | Cl2 (active) < 0.03ppm, O3 (ozone) < 0.02ppm |
| Influent Heavy Metal Ions | Fe, Mn, variable valence metal ions < 0.01ppm |
| Inlet Silicon | SiO2 < 0.5ppm |
| Inlet Water Particle Size | < 1μm |
| Temperature | 15℃--35℃ |
| Inlet Pressure (DIN) | 0.15-0.4MPa |
| Concentrated Water Inlet Pressure (CIN) | 0.10-0.3MPa |
| Water Production Pressure (DOUT) | 0.05-0.25MPa |
| Concentrated Water Outlet Pressure (COUT) | 0.02-0.2MPa |
Application Fields
1. Electronics Industry
For the preparation of ultra-pure water in semiconductor and integrated circuit production processes.
2. Power Industry
Used for boiler feedwater, cooling water, and other applications.
3. Pharmaceutical Industry
For injection water, cleaning water, and similar uses.
4. Chemical Industry
For the production of high-purity chemicals.
The EDI device is typically placed after an electrodialyzer or reverse osmosis system (or directly applied to low-salt-content water), replacing ion exchangers to achieve further desalination and produce higher-purity water. It finds widespread application in electronics, chemicals, pharmaceuticals, atomic energy, and power industries.
Frequently Asked Questions
Q: What is the water resistivity level produced by EDI technology?
EDI technology, complemented by reverse osmosis, produces ultra-high quality water reaching resistivity levels of 10~15MΩ·CM.
Q: Does EDI high-purity water equipment require chemical regenerants?
No, the ion exchange resin within the EDI module undergoes continuous regeneration under an electric field, which eliminates the need for chemical regenerants and enables continuous operation.
Q: What is the recommended inlet water hardness for the EDI system?
The inlet hardness should be less than 1.0ppm (CaCO3), and it is recommended to keep it below 0.5ppm for optimal performance.
Q: What are the key components of the EDI equipment?
The system consists of a Pre-treatment System, a Reverse Osmosis System (RO), the core EDI Module, and a Post-treatment System (including UV sterilizers and precision filters).
Q: Which industries benefit most from EDI technology?
It is widely used in the electronics industry (semiconductors), power industry (boiler feedwater), pharmaceutical industry (injection water), and chemical industry for high-purity chemical production.