0102030405
High-Purity EDI Water Systems: Leading China Suppliers and Factory for Advanced Water Treatment Solutions
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
| Parameter / Condition | Requirement Specifications |
|---|---|
| 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 (FAQ)
What is EDI technology and how does it compare to traditional DI?
EDI (Electrodeionization) technology substitutes the traditional hybrid ion exchange demineralization process (DI) with an electroregenerative ion exchange demineralization process. It combines selective ion membranes and ion exchange resin with a DC electric field to continuously produce ultra-high quality water (10~15MΩ·CM) without requiring chemical regenerants.
How does the continuous regeneration process in EDI work?
Under the influence of the direct current electric field, water molecules are split into hydrogen (H+) and hydroxyl (OH-) ions, which continuously regenerate the ion exchange resin in-situ. This eliminates the need for shutdown and chemical regeneration, allowing for continuous, uninterrupted operation.
What are the primary systems that compose EDI High-Purity Water Equipment?
The equipment typically consists of four main systems: a Pre-treatment System (filters and softeners), a Reverse Osmosis (RO) System (which serves as the initial desalination stage), the core EDI Module (for deep demineralization), and a Post-treatment System (incorporating UV sterilizers and precision filters for final purity).
What feed water quality is required for optimal operation of the EDI module?
The feed water (typically RO product water) should have a conductivity of 1-20μs/cm (maximum ≤30μs/cm), hardness < 1.0ppm (recommended < 0.5ppm), total CO2 < 3ppm, TOC < 0.5ppm, and temperature between 15°C and 35°C, along with strict limits on heavy metals and oxidizers.
In which industries is EDI high-purity water most commonly used?
EDI high-purity water systems are widely applied in the electronics industry (semiconductors and integrated circuits), power industry (boiler feedwater), pharmaceutical industry (injection and cleaning water), and chemical industry (high-purity chemical production).