When industrial processes require absolute ionic purity—such as in microchip fabrication, photovoltaic cell manufacturing, and pharmaceutical injectables—standard Reverse Osmosis is insufficient. Xintai Environmental Protection installs and commissions premium Electrodeionization (EDI) Systems designed to polish RO permeate into true ultrapure water.
Unlike traditional mixed-bed ion exchange resins that require hazardous acid and alkali chemicals for regeneration, our EDI systems use continuous electrical current to regenerate the resins internally. This results in zero chemical handling, zero hazardous waste discharge, and a perfectly stable stream of water reaching up to 18.2 MΩ.cm resistivity.
Typical Treatment Process Flow
Raw Water → Multi-Media Pretreatment → Double-Pass Reverse Osmosis (RO) System → Intermediate Pure Water Tank → UV Sterilization → EDI (Electrodeionization) Module Array → Microfiltration (0.2μm) → Ultrapure Water Point-of-Use
Note: For critical pharmaceutical applications, the entire post-EDI looping system is constructed using sanitary 316L stainless steel with orbital welding, completely eliminating dead legs where bacteria could harbor.
Core System Features
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Chemical-Free Regeneration
Electrolysis continuous regeneration eliminates the need for storing, handling, and neutralizing dangerous acid/base chemicals on site. -
Unwavering High Purity
Provides a perfectly stable baseline of ultrapure water (15-18.2 MΩ.cm) without the sudden quality drops associated with depleted traditional resins. -
Compact & Modular
EDI stacks take up less than half the floor space of equivalent massive mixed-bed resin tanks, allowing easy capacity expansion. -
Fully Automated Operations
Integrated with high-precision resistivity digital meters, automatically shifting flows to drain if parameters deviate from the strict setpoints.
Application Fields
EDI systems represent the state-of-the-art required for industries such as:
- Semiconductors & Microelectronics: Silicon wafer washing and PCB sub-component manufacturing.
- Pharmaceutical & Medical: Preparation of WFI (Water for Injection) and lab-grade analytical reagents.
- Power & Energy: High-pressure boiler feedwater for thermal power stations and nuclear plants.
- Fine Chemicals: Synthesis of high-purity chemical compounds and cosmetics.