Ensuring Superior Water Purity with EDI Ultrapure Water Equipment

Ensuring Superior Water Purity with EDI Ultrapure Water Equipment

Introduction
Electrodeionization (EDI) represents a continuous, chemical-free method for producing ultrapure water by coupling ion-exchange resins with electrically driven ion migration. At Hebei Huayu Environmental Engineering Co., Ltd, our EDI Ultrapure Water Equipment delivers reliable removal of ionic contaminants—such as sodium, calcium, chloride, and silica—to achieve resistivity levels above 16 MΩ·cm and total organic carbon (TOC) below 5 ppb. Designed for semiconductor fabrication, pharmaceutical production, and analytical laboratories, our EDI systems ensure stable water quality without the need for regenerant chemicals.

System Configuration and Process Flow

1. Upstream Pretreatment

• Reverse Osmosis Stage: Lowers feed conductivity to below 50 µS/cm and reduces particulate and organic fouling potential.

• Mixed-Bed Polishing (Optional): Further reduces ion load to optimize EDI performance and extend module life.

2. EDI Stack Assembly

• Ion-Exchange Membrane Modules: Alternating cation and anion-selective membranes form compartments containing mixed-bed resin particles.

• Electrodes and Power Supply: Direct-current source applies an electric field (10–30 V per cell pair) to drive ions from the diluting compartments into adjacent concentrate compartments.

• Continuous Regeneration: As ions migrate under electric potential, the resin is constantly regenerated in situ, maintaining ion-exchange capacity without chemical input.

3. Permeate Polishing

• TOC Removal (optional): Ultraviolet oxidation modules lower organic content to meet stringent purity targets.

• Final Filtration: 0.1 µm cartridge filters safeguard downstream systems from any particulate carryover.

4. Monitoring and Control

• Conductivity and Resistivity Sensors: Inline measurement at inlet, outlet, and recycle streams for continuous quality assurance.

• Automatic Acid/Base Dosing: pH control for optimized resin performance and prevention of silica scaling.

• Remote Diagnostics: SCADA integration provides real-time data logging, alarm notifications, and trend analysis.

Key Technical Features

• Modular Skid Design: Scalable EDI stacks allow capacity expansion from 1 m³/h up to 50 m³/h by adding parallel modules.

• Energy Efficiency: Low-voltage operation and recovery of concentrate streams reduce power consumption compared to traditional deionization.

• Non-Chemical Operation: Eliminates handling and disposal of caustic or acid regenerants, enhancing safety and reducing environmental impact.

• High Ion-Removal Consistency: Stable resistivity output with minimal fluctuation, even under varying feed conditions.

Operational Benefits

1. Continuous Ultrapure Water Production
   EDI provides steady-state operation without batch regeneration, supporting uninterrupted manufacturing processes and analytical assays.

2. Reduced Operating Costs
   Savings on regenerant chemicals and waste disposal translate into lower total cost of ownership over the system lifecycle.

3. Compact Footprint
   High ion-removal capacity per module allows installation in limited-space mechanical rooms or cleanroom environments.

4. Enhanced Safety and Compliance
   Absence of chemical storage and handling minimizes occupational hazards and eases adherence to environmental regulations.

Applications

• Semiconductor Industry: Feed water for ion implanters, wet benches, and final rinse baths requiring resistivity >15 MΩ·cm.

• Pharmaceutical Manufacturing: Water for injection (WFI) pre-treatment and formulation processes demanding low endotoxin and TOC levels.

• Power Generation: Boiler make-up water polishing to prevent corrosion and fouling in high-pressure turbines.

• Laboratory and Analytical: Preparation of standards and mobile phase water for high-performance liquid chromatography (HPLC).

Maintenance and Service Support
Hebei Huayu provides:

• Preventive Maintenance Plans: Scheduled inspections of membrane integrity, stack performance, and sensor calibration.

• Spare Parts Kits: Replacement ion-exchange membranes, resin packets, and electrode assemblies for rapid on-site servicing.

• Operator Training: Practical instruction on routine checks, stack flushing protocols, and troubleshooting.

Conclusion
Hebei Huayu Environmental Engineering Co., Ltd’s EDI Ultrapure Water Equipment offers a continuous, chemical-free solution for generating ultrapure water. With modular design, automated controls, and comprehensive support, our systems help clients in high-purity industries maintain consistent water quality, reduce operating expenses, and enhance process reliability.