EDI Ultrapure Water Equipment

EDI Ultrapure Water Equipment: Continuous Chemical‑Free Production of High‑Purity Water

Introduction
Electrodeionization (EDI) technology represents a significant advancement in producing ultrapure water without chemical regenerants. Hebei Huayu Environmental Engineering Co., Ltd. offers EDI Ultrapure Water Equipment that integrates ion‑exchange membranes and electrically active resins in a single modular unit. This approach not only streamlines the purification process but also reduces operating costs and environmental impact.

Principles and Components
An EDI system typically follows an upstream reverse osmosis (RO) stage to remove the bulk of dissolved solids. The RO permeate then enters the EDI modules, where an electric field continuously drives ion migration through selective membranes. Key components include:

• EDI Modules: Stacks of alternating ion‑selective membranes and resin chambers.

• Power Supply and Control Cabinet: Maintains constant voltage/current for ion migration, monitored by PLC.

• Instrumentation: Conductivity sensors, flow meters, and pressure gauges ensure real‑time quality control.

• Recirculation Loop: Optimizes contact time and prevents channeling within the resin beds.

Operational Workflow

1. Feedwater Conditioning: Pre‑treated RO permeate reaches the specified conductivity range.

2. Continuous Ion Removal: Under an applied electric field, cations and anions migrate out of the product stream into concentrate channels.

3. Regeneration in situ: The electric field regenerates the resin continuously, eliminating the need for acid or caustic chemicals.

4. Product Monitoring: High‑accuracy conductivity meters verify ultrapure water quality (up to 18.2 MΩ·cm).

Applications

• Pharmaceutical Production: WFI (Water for Injection) feed polishing.

• Microelectronics: Final rinse water to prevent ionic contamination on wafers.

• Laboratory Analysis: High‑precision instruments requiring stable, low‑ion water.

• Power Generation: Boiler feedwater polishing to prevent scaling and corrosion.

Advantages

• Chemical‑Free Operation: Eliminates handling and disposal of regenerant chemicals.

• Reduced Footprint: Compact modules integrate easily into existing RO skid layouts.

• Lower Total Cost of Ownership: Continuous regeneration reduces downtime and supply logistics.

• Consistent Quality: Automated controls maintain stable resistivity over extended periods.

Conclusion
Hebei Huayu’s EDI Ultrapure Water Equipment delivers a sustainable solution for industries demanding ultrapure water. By combining RO pretreatment with EDI modules, the system ensures a reliable, low‑maintenance operation suitable for continuous production environments.