The Ultrapure Reverse Osmosis (RO) and Electrodeionization (EDI) System combines primary single-pass or double-pass membrane desalination with continuous electrochemical deionization. This integrated solution provides high-resistivity process water for demanding industrial applications, complying with international quality standards such as USP/EP Purified Water guidelines and ASTM Type I/II specifications.

Key Technical Parameters & Selection Basis

System configuration is calculated from feed-water chemistry, required flow rate, peak demand, and site sanitization protocols.

Parameter	Selection & Engineering Basis	Technical Specification Range
System Capacity	Continuous demand and peak flow allowance	0.5 m³/h to 100+ m³/h (Customizable)
Feed-Water Source	Municipal supply, well water, or pre-conditioned feed	Requires basic municipal or softened supply
Feed-Water Quality	Based on raw water analysis report	TDS, Hardness, CO2, Silica, TOC, Turbidity
RO Permeate Quality	Engineered to meet exact EDI module inlet limits	Conductivity < 20 µS/cm, Free Chlorine < 0.05 ppm
Product Water Quality	Application-specific resistivity/conductivity targets	Conductivity < 0.1 µS/cm
Recovery Rate	Feed salinity and antiscalant design dependent	75% - 85% total system recovery
Operating Temperature	Membrane and EDI stack thermal limits	5°C to 35°C (Option for hot-water sanitizable)
Construction Standards	GMP, ASME BPE, Sanitary piping design	Sanitary SS316L (Orbital Welded), PVDF, or CPVC
Control Architecture	Automation level and audit trail compliance	PLC (Siemens/Allen-Bradley) with Touchscreen HMI

Integrated Treatment Stage Breakdown

Treatment Stage	Core Function	Key Contaminants Removed / Managed
1. Pretreatment	Protects downstream RO membranes and EDI stacks	Suspended solids, chlorine, hardness scaling, organics
2. Reverse Osmosis (RO)	Primary desalination stage generating EDI feed water	Dissolved salts (99%+), TDS, bacteria, silica, TOC
3. EDI Polishing	Electrochemical deionization without chemical regeneration	Trace ions, residual silica, carbon dioxide

RO Only vs. RO + EDI System Comparison

Feature / Metric	RO System Only	Integrated RO + EDI System
Final Water Quality	Moderate purity (1 - 10 µS/cm)	Ultrapure (0.055 - 0.1 µS/cm / Up to 18.2 Mohm·cm)
Chemical Regeneration	Not required (Periodic CIP needed)	None required for EDI (Continuous electrical operation)
Effluent Stability	Varies with raw water temperature/TDS	Highly stable and continuous ionic purity
Capital & Operating Cost	Lower CAPEX, higher downstream exchange OPEX	Higher initial CAPEX, lower long-term operating OPEX
Target Application	General process water, boiler feed	Pharma, Semiconductor, Biotech, Medical Devices

Industry Applications & Project Benchmarks

Pharmaceutical & Biotech: Pretreatment for Water for Injection (WFI) loops and USP/EP Purified Water systems.

Electronics & Semiconductor: Microchip rinsing, wafer fabrication, and precision electronic component manufacturing requiring up to 18.2 Mohm·cm water.

Medical Device Manufacturing: Cleanroom component cleaning and medical device washing compliant with ISO 13485 requirements.

Power & General Industry: High-pressure boiler feed water, turbine cooling loops, and high-purity chemical processing.

Quality Assurance & Factory Acceptance Testing

Component Inspection: Verification of ASME-certified vessels, sanitary pumps, and genuine membrane/EDI modules.

Mechanical & Piping Check: Hydrostatic pressure testing at 1.5x design pressure; boroscope weld inspection reports provided upon request.

Electrical & Automation Test: Point-to-point wiring validation, PLC logic verification, and alarm interlock simulation.

Pre-Shipment Wet Testing: Full operational testing to verify flow balance, pressure drops, and instrument calibration.

FAQ

Q: Does EDI completely replace Reverse Osmosis (RO)?

A: No. EDI acts as an ionic polishing stage and requires RO permeate as its feed water. RO removes the vast majority of dissolved solids, organic compounds, and particulates, ensuring the feed water meets the stringent inlet requirements of the EDI module.

Q: Why does EDI not require chemical regeneration?

A: EDI combines ion-exchange resins, selective membranes, and a direct electric current. The electric field continuously drives impurity ions through the membranes while simultaneously splitting water molecules into hydrogen (H+) and hydroxyl (OH-) ions, continuously regenerating the resin in real time without chemicals.

Q: What feed-water parameters are most critical for EDI performance?

A: The most critical feed parameters for EDI include hardness (must be < 1.0 ppm as CaCO3), total silica (< 0.5 ppm), carbon dioxide CO2 (< 5 ppm), total organic carbon TOC (< 0.5 ppm), and free chlorine (< 0.05 ppm). High levels of hardness or CO2 will cause scaling or overload the EDI stack.

Q: What documentation is supplied with the system for validation?

A: Standard engineering documentation packages include the Process Flow Diagram (PFD), Piping & Instrumentation Diagram (P&ID), General Arrangement Drawing, Electrical Schematics, Control Philosophy, Instrument List, Factory Acceptance Test (FAT) Protocol, Operation & Maintenance Manuals, and material certificates (e.g., 3.1 material traceability).

Q: Can an RO-EDI system be integrated into an existing water treatment facility?

A: Yes. The system can be designed as a skid-mounted package ready to integrate with your existing pre-treatment, raw water supply, storage tanks, and distribution loops. Our engineering team evaluates your current feed water quality and space availability to customize the interface.

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