RO EDI Plant

What is RO EDI Plant? Definition & Core Technology

The RO EDI Plant combines Reverse Osmosis (RO) and Electrodeionization (EDI) technologies to produce ultra-pure water for industries such as electronics, pharmaceuticals, semiconductors, and laboratories.

• RO (Reverse Osmosis): Removes up to 99% of dissolved salts, organic matter, and particulates using 0.0001 μm RO membranes.
• EDI (Electrodeionization): Uses electric current and ion-exchange resins to continuously remove remaining ions, achieving resistivity up to 18.2 MΩ·cm-without acid or caustic regeneration.
• RO + EDI Integration: The RO stage reduces TDS to <50 ppm, while EDI polishes the permeate to ultrapure standards, delivering continuous high-quality water.

👉 Learn more: What is EDI and How It Works →

How Does the RO EDI Plant Work? (5-Step Process)

Step 1: Raw Water Pretreatment

Removes suspended solids and chlorine to protect RO membranes. (SDI < 5, Free Chlorine < 0.1 ppm)

Step 2: Reverse Osmosis (RO)

High-pressure filtration removes 99% of TDS. Recovery rate: 75–85%.

Step 3: Feed Adjustment for EDI

RO permeate is balanced at pH 6.5–8.0 and 25–35°C for stable EDI operation.

Step 4: Electrodeionization (EDI)

Electric fields and resins remove cations/anions, achieving resistivity >15–18 MΩ·cm.

Step 5: Post-Treatment & Storage

Water passes through UV sterilization before being stored in sanitized stainless-steel tanks.

Technical Specifications

7 Key Advantages of RO EDI System

1️⃣ Ultra-Pure Output - Produces water with resistivity ≥18.2 MΩ·cm, meeting ASTM Type I standards.
2️⃣ No Chemical Regeneration - Uses electricity instead of acid/alkali, cutting chemical usage by 95%.
3️⃣ Continuous, Uninterrupted Operation - No downtime for regeneration or resin replacement.
4️⃣ Compact Footprint - Integrated RO+EDI skid saves 40% space compared to RO+IX setups.
5️⃣ Energy Efficient - Consumes 30% less energy than distillation.
6️⃣ Zero Chemical Waste - Supports sustainable, zero-discharge operations.
7️⃣ Smart Monitoring - Real-time display for resistivity, pressure, and flow with automatic alarms.

Applications of RO EDI Plant

💊 Pharmaceutical & Biotech: USP-grade purified water for injection or formulation.

⚙️ Electronics & Semiconductor: Ultrapure rinse water for wafers and circuit boards.

🧪 Laboratories & Research: Consistent high-resistivity water for analysis and calibration.

🏭 Power & Chemical Plants: Boiler feedwater and demineralized process water.

🍶 Food & Beverage: Final rinsing and ingredient mixing water with zero impurities.

Case Study: 10T/H RO EDI System for Pharmaceutical Factory

A pharmaceutical company in Malaysia required ultrapure water for formulation and CIP cleaning.
Our team supplied a 10T/H RO EDI system with fully automatic PLC control and 316L stainless-steel piping.

• Feed TDS: 380 ppm → Product resistivity: 17.8 MΩ·cm
• Energy use: 0.42 kWh/m³
• Maintenance frequency reduced by 40%

Result: System uptime 99.5%, enabling 24/7 production with minimal chemical cost.

Company Technical Strength

At Xi'an Ink-blue Environmental Protection Technology Co., Ltd., we provide end-to-end EDI water solutions:

🌍 Engineering Team - Experienced engineers design customized EDI and RO systems based on your feed water report.
🏗️ On-site Installation - We offer overseas installation, commissioning, and operator training.
🏢 OEM & Branding - Tailored system layout and private-label production available for distributors.
📜 Certifications - ISO9001, CE, NSF, ASME certified systems ensure international compliance.
🚚 Stable Supply Chain - Over 90% on-time delivery rate and strong packaging for global shipment.
💬 Fast Response - Quotation in 12 hours, design drawings in 48 hours.

📧 Inquiry Email: sales@ink-blue.com

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