Two-Stage RO and EDI System

Optimized Typical Process Flow

Raw Water → Raw Water Tank (304 Stainless Steel, with Level Interlock Control) → Booster Pump (Grundfos CR Series) → Multimedia Filtration → Activated Carbon Adsorption → Water Softening → Precision Filter (5 μm PP Cartridge) → High-Pressure Pump (Multistage Centrifugal) → RO Membrane Rack → Pure Water Tank → UV Sterilization → EDI (Electrodeionization) for Deep Desalination → 18.2 MΩ·cm Ultra-Pure Water

Industry Application Examples

Aerospace Sector
The International Space Station utilizes RO technology to achieve an 85% urine recovery rate, saving approximately CNY 320,000 per ton of water daily.

Electronics Industry
A semiconductor manufacturing plant implemented a two-stage RO + EDI system, producing 18.2 MΩ·cm resistivity ultra-pure water, resulting in a 2.3% increase in wafer yield.

Medical Field
Dialysis water treated via RO achieves an endotoxin level of <0.03 EU/mL, fully compliant with YY0572-2015 standards.

Key Points for Operation & Maintenance

1. Fouling Index Control

   • SDI15 must be consistently <3

   • Membrane flux should be maintained at 22–28 GFD (for standard water sources)

2. Chemical Cleaning Protocols

   • pH 2 Citric Acid for inorganic scale removal

   • pH 12 Sodium Hypochlorite + EDTA for biofilm removal