- Qingqingquan
- Shandong
- 20 days
- 300 units per month
PV manufacturing water treatment: RO+EDI systems achieve 92% reuse rate at 40% lower cost. Get your customized solution today.
Ultrapure Water Solutions for the Photovoltaic Industry: Reverse Osmosis Technology Helps Revolutionize N-Type Cells
Ⅰ. Demand for Ultrapure Water in the Photovoltaic Industry Explodes
1.1 Why does 120GW of new capacity require specialized water treatment?
• N-Type Cell Upgrade: TOPCon/HJT technology has increased water quality requirements (resistivity needs to be ≥18MΩ-cm)
• Wafer cleaning standards: TOC (Total Organic Carbon) <5ppb, particulate matter <100/ml
• Cost pressure: 150,000-200,000 tons/year of ultrapure water per GW capacity, traditional process costs are too high
1.2 Data Support:
• PV water treatment membrane market size of 320 million yuan in 2024, an increase of 18.3% (GGII data).
Ⅱ. Core technology: RO + EDI combination process
2.1 How to realize photovoltaic-grade ultrapure water?
1.Two-stage reverse osmosis:
• Removal rate >99%, reduce conductivity to <1μS/cm
2.Electrodeionization (EDI):
• No need for acid and alkali regeneration, stable resistivity ≥ 18MΩ-cm
3.Terminal fine treatment:
• UV sterilization + precision filtration to ensure that TOC meets the standard
Process comparison table:
| Indicator | RO+EDI Mixed Bed Ion Exchange | Traditional Ion Exchange |
|---|---|---|
| Resistivity | ≥18 MΩ·cm | 15-17 MΩ·cm |
| Running Cost | $0.11−$0.17 / ton | $0.21−$0.28 / ton |
| Environmental Friendliness | Zero acid and alkali wastewater | Acid and alkali regeneration required |
Ⅲ. Case study: Upgrading of the water system in a TOPCon battery factory
Practice of 90% water reuse in a photovoltaic faucet
1. Challenge:
• Wafer cleaning wastewater contains fluoride (200mg/L), particulate matter
• Raw water cost accounts for 3.2% of production cost
2. Solution:
• Customized 200m³/h RO+EDI system
• Concentrated water recycling for cooling tower make-up water
3. Results:
✅ 92% water recycling rate
✅ 40% reduction in water consumption per wafer
✅ TÜV certified (with water quality test report)
Ⅳ. Market Driven: Dual Dividends of Policy and Technology
Key Opportunities for a 500 Million Dollar Market by 2025
1. Capacity Expansion: China plans to add 120GW of new PV capacity by 2025
2. Technology iteration: N-type cells use 30% more water than PERC
3. Policy requirements:
• PV Manufacturing Industry Specification Conditions require water reuse rate of ≥85%
Ⅴ. Equipment selection guide
3 photovoltaic ultrapure water system core indicators
1 .Modular design:
• Support flexible expansion from 1m³/h to 500m³/h
2. Intelligent monitoring:
• Real-time display of resistivity/TOC/particulate matter data
3. Material certification:
• 316L stainless steel piping to avoid metal ion contamination
Ⅵ. Call to Action (CTA)
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