- Qingqingquan
- Shandong
- 20 days
- 300 units per month
RO+ED systems reduce high-salinity water treatment costs by 50% vs evaporation. Get customized solutions for your plant. Request free assessment.
Zero Discharge Solution for High Salt Wastewater with Reverse Osmosis Technology
I. Market demand for high-salt wastewater treatment
1. Why do coal chemical industry and iron and steel industry need reverse osmosis?
• Policy driver: Inner Mongolia, Xinjiang and other places to strictly control the discharge of high-salt wastewater, requiring reuse rate of ≥ 90%
• Cost pressure: traditional evaporation crystallization process tons of water costs up to $2.09–2.79, reverse osmosis can be reduced to $0.70–1.11
• Industry pain points: Cl-, SO₄² - corrosion equipment, membrane contamination serious
2. Data support:
• China's coal chemical high salt wastewater treatment market size in 2025 will reach ¥ 1.2 billion (annual growth of 18%).
II. Core technology: anti-pollution RO + electrodialysis
How to achieve 95% reuse rate?
1. Segmented RO design:
• First-stage RO recovery rate of 60%, second-stage DTRO treatment of concentrated water
• Anti-pollution polyamide membrane, Cl- corrosion resistance (>50,000mg/L)
2. Electrodialysis (ED) fine treatment:
• Further concentrates salts to 15% for crystallization recovery
• Intelligent Cleaning System:
• Online monitoring of fouling, automated chemical cleaning (failure rate <2%)
3. Process comparison table:
| Indicator | RO+ED | Evaporation Crystallization |
|---|---|---|
| Cost of ton of water ($) | $0.70–1.11 | $2.09–2.79 |
| Energy consumption | 8–10 kWh/ton | 50–70 kWh/ton |
| Recovery rate | 90–95% | 70–80% |
III. Case: Coal chemical industry enterprises to save 5 million per year
Zero-discharge practice of a project in Inner Mongolia
1. Raw water quality:
• TDS 80,000mg/L, Cl- 25,000mg/L
2. Solution:
• 200m³/h RO+ED system
• Concentrated brine to make industrial salt (NaCl purity >98%)
3. Achievements:
✅ 95% reuse rate, annual water savings of 3.6 million tons
✅ Reduce sewage charges ￥5 million/year
✅ By-product salt income ￥2 million/year
IV. Industry Application Expansion
Successful cases of iron and steel/waste leachate
1. Steel pickling wastewater:
• RO to remove Fe²⁺/H⁺, reuse for acid regeneration
2. Waste leachate:
• Combined process to treat wastewater with COD>20,000mg/L
Get your zero discharge solution
