An integrated ultrafiltration (UF) + two-pass reverse osmosis (RO) + water softening + MVR evaporation and crystallization solution for high-salinity industrial silicon wastewater, achieving water recycling and Zero Liquid Discharge (ZLD) for large-scale photovoltaic manufacturing.
Technical Specifications
This project was implemented for a large photovoltaic manufacturing complex in Qinghai Province, China, providing a customized wastewater treatment and Zero Liquid Discharge (ZLD) solution for industrial silicon production.
The system is designed to treat 15 m³/h of high-salinity wastewater generated from the reverse osmosis (RO) system while enabling complete wastewater recycling throughout the manufacturing process.
Standard Treatment Process
Ultrafiltration (UF) → Primary Reverse Osmosis (RO) → Secondary Reverse Osmosis (RO) → Water Softening → Mechanical Vapor Recompression (MVR) Evaporation & Crystallization → Water Reuse
System Capacity
- Evaporation Capacity: 15 m³/h
- Total Wastewater Treatment Capacity: 60 m³/h
Design Standard
Designed to comply with local environmental discharge regulations while achieving Zero Liquid Discharge (ZLD).
System Features
- Advanced MVR evaporation and crystallization technology
- High-efficiency treatment of high-salinity industrial wastewater
- Stable and reliable continuous operation
- Low overall energy consumption
- Optimized operating costs
- High water recovery efficiency
- Complete wastewater recycling
- Fully integrated engineering solution
- Suitable for large-scale photovoltaic and silicon manufacturing facilities
Applications
This wastewater treatment system is designed for:
- Industrial silicon manufacturing
- Polysilicon production
- Monocrystalline silicon manufacturing
- Wafer production
- Solar cell manufacturing
- Photovoltaic module production
- Semiconductor materials manufacturing
- Other industries generating high-salinity industrial wastewater
The solution is particularly suitable for industrial facilities seeking:
- Zero Liquid Discharge (ZLD)
- High water recovery rates
- High-salinity wastewater treatment
- Sustainable water management
- Environmental compliance
- Industrial water recycling
MVR Evaporation System for a 300,000 TPA Industrial Silicon Production Project
Customer Profile
The customer is one of the world's leading photovoltaic module manufacturers and integrated smart energy solution providers, with business operations covering photovoltaic products, PV systems, and smart energy solutions.
The company operates across the entire photovoltaic value chain, delivering comprehensive renewable energy solutions for the global clean energy market.
The project includes production lines for:
- 300,000 tons of industrial silicon
- 150,000 tons of high-purity polysilicon
- 35 GW of monocrystalline silicon
- 10 GW of silicon wafers
- 10 GW of solar cells
- 10 GW of photovoltaic modules
- 15 GW of module auxiliary materials
The total project investment exceeds RMB 50 billion.
Engineering Scope
Baihuipu was responsible for delivering the complete wastewater treatment system under a comprehensive EPC scope, including:
- Process engineering and system design
- Equipment procurement and manufacturing
- International logistics and customs clearance
- Equipment installation
- Commissioning and performance testing
- Trial operation
- Final project acceptance
- Technical training
- After-sales technical support
The project covered the complete implementation cycle, from engineering design and steel structure construction to equipment installation and system commissioning.
To ensure successful project delivery, Baihuipu established a standardized project management system featuring comprehensive quality control, process supervision, schedule management, safety management, full traceability, and visual project monitoring throughout every stage of implementation.
Wastewater Characteristics
The industrial silicon production process generates significant quantities of high-salinity wastewater, primarily consisting of concentrated RO reject water.
Typical wastewater characteristics include:
- Electrical conductivity exceeding 12,000 μS/cm
- High concentrations of dissolved salts
- Continuous industrial discharge
- Complex process wastewater from multiple production units and auxiliary facilities
Following treatment, the reclaimed water is fully reused within the production process.
Process Description
Municipal water supplied to the production facility is first treated using ultrafiltration (UF) followed by reverse osmosis (RO) to produce high-quality process water for industrial silicon manufacturing.
The concentrate generated by the primary RO system is further treated through:
- Secondary Reverse Osmosis (RO)
- Water Softening
- Mechanical Vapor Recompression (MVR) Evaporation & Crystallization
Recovered water from the MVR system is recycled back into the UF and RO purification process and reused throughout the manufacturing facility.
This closed-loop process enables complete water recycling while eliminating liquid wastewater discharge, fully meeting the project's Zero Liquid Discharge (ZLD) objectives.
Project Results
Following project completion, the facility achieved:
- 100% industrial wastewater recycling
- Total wastewater treatment capacity of 60 m³/h
- MVR evaporation capacity of 15 m³/h
- Significant reduction in freshwater consumption
- Reliable Zero Liquid Discharge (ZLD) operation
- Stable compliance with local environmental regulations
The project provides critical environmental infrastructure supporting the development of a world-class silicon manufacturing cluster in Qinghai Province.
Project Value
This project demonstrates Baihuipu's capability to deliver complete industrial wastewater treatment and Zero Liquid Discharge solutions for large-scale photovoltaic and semiconductor manufacturing facilities.
Leveraging nearly two decades of experience in industrial water treatment, Baihuipu combines advanced engineering design, proprietary process technologies, and professional project management to solve complex wastewater treatment challenges across the global new energy industry.
The successful implementation of this MVR evaporation project further strengthens Baihuipu's position as a trusted provider of comprehensive industrial water treatment, wastewater recycling, and Zero Liquid Discharge solutions for photovoltaic, semiconductor, and advanced materials manufacturing worldwide.
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