The diffusion dialysis sodium hydroxide recovery system is a high-efficiency resource recovery solution designed for treating spent alkaline solutions generated during the texturing process of crystalline silicon solar wafers.
By applying diffusion dialysis technology, the system enables efficient recovery of free alkali and removal of impurities from waste alkaline streams. The recovered sodium hydroxide can be blended and reused in the original process, forming a closed-loop operation.
Meanwhile, the residual liquid is properly treated and discharged in compliance with environmental standards, significantly reducing wastewater treatment costs while improving both environmental and economic performance.
The system operates based on diffusion dialysis driven by a concentration gradient. Small-molecule sodium hydroxide selectively migrates through an ion exchange membrane to the receiving side, achieving efficient alkali separation and recovery.
Silicates and macromolecular organic substances are effectively retained on the feed side due to their larger size or charge characteristics.
Through continuous operation, free alkali in the waste solution is efficiently recovered. The recovered alkali is then blended with fresh alkali and reused in the texturing process. The remaining solution is sent to the wastewater treatment system, where it is neutralized with acidic wastewater and further treated to meet discharge standards.
• High-efficiency alkali recovery: Approximately 80% of free alkali can be recovered from waste streams
• Excellent impurity removal: About 90% of silicates and macromolecular organics are effectively removed
• Closed-loop process: Recovered alkali is reused after blending, reducing fresh alkali consumption
• Lower treatment cost: Reduces wastewater load and operational expenses
• Stable and reliable operation: Suitable for continuous industrial production with simple operation
• Environmentally compliant discharge: Residual liquid meets discharge standards after treatment
• Polysilicon and photovoltaic industry: Recovery and purification of spent alkaline solutions from texturing processes
• High-alkalinity wastewater recycling: Enables sodium hydroxide reuse and reduces raw material consumption
• Silicon-containing wastewater treatment: Effective removal of silicates to improve system stability
• Fine chemical alkaline separation: Suitable for systems containing organics and inorganic salts
• Wastewater neutralization and emission reduction: Reduces alkaline wastewater discharge load
• Green manufacturing systems: Supports energy-saving and environmentally friendly production in the photovoltaic industry
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