印染反渗透（RO）浓水具有有机物含量高、碱度大、盐分复杂的特征，其主要无机盐组分为硫酸钠（Na₂SO₄）、碳酸钠（Na₂CO₃）及碳酸氢钠（NaHCO₃）的复合体系。针对现有硫酸钠回收技术成熟但高附加值碳酸钠资源化不足的现状，创新采用“超滤（UF）＋臭氧高级氧化（AOP）＋纳滤（NF）”集成工艺，重点突破复杂体系中碳酸钠的分离与回收。结果表明，“UF＋AOP”预处理段对色度与COD的去除率分别达到98.87%和88.91%，有效保障纳滤系统的稳定运行；通过加酸调节pH将CO₃^2-转化为HCO₃^-后，NF系统在1.6 MPa的运行压力下对SO₄^2-的截留率为93.42%，对HCO₃^-的截留率为16.78%，再通过加碱回调pH将HCO₃^-转化为CO₃^2-，实现Na₂SO₄与NaHCO₃分离。工艺验证表明，整套系统运行稳定可靠。该研究构建印染RO浓水中有价无机盐的选择性回收新方法，为纺织印染行业实现废水零排放与资源循环利用提供具有工程应用价值的解决方案，兼具显著的环境效益与经济效益。

The concentrated water from the reverse osmosis（RO） process in the dyeing and printing industry is characterized by high organic content，high alkalinity，and complex salt composition.The main inorganic salts in it are a complex system of sodium sulfate（Na₂SO₄），sodium carbonate（Na₂CO₃），and sodium bicarbonate（NaHCO₃）.In response to the current situation where the technology for recovering sodium sulfate was mature but the resource utilization of high⁃value sodium carbonate was insufficient，an integrated process of "ultrafiltration（UF）+advanced oxidation process（AOP） with ozone+nanofiltration（NF）" was innovatively used to focus on the separation and recovery of sodium carbonate from the complex system.The results showed that the "UF+AOP" pretreatment stage achieved a color removal rate of 98.87% and a COD removal rate of 88.91%，effectively ensuring the stable operation of the NF system.After adjusting the pH by adding acid to convert CO₃^2- to HCO₃^-，the NF system，operating at 1.6 MPa，it reached a rejection rate of 93.42% for SO₄^2- and 16.78% for HCO₃^-.By adjusting the pH with alkali to convert HCO₃^- back to CO₃^2-，the separation of Na₂SO₄ and NaHCO₃ was achieved.The process verification indicated that the entire system operated stably and reliably.This study had established a new method for the selective recovery of valuable inorganic salts from dyeing and printing RO concentrated water，providing a solution with engineering application value for the textile and dyeing industry to achieve zero wastewater discharge and resource recycling，with significant environmental and economic benefits.