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Research on efficient separation and reuse of sodium carbonate and sodium sulfate in printing and dyeing wastewater based on nanofiltration technology

Authors： LI Zhonghua1, CHANG Na2, CHEN Donggen3, XIE Houpeng3, LIU Peng3, WANG Haitao1

Units： 1. School of Environmental Science and Engineering, Tiangong University, Tianjin 300387, China; 2. School of Chemical Engineering and Technology, Tiangong University, Tianjin 300387, China; 3. Zhejiang Jinmo Environmental Technology Co., Ltd., Shaoxing 312000, China

KeyWords： nanofiltration; salt separation; sodium carbonate; sodium sulfate; reuse dyed cloth

ClassificationCode：TQ028

year,volume(issue):pagination： 2025,45(1):129-136

Abstract：

The existence of high salinity in printing and dyeing wastewater requires the recycling of water and inorganic salt resources. Among them, the main salt compositions are sodium carbonate and sodium sulfate. In the conventional wastewater treatment process, the recovery of sodium sulfate is highly valued, while the recovery of sodium carbonate with high economic value is neglected. In this study, based on nanofiltration technology, the separation experiment of sodium carbonate and sodium sulfate was carried out for mixed salt solution and actual printing and dyeing wastewater. The conversion of CO2-3 and HCO-3 is realized by pH adjustment, and the separation of HCO-3 and SO2-4 is realized by nanofiltration process, and then the solid salt obtained by evaporation is reused in the dyeing process. The results show that when the pH value of the solution is 8.1, the conversion rate of CO2-3 to HCO-3 is the highest, which is beneficial to nanofiltration. The small influent pressure is more conducive to the separation and recovery of HCO-3. The effect of salt separation in the pilot test of mixed salt solution is obvious. SO2-4 is efficiently intercepted, and HCO-3 shows a negative interception state. In the salt separation test of printing and dyeing wastewater, the rejection rate of nanofiltration device to SO2-4 can reach 97.58%, the rejection rate of HCO-3 can reach-57.07%, and the separation degree can reach 220. The salt separation effect is remarkable. The obtained solid sodium carbonate and sodium sulfate were reused to dye the cloth, and the color difference of the dyed cloth was less than 1.Nanofiltration membrane technology shows feasibility in the treatment of printing and dyeing wastewater and salt resource recovery, but further optimization and in-depth exploration of process operation parameters are still needed.

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Funds：

山东省重点研发计划项目（2022CXGC020416）；兵团科技计划项目（2023AB043）；浙江省重点研发计划项目（2024C03133）

AuthorIntro：

李忠华（1998-），男，内蒙古呼伦贝尔人，硕士研究生，主要研究方向为印染废水成分分析、工业废水处理.

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