School of Environment and Resources, Fuzhou University, 350116 Fuzhou, China.
Jiangsu DDBS Environmental Remediation Co., Ltd., 210012 Nanjing, China.
J Hazard Mater. 2021 Oct 5;419:126505. doi: 10.1016/j.jhazmat.2021.126505. Epub 2021 Jun 26.
Effective extraction of useful resources from high-salinity textile wastewater is a critical pathway for sustainable wastewater management. In this study, an integrated loose nanofiltration-electrodialysis process was explored for simultaneous recovery of dyes, NaCl and pure water from high-salinity textile wastewater, thus closing the material loop and minimizing waste emission. Specifically, a loose nanofiltration membrane (molecular weight cutoff of ~800 Da) was proposed to fractionate the dye and NaCl in the high-salinity textile wastewater. Through a nanofiltration-diafiltration unit, including a pre-concentration stage and a constant-volume diafiltration stage, the dye could be recovered from the high-salinity textile wastewater, being enriched at a factor of ~9.0, i.e., from 2.01 to 17.9 g·L with 98.4% purity. Assisted with the subsequent implementation of electrodialysis, the NaCl concentrate and pure water were effectively reclaimed from the salt-containing permeate coming from the loose nanofiltration-diafiltration. Simultaneously, the produced pure water was further recycled to the nanofiltration-diafiltration unit. This study shows the potential of the integration of loose nanofiltation-diafiltration with electrodialysis for sufficient resource extraction from high-salinity textile wastewater.
从高盐度纺织废水中有效提取有用资源是可持续废水管理的关键途径。在这项研究中，探索了一种集成的疏松纳滤-电渗析工艺，用于从高盐度纺织废水中同时回收染料、NaCl 和纯水，从而封闭物质循环并最小化废物排放。具体而言，提出了一种疏松纳滤膜（分子量截留约 800 Da）来分离高盐度纺织废水中的染料和 NaCl。通过纳滤-渗滤单元，包括预浓缩阶段和恒体积渗滤阶段，可从高盐度纺织废水中回收染料，浓缩倍数约为 9.0，即从 2.01 升至 17.9 g·L，纯度为 98.4%。随后进行电渗析，可从疏松纳滤-渗滤的含盐渗透物中有效回收 NaCl 浓缩液和纯水。同时，产生的纯水进一步循环到纳滤-渗滤单元。本研究表明，疏松纳滤-渗滤与电渗析集成从高盐度纺织废水中充分提取资源具有潜力。
